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====================================
Injecting the administrator password
====================================
Compute can generate a random administrator (root) password and inject that
password into an instance. If this feature is enabled, users can run
:command:`ssh` to an instance without an :command:`ssh` keypair. The random
password appears in the output of the :command:`openstack server create`
command. You can also view and set the admin password from the dashboard.
.. rubric:: Password injection using the dashboard
By default, the dashboard will display the ``admin`` password and allow the
user to modify it.
If you do not want to support password injection, disable the password fields
by editing the dashboard's ``local_settings.py`` file.
.. code-block:: none
OPENSTACK_HYPERVISOR_FEATURES = {
...
'can_set_password': False,
}
.. rubric:: Password injection on libvirt-based hypervisors
For hypervisors that use the libvirt back end (such as KVM, QEMU, and LXC),
admin password injection is disabled by default. To enable it, set this option
in ``/etc/nova/nova.conf``:
.. code-block:: ini
[libvirt]
inject_password=true
When enabled, Compute will modify the password of the admin account by editing
the ``/etc/shadow`` file inside the virtual machine instance.
.. note::
Users can only use :command:`ssh` to access the instance by using the admin
password if the virtual machine image is a Linux distribution, and it has
been configured to allow users to use :command:`ssh` as the root user. This
is not the case for `Ubuntu cloud images <http://uec-images.ubuntu.com>`_
which, by default, does not allow users to use :command:`ssh` to access the
root account.
.. rubric:: Password injection and XenAPI (XenServer/XCP)
When using the XenAPI hypervisor back end, Compute uses the XenAPI agent to
inject passwords into guests. The virtual machine image must be configured with
the agent for password injection to work.
.. rubric:: Password injection and Windows images (all hypervisors)
For Windows virtual machines, configure the Windows image to retrieve the admin
password on boot by installing an agent such as `cloudbase-init
<https://cloudbase.it/cloudbase-init>`_.

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======================
Advanced configuration
======================
OpenStack clouds run on platforms that differ greatly in the capabilities that
they provide. By default, the Compute service seeks to abstract the underlying
hardware that it runs on, rather than exposing specifics about the underlying
host platforms. This abstraction manifests itself in many ways. For example,
rather than exposing the types and topologies of CPUs running on hosts, the
service exposes a number of generic CPUs (virtual CPUs, or vCPUs) and allows
for overcommitting of these. In a similar manner, rather than exposing the
individual types of network devices available on hosts, generic
software-powered network ports are provided. These features are designed to
allow high resource utilization and allows the service to provide a generic
cost-effective and highly scalable cloud upon which to build applications.
This abstraction is beneficial for most workloads. However, there are some
workloads where determinism and per-instance performance are important, if not
vital. In these cases, instances can be expected to deliver near-native
performance. The Compute service provides features to improve individual
instance for these kind of workloads.
.. toctree::
:maxdepth: 2
pci-passthrough
cpu-topologies
huge-pages

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===================
System architecture
===================
OpenStack Compute contains several main components.
- The cloud controller represents the global state and interacts with the
other components. The ``API server`` acts as the web services front end for
the cloud controller. The ``compute controller`` provides compute server
resources and usually also contains the Compute service.
- The ``object store`` is an optional component that provides storage
services; you can also use OpenStack Object Storage instead.
- An ``auth manager`` provides authentication and authorization services when
used with the Compute system; you can also use OpenStack Identity as a
separate authentication service instead.
- A ``volume controller`` provides fast and permanent block-level storage for
the compute servers.
- The ``network controller`` provides virtual networks to enable compute
servers to interact with each other and with the public network. You can also
use OpenStack Networking instead.
- The ``scheduler`` is used to select the most suitable compute controller to
host an instance.
Compute uses a messaging-based, ``shared nothing`` architecture. All major
components exist on multiple servers, including the compute, volume, and
network controllers, and the Object Storage or Image service. The state of the
entire system is stored in a database. The cloud controller communicates with
the internal object store using HTTP, but it communicates with the scheduler,
network controller, and volume controller using Advanced Message Queuing
Protocol (AMQP). To avoid blocking a component while waiting for a response,
Compute uses asynchronous calls, with a callback that is triggered when a
response is received.
Hypervisors
~~~~~~~~~~~
Compute controls hypervisors through an API server. Selecting the best
hypervisor to use can be difficult, and you must take budget, resource
constraints, supported features, and required technical specifications into
account. However, the majority of OpenStack development is done on systems
using KVM and Xen-based hypervisors. For a detailed list of features and
support across different hypervisors, see the `Feature Support Matrix
<https://docs.openstack.org/developer/nova/support-matrix.html>`_.
You can also orchestrate clouds using multiple hypervisors in different
availability zones. Compute supports the following hypervisors:
- `Baremetal <https://wiki.openstack.org/wiki/Ironic>`__
- `Docker <https://www.docker.io>`__
- `Hyper-V
<http://www.microsoft.com/en-us/server-cloud/hyper-v-server/default.aspx>`__
- `Kernel-based Virtual Machine (KVM)
<http://www.linux-kvm.org/page/Main_Page>`__
- `Linux Containers (LXC) <https://linuxcontainers.org/>`__
- `Quick Emulator (QEMU) <http://wiki.qemu.org/Manual>`__
- `User Mode Linux (UML) <http://user-mode-linux.sourceforge.net/>`__
- `VMware vSphere
<http://www.vmware.com/products/vsphere-hypervisor/support.html>`__
- `Xen <http://www.xen.org/support/documentation.html>`__
For more information about hypervisors, see the `Hypervisors
<https://docs.openstack.org/ocata/config-reference/compute/hypervisors.html>`__
section in the OpenStack Configuration Reference.
Projects, users, and roles
~~~~~~~~~~~~~~~~~~~~~~~~~~
The Compute system is designed to be used by different consumers in the form of
projects on a shared system, and role-based access assignments. Roles control
the actions that a user is allowed to perform.
Projects are isolated resource containers that form the principal
organizational structure within the Compute service. They consist of an
individual VLAN, and volumes, instances, images, keys, and users. A user can
specify the project by appending ``project_id`` to their access key. If no
project is specified in the API request, Compute attempts to use a project with
the same ID as the user.
For projects, you can use quota controls to limit the:
- Number of volumes that can be launched.
- Number of processor cores and the amount of RAM that can be allocated.
- Floating IP addresses assigned to any instance when it launches. This allows
instances to have the same publicly accessible IP addresses.
- Fixed IP addresses assigned to the same instance when it launches. This
allows instances to have the same publicly or privately accessible IP
addresses.
Roles control the actions a user is allowed to perform. By default, most
actions do not require a particular role, but you can configure them by editing
the ``policy.json`` file for user roles. For example, a rule can be defined so
that a user must have the ``admin`` role in order to be able to allocate a
public IP address.
A project limits users' access to particular images. Each user is assigned a
user name and password. Keypairs granting access to an instance are enabled for
each user, but quotas are set, so that each project can control resource
consumption across available hardware resources.
.. note::
Earlier versions of OpenStack used the term ``tenant`` instead of
``project``. Because of this legacy terminology, some command-line tools use
``--tenant_id`` where you would normally expect to enter a project ID.
Block storage
~~~~~~~~~~~~~
OpenStack provides two classes of block storage: ephemeral storage and
persistent volume.
.. rubric:: Ephemeral storage
Ephemeral storage includes a root ephemeral volume and an additional ephemeral
volume.
The root disk is associated with an instance, and exists only for the life of
this very instance. Generally, it is used to store an instance's root file
system, persists across the guest operating system reboots, and is removed on
an instance deletion. The amount of the root ephemeral volume is defined by the
flavor of an instance.
In addition to the ephemeral root volume, all default types of flavors, except
``m1.tiny``, which is the smallest one, provide an additional ephemeral block
device sized between 20 and 160 GB (a configurable value to suit an
environment). It is represented as a raw block device with no partition table
or file system. A cloud-aware operating system can discover, format, and mount
such a storage device. OpenStack Compute defines the default file system for
different operating systems as Ext4 for Linux distributions, VFAT for non-Linux
and non-Windows operating systems, and NTFS for Windows. However, it is
possible to specify any other filesystem type by using ``virt_mkfs`` or
``default_ephemeral_format`` configuration options.
.. note::
For example, the ``cloud-init`` package included into an Ubuntu's stock
cloud image, by default, formats this space as an Ext4 file system and
mounts it on ``/mnt``. This is a cloud-init feature, and is not an OpenStack
mechanism. OpenStack only provisions the raw storage.
.. rubric:: Persistent volume
A persistent volume is represented by a persistent virtualized block device
independent of any particular instance, and provided by OpenStack Block
Storage.
Only a single configured instance can access a persistent volume. Multiple
instances cannot access a persistent volume. This type of configuration
requires a traditional network file system to allow multiple instances
accessing the persistent volume. It also requires a traditional network file
system like NFS, CIFS, or a cluster file system such as GlusterFS. These
systems can be built within an OpenStack cluster, or provisioned outside of it,
but OpenStack software does not provide these features.
You can configure a persistent volume as bootable and use it to provide a
persistent virtual instance similar to the traditional non-cloud-based
virtualization system. It is still possible for the resulting instance to keep
ephemeral storage, depending on the flavor selected. In this case, the root
file system can be on the persistent volume, and its state is maintained, even
if the instance is shut down. For more information about this type of
configuration, see `Introduction to the Block Storage service
<https://docs.openstack.org/ocata/config-reference/block-storage/block-storage-overview.html>`_
in the OpenStack Configuration Reference.
.. note::
A persistent volume does not provide concurrent access from multiple
instances. That type of configuration requires a traditional network file
system like NFS, or CIFS, or a cluster file system such as GlusterFS. These
systems can be built within an OpenStack cluster, or provisioned outside of
it, but OpenStack software does not provide these features.
EC2 compatibility API
~~~~~~~~~~~~~~~~~~~~~
.. todo:: Does this need to be removed now?
In addition to the native compute API, OpenStack provides an EC2-compatible
API. This API allows EC2 legacy workflows built for EC2 to work with OpenStack.
.. warning::
Nova in tree EC2-compatible API is deprecated. The `ec2-api project
<https://git.openstack.org/cgit/openstack/ec2-api/>`_ is working to
implement the EC2 API.
You can use numerous third-party tools and language-specific SDKs to interact
with OpenStack clouds. You can use both native and compatibility APIs. Some of
the more popular third-party tools are:
Euca2ools
A popular open source command-line tool for interacting with the EC2 API.
This is convenient for multi-cloud environments where EC2 is the common API,
or for transitioning from EC2-based clouds to OpenStack. For more
information, see the `Eucalyptus Documentation
<http://docs.hpcloud.com/eucalyptus>`__.
Hybridfox
A Firefox browser add-on that provides a graphical interface to many popular
public and private cloud technologies, including OpenStack. For more
information, see the `hybridfox site
<http://code.google.com/p/hybridfox/>`__.
boto
Python library for interacting with Amazon Web Services. You can use this
library to access OpenStack through the EC2 compatibility API. For more
information, see the `boto project page on GitHub
<https://github.com/boto/boto>`__.
fog
A Ruby cloud services library. It provides methods to interact with a large
number of cloud and virtualization platforms, including OpenStack. For more
information, see the `fog site <https://rubygems.org/gems/fog>`__.
php-opencloud
A PHP SDK designed to work with most OpenStack-based cloud deployments, as
well as Rackspace public cloud. For more information, see the `php-opencloud
site <http://www.php-opencloud.com>`__.
Building blocks
~~~~~~~~~~~~~~~
In OpenStack the base operating system is usually copied from an image stored
in the OpenStack Image service. This is the most common case and results in an
ephemeral instance that starts from a known template state and loses all
accumulated states on virtual machine deletion. It is also possible to put an
operating system on a persistent volume in the OpenStack Block Storage volume
system. This gives a more traditional persistent system that accumulates states
which are preserved on the OpenStack Block Storage volume across the deletion
and re-creation of the virtual machine. To get a list of available images on
your system, run:
.. code-block:: console
$ openstack image list
+--------------------------------------+-----------------------------+--------+
| ID | Name | Status |
+--------------------------------------+-----------------------------+--------+
| aee1d242-730f-431f-88c1-87630c0f07ba | Ubuntu 14.04 cloudimg amd64 | active |
| 0b27baa1-0ca6-49a7-b3f4-48388e440245 | Ubuntu 14.10 cloudimg amd64 | active |
| df8d56fc-9cea-4dfd-a8d3-28764de3cb08 | jenkins | active |
+--------------------------------------+-----------------------------+--------+
The displayed image attributes are:
``ID``
Automatically generated UUID of the image
``Name``
Free form, human-readable name for image
``Status``
The status of the image. Images marked ``ACTIVE`` are available for use.
``Server``
For images that are created as snapshots of running instances, this is the
UUID of the instance the snapshot derives from. For uploaded images, this
field is blank.
Virtual hardware templates are called ``flavors``. By default, these are
configurable by admin users, however that behavior can be changed by redefining
the access controls for ``compute_extension:flavormanage`` in
``/etc/nova/policy.json`` on the ``compute-api`` server.
For a list of flavors that are available on your system:
.. code-block:: console
$ openstack flavor list
+-----+-----------+-------+------+-----------+-------+-----------+
| ID | Name | RAM | Disk | Ephemeral | VCPUs | Is_Public |
+-----+-----------+-------+------+-----------+-------+-----------+
| 1 | m1.tiny | 512 | 1 | 0 | 1 | True |
| 2 | m1.small | 2048 | 20 | 0 | 1 | True |
| 3 | m1.medium | 4096 | 40 | 0 | 2 | True |
| 4 | m1.large | 8192 | 80 | 0 | 4 | True |
| 5 | m1.xlarge | 16384 | 160 | 0 | 8 | True |
+-----+-----------+-------+------+-----------+-------+-----------+
Compute service architecture
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
These basic categories describe the service architecture and information about
the cloud controller.
.. rubric:: API server
At the heart of the cloud framework is an API server, which makes command and
control of the hypervisor, storage, and networking programmatically available
to users.
The API endpoints are basic HTTP web services which handle authentication,
authorization, and basic command and control functions using various API
interfaces under the Amazon, Rackspace, and related models. This enables API
compatibility with multiple existing tool sets created for interaction with
offerings from other vendors. This broad compatibility prevents vendor lock-in.
.. rubric:: Message queue
A messaging queue brokers the interaction between compute nodes (processing),
the networking controllers (software which controls network infrastructure),
API endpoints, the scheduler (determines which physical hardware to allocate to
a virtual resource), and similar components. Communication to and from the
cloud controller is handled by HTTP requests through multiple API endpoints.
A typical message passing event begins with the API server receiving a request
from a user. The API server authenticates the user and ensures that they are
permitted to issue the subject command. The availability of objects implicated
in the request is evaluated and, if available, the request is routed to the
queuing engine for the relevant workers. Workers continually listen to the
queue based on their role, and occasionally their type host name. When an
applicable work request arrives on the queue, the worker takes assignment of
the task and begins executing it. Upon completion, a response is dispatched to
the queue which is received by the API server and relayed to the originating
user. Database entries are queried, added, or removed as necessary during the
process.
.. rubric:: Compute worker
Compute workers manage computing instances on host machines. The API dispatches
commands to compute workers to complete these tasks:
- Run instances
- Delete instances (Terminate instances)
- Reboot instances
- Attach volumes
- Detach volumes
- Get console output
.. rubric:: Network Controller
The Network Controller manages the networking resources on host machines. The
API server dispatches commands through the message queue, which are
subsequently processed by Network Controllers. Specific operations include:
- Allocating fixed IP addresses
- Configuring VLANs for projects
- Configuring networks for compute nodes

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=============================================
Show usage statistics for hosts and instances
=============================================
You can show basic statistics on resource usage for hosts and instances.
.. note::
For more sophisticated monitoring, see the
`ceilometer <https://launchpad.net/ceilometer>`__ project. You can
also use tools, such as `Ganglia <http://ganglia.info/>`__ or
`Graphite <http://graphite.wikidot.com/>`__, to gather more detailed
data.
Show host usage statistics
~~~~~~~~~~~~~~~~~~~~~~~~~~
The following examples show the host usage statistics for a host called
``devstack``.
* List the hosts and the nova-related services that run on them:
.. code-block:: console
$ openstack host list
+-----------+-------------+----------+
| Host Name | Service | Zone |
+-----------+-------------+----------+
| devstack | conductor | internal |
| devstack | compute | nova |
| devstack | cert | internal |
| devstack | network | internal |
| devstack | scheduler | internal |
| devstack | consoleauth | internal |
+-----------+-------------+----------+
* Get a summary of resource usage of all of the instances running on the host:
.. code-block:: console
$ openstack host show devstack
+----------+----------------------------------+-----+-----------+---------+
| Host | Project | CPU | MEMORY MB | DISK GB |
+----------+----------------------------------+-----+-----------+---------+
| devstack | (total) | 2 | 4003 | 157 |
| devstack | (used_now) | 3 | 5120 | 40 |
| devstack | (used_max) | 3 | 4608 | 40 |
| devstack | b70d90d65e464582b6b2161cf3603ced | 1 | 512 | 0 |
| devstack | 66265572db174a7aa66eba661f58eb9e | 2 | 4096 | 40 |
+----------+----------------------------------+-----+-----------+---------+
The ``CPU`` column shows the sum of the virtual CPUs for instances running on
the host.
The ``MEMORY MB`` column shows the sum of the memory (in MB) allocated to the
instances that run on the host.
The ``DISK GB`` column shows the sum of the root and ephemeral disk sizes (in
GB) of the instances that run on the host.
The row that has the value ``used_now`` in the ``PROJECT`` column shows the
sum of the resources allocated to the instances that run on the host, plus
the resources allocated to the virtual machine of the host itself.
The row that has the value ``used_max`` in the ``PROJECT`` column shows the
sum of the resources allocated to the instances that run on the host.
.. note::
These values are computed by using information about the flavors of the
instances that run on the hosts. This command does not query the CPU
usage, memory usage, or hard disk usage of the physical host.
Show instance usage statistics
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Get CPU, memory, I/O, and network statistics for an instance.
#. List instances:
.. code-block:: console
$ openstack server list
+----------+----------------------+--------+------------+-------------+------------------+------------+
| ID | Name | Status | Task State | Power State | Networks | Image Name |
+----------+----------------------+--------+------------+-------------+------------------+------------+
| 84c6e... | myCirrosServer | ACTIVE | None | Running | private=10.0.0.3 | cirros |
| 8a995... | myInstanceFromVolume | ACTIVE | None | Running | private=10.0.0.4 | ubuntu |
+----------+----------------------+--------+------------+-------------+------------------+------------+
#. Get diagnostic statistics:
.. code-block:: console
$ nova diagnostics myCirrosServer
+---------------------------+--------+
| Property | Value |
+---------------------------+--------+
| memory | 524288 |
| memory-actual | 524288 |
| memory-rss | 6444 |
| tap1fec8fb8-7a_rx | 22137 |
| tap1fec8fb8-7a_rx_drop | 0 |
| tap1fec8fb8-7a_rx_errors | 0 |
| tap1fec8fb8-7a_rx_packets | 166 |
| tap1fec8fb8-7a_tx | 18032 |
| tap1fec8fb8-7a_tx_drop | 0 |
| tap1fec8fb8-7a_tx_errors | 0 |
| tap1fec8fb8-7a_tx_packets | 130 |
| vda_errors | -1 |
| vda_read | 2048 |
| vda_read_req | 2 |
| vda_write | 182272 |
| vda_write_req | 74 |
+---------------------------+--------+
* Get summary statistics for each project:
.. code-block:: console
$ openstack usage list
Usage from 2013-06-25 to 2013-07-24:
+---------+---------+--------------+-----------+---------------+
| Project | Servers | RAM MB-Hours | CPU Hours | Disk GB-Hours |
+---------+---------+--------------+-----------+---------------+
| demo | 1 | 344064.44 | 672.00 | 0.00 |
| stack | 3 | 671626.76 | 327.94 | 6558.86 |
+---------+---------+--------------+-----------+---------------+

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.. _section_configuring-compute-migrations:
=========================
Configure live migrations
=========================
Migration enables an administrator to move a virtual machine instance from one
compute host to another. A typical scenario is planned maintenance on the
source host, but migration can also be useful to redistribute the load when
many VM instances are running on a specific physical machine.
This document covers live migrations using the
:ref:`configuring-migrations-kvm-libvirt` and
:ref:`configuring-migrations-xenserver` hypervisors.
.. :ref:`_configuring-migrations-kvm-libvirt`
.. :ref:`_configuring-migrations-xenserver`
.. note::
Not all Compute service hypervisor drivers support live-migration, or
support all live-migration features.
Consult the `Hypervisor Support Matrix
<https://docs.openstack.org/developer/nova/support-matrix.html>`_ to
determine which hypervisors support live-migration.
See the `Hypervisor configuration pages
<https://docs.openstack.org/ocata/config-reference/compute/hypervisors.html>`_
for details on hypervisor-specific configuration settings.
The migration types are:
- **Non-live migration**, also known as cold migration or simply migration.
The instance is shut down, then moved to another hypervisor and restarted.
The instance recognizes that it was rebooted, and the application running on
the instance is disrupted.
This section does not cover cold migration.
- **Live migration**
The instance keeps running throughout the migration. This is useful when it
is not possible or desirable to stop the application running on the instance.
Live migrations can be classified further by the way they treat instance
storage:
- **Shared storage-based live migration**. The instance has ephemeral disks
that are located on storage shared between the source and destination
hosts.
- **Block live migration**, or simply block migration. The instance has
ephemeral disks that are not shared between the source and destination
hosts. Block migration is incompatible with read-only devices such as
CD-ROMs and `Configuration Drive (config\_drive)
<https://docs.openstack.org/user-guide/cli-config-drive.html>`_.
- **Volume-backed live migration**. Instances use volumes rather than
ephemeral disks.
Block live migration requires copying disks from the source to the
destination host. It takes more time and puts more load on the network.
Shared-storage and volume-backed live migration does not copy disks.
.. note::
In a multi-cell cloud, instances can be live migrated to a
different host in the same cell, but not across cells.
The following sections describe how to configure your hosts for live migrations
using the KVM and XenServer hypervisors.
.. _configuring-migrations-kvm-libvirt:
KVM-libvirt
~~~~~~~~~~~
.. :ref:`_configuring-migrations-kvm-general`
.. :ref:`_configuring-migrations-kvm-block-and-volume-migration`
.. :ref:`_configuring-migrations-kvm-shared-storage`
.. _configuring-migrations-kvm-general:
General configuration
---------------------
To enable any type of live migration, configure the compute hosts according to
the instructions below:
#. Set the following parameters in ``nova.conf`` on all compute hosts:
- ``vncserver_listen=0.0.0.0``
You must not make the VNC server listen to the IP address of its compute
host, since that addresses changes when the instance is migrated.
.. important::
Since this setting allows VNC clients from any IP address to connect to
instance consoles, you must take additional measures like secure
networks or firewalls to prevent potential attackers from gaining
access to instances.
- ``instances_path`` must have the same value for all compute hosts. In
this guide, the value ``/var/lib/nova/instances`` is assumed.
#. Ensure that name resolution on all compute hosts is identical, so that they
can connect each other through their hostnames.
If you use ``/etc/hosts`` for name resolution and enable SELinux, ensure
that ``/etc/hosts`` has the correct SELinux context:
.. code-block:: console
# restorecon /etc/hosts
#. Enable password-less SSH so that root on one compute host can log on to any
other compute host without providing a password. The ``libvirtd`` daemon,
which runs as root, uses the SSH protocol to copy the instance to the
destination and can't know the passwords of all compute hosts.
You may, for example, compile root's public SSH keys on all compute hosts
into an ``authorized_keys`` file and deploy that file to the compute hosts.
#. Configure the firewalls to allow libvirt to communicate between compute
hosts.
By default, libvirt uses the TCP port range from 49152 to 49261 for copying
memory and disk contents. Compute hosts must accept connections in this
range.
For information about ports used by libvirt, see the `libvirt documentation
<http://libvirt.org/remote.html#Remote_libvirtd_configuration>`_.
.. important::
Be mindful of the security risks introduced by opening ports.
.. _configuring-migrations-kvm-block-and-volume-migration:
Block migration, volume-based live migration
--------------------------------------------
No additional configuration is required for block migration and volume-backed
live migration.
Be aware that block migration adds load to the network and storage subsystems.
.. _configuring-migrations-kvm-shared-storage:
Shared storage
--------------
Compute hosts have many options for sharing storage, for example NFS, shared
disk array LUNs, Ceph or GlusterFS.
The next steps show how a regular Linux system might be configured as an NFS v4
server for live migration. For detailed information and alternative ways to
configure NFS on Linux, see instructions for `Ubuntu
<https://help.ubuntu.com/community/SettingUpNFSHowTo>`_, `RHEL and derivatives
<https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Storage_Administration_Guide/nfs-serverconfig.html>`_
or `SLES and OpenSUSE
<https://www.suse.com/documentation/sles-12/book_sle_admin/data/sec_nfs_configuring-nfs-server.html>`_.
#. Ensure that UID and GID of the nova user are identical on the compute hosts
and the NFS server.
#. Create a directory with enough disk space for all instances in the cloud,
owned by user nova. In this guide, we assume ``/var/lib/nova/instances``.
#. Set the execute/search bit on the ``instances`` directory:
.. code-block:: console
$ chmod o+x /var/lib/nova/instances
This allows qemu to access the ``instances`` directory tree.
#. Export ``/var/lib/nova/instances`` to the compute hosts. For example, add
the following line to ``/etc/exports``:
.. code-block:: ini
/var/lib/nova/instances *(rw,sync,fsid=0,no_root_squash)
The asterisk permits access to any NFS client. The option ``fsid=0`` exports
the instances directory as the NFS root.
After setting up the NFS server, mount the remote filesystem on all compute
hosts.
#. Assuming the NFS server's hostname is ``nfs-server``, add this line to
``/etc/fstab`` to mount the NFS root:
.. code-block:: console
nfs-server:/ /var/lib/nova/instances nfs4 defaults 0 0
#. Test NFS by mounting the instances directory and check access permissions
for the nova user:
.. code-block:: console
$ sudo mount -a -v
$ ls -ld /var/lib/nova/instances/
drwxr-xr-x. 2 nova nova 6 Mar 14 21:30 /var/lib/nova/instances/
.. _configuring-migrations-kvm-advanced:
Advanced configuration for KVM and QEMU
---------------------------------------
Live migration copies the instance's memory from the source to the destination
compute host. After a memory page has been copied, the instance may write to it
again, so that it has to be copied again. Instances that frequently write to
different memory pages can overwhelm the memory copy process and prevent the
live migration from completing.
This section covers configuration settings that can help live migration of
memory-intensive instances succeed.
#. **Live migration completion timeout**
The Compute service aborts a migration when it has been running for too
long. The timeout is calculated based on the instance size, which is the
instance's memory size in GiB. In the case of block migration, the size of
ephemeral storage in GiB is added.
The timeout in seconds is the instance size multiplied by the configurable
parameter ``live_migration_completion_timeout``, whose default is 800. For
example, shared-storage live migration of an instance with 8GiB memory will
time out after 6400 seconds.
#. **Live migration progress timeout**
The Compute service also aborts a live migration when it detects that memory
copy is not making progress for a certain time. You can set this time, in
seconds, through the configurable parameter
``live_migration_progress_timeout``.
In Ocata, the default value of ``live_migration_progress_timeout`` is 0,
which disables progress timeouts. You should not change this value, since
the algorithm that detects memory copy progress has been determined to be
unreliable. It may be re-enabled in future releases.
#. **Instance downtime**
Near the end of the memory copy, the instance is paused for a short time so
that the remaining few pages can be copied without interference from
instance memory writes. The Compute service initializes this time to a small
value that depends on the instance size, typically around 50 milliseconds.
When it notices that the memory copy does not make sufficient progress, it
increases the time gradually.
You can influence the instance downtime algorithm with the help of three
configuration variables on the compute hosts:
.. code-block:: ini
live_migration_downtime = 500
live_migration_downtime_steps = 10
live_migration_downtime_delay = 75
``live_migration_downtime`` sets the maximum permitted downtime for a live
migration, in *milliseconds*. The default is 500.
``live_migration_downtime_steps`` sets the total number of adjustment steps
until ``live_migration_downtime`` is reached. The default is 10 steps.
``live_migration_downtime_delay`` sets the time interval between two
adjustment steps in *seconds*. The default is 75.
#. **Auto-convergence**
One strategy for a successful live migration of a memory-intensive instance
is slowing the instance down. This is called auto-convergence. Both libvirt
and QEMU implement this feature by automatically throttling the instance's
CPU when memory copy delays are detected.
Auto-convergence is disabled by default. You can enable it by setting
``live_migration_permit_auto_convergence=true``.
.. caution::
Before enabling auto-convergence, make sure that the instance's
application tolerates a slow-down.
Be aware that auto-convergence does not guarantee live migration success.
#. **Post-copy**
Live migration of a memory-intensive instance is certain to succeed when you
enable post-copy. This feature, implemented by libvirt and QEMU, activates
the virtual machine on the destination host before all of its memory has
been copied. When the virtual machine accesses a page that is missing on
the destination host, the resulting page fault is resolved by copying the
page from the source host.
Post-copy is disabled by default. You can enable it by setting
``live_migration_permit_post_copy=true``.
When you enable both auto-convergence and post-copy, auto-convergence
remains disabled.
.. caution::
The page faults introduced by post-copy can slow the instance down.
When the network connection between source and destination host is
interrupted, page faults cannot be resolved anymore and the instance is
rebooted.
.. TODO Bernd: I *believe* that it is certain to succeed,
.. but perhaps I am missing something.
The full list of live migration configuration parameters is documented in the
`OpenStack Configuration Reference Guide
<https://docs.openstack.org/ocata/config-reference/compute/config-options.html>`_
.. _configuring-migrations-xenserver:
XenServer
~~~~~~~~~
.. :ref:Shared Storage
.. :ref:Block migration
.. _configuring-migrations-xenserver-shared-storage:
Shared storage
--------------
**Prerequisites**
- **Compatible XenServer hypervisors**.
For more information, see the `Requirements for Creating Resource Pools
<http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/reference.html#pooling_homogeneity_requirements>`_
section of the XenServer Administrator's Guide.
- **Shared storage**.
An NFS export, visible to all XenServer hosts.
.. note::
For the supported NFS versions, see the `NFS VHD
<http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/reference.html#id1002701>`_
section of the XenServer Administrator's Guide.
To use shared storage live migration with XenServer hypervisors, the hosts must
be joined to a XenServer pool. To create that pool, a host aggregate must be
created with specific metadata. This metadata is used by the XAPI plug-ins to
establish the pool.
.. rubric:: Using shared storage live migrations with XenServer Hypervisors
#. Add an NFS VHD storage to your master XenServer, and set it as the default
storage repository. For more information, see NFS VHD in the XenServer
Administrator's Guide.
#. Configure all compute nodes to use the default storage repository (``sr``)
for pool operations. Add this line to your ``nova.conf`` configuration files
on all compute nodes:
.. code-block:: ini
sr_matching_filter=default-sr:true
#. Create a host aggregate. This command creates the aggregate, and then
displays a table that contains the ID of the new aggregate
.. code-block:: console
$ openstack aggregate create --zone AVAILABILITY_ZONE POOL_NAME
Add metadata to the aggregate, to mark it as a hypervisor pool
.. code-block:: console
$ openstack aggregate set --property hypervisor_pool=true AGGREGATE_ID
$ openstack aggregate set --property operational_state=created AGGREGATE_ID
Make the first compute node part of that aggregate
.. code-block:: console
$ openstack aggregate add host AGGREGATE_ID MASTER_COMPUTE_NAME
The host is now part of a XenServer pool.
#. Add hosts to the pool
.. code-block:: console
$ openstack aggregate add host AGGREGATE_ID COMPUTE_HOST_NAME
.. note::
The added compute node and the host will shut down to join the host to
the XenServer pool. The operation will fail if any server other than the
compute node is running or suspended on the host.
.. _configuring-migrations-xenserver-block-migration:
Block migration
---------------
- **Compatible XenServer hypervisors**.
The hypervisors must support the Storage XenMotion feature. See your
XenServer manual to make sure your edition has this feature.
.. note::
- To use block migration, you must use the ``--block-migrate`` parameter
with the live migration command.
- Block migration works only with EXT local storage storage repositories,
and the server must not have any volumes attached.

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==============
CPU topologies
==============
The NUMA topology and CPU pinning features in OpenStack provide high-level
control over how instances run on hypervisor CPUs and the topology of virtual
CPUs available to instances. These features help minimize latency and maximize
performance.
SMP, NUMA, and SMT
~~~~~~~~~~~~~~~~~~
Symmetric multiprocessing (SMP)
SMP is a design found in many modern multi-core systems. In an SMP system,
there are two or more CPUs and these CPUs are connected by some interconnect.
This provides CPUs with equal access to system resources like memory and
input/output ports.
Non-uniform memory access (NUMA)
NUMA is a derivative of the SMP design that is found in many multi-socket
systems. In a NUMA system, system memory is divided into cells or nodes that
are associated with particular CPUs. Requests for memory on other nodes are
possible through an interconnect bus. However, bandwidth across this shared
bus is limited. As a result, competition for this resource can incur
performance penalties.
Simultaneous Multi-Threading (SMT)
SMT is a design complementary to SMP. Whereas CPUs in SMP systems share a bus
and some memory, CPUs in SMT systems share many more components. CPUs that
share components are known as thread siblings. All CPUs appear as usable
CPUs on the system and can execute workloads in parallel. However, as with
NUMA, threads compete for shared resources.
In OpenStack, SMP CPUs are known as *cores*, NUMA cells or nodes are known as
*sockets*, and SMT CPUs are known as *threads*. For example, a quad-socket,
eight core system with Hyper-Threading would have four sockets, eight cores per
socket and two threads per core, for a total of 64 CPUs.
Configuring compute nodes for instances with NUMA placement policies
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hyper-V is configured by default to allow instances to span multiple NUMA
nodes, regardless if the instances have been configured to only span N NUMA
nodes. This behaviour allows Hyper-V instances to have up to 64 vCPUs and 1 TB
of memory.
Checking NUMA spanning can easily be done by running this following powershell
command:
.. code-block:: console
(Get-VMHost).NumaSpanningEnabled
In order to disable this behaviour, the host will have to be configured to
disable NUMA spanning. This can be done by executing these following
powershell commands:
.. code-block:: console
Set-VMHost -NumaSpanningEnabled $false
Restart-Service vmms
In order to restore this behaviour, execute these powershell commands:
.. code-block:: console
Set-VMHost -NumaSpanningEnabled $true
Restart-Service vmms
The ``vmms`` service (Virtual Machine Management Service) is responsible for
managing the Hyper-V VMs. The VMs will still run while the service is down
or restarting, but they will not be manageable by the ``nova-compute``
service. In order for the effects of the Host NUMA spanning configuration
to take effect, the VMs will have to be restarted.
Hyper-V does not allow instances with a NUMA topology to have dynamic
memory allocation turned on. The Hyper-V driver will ignore the configured
``dynamic_memory_ratio`` from the given ``nova.conf`` file when spawning
instances with a NUMA topology.
Customizing instance NUMA placement policies
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. important::
The functionality described below is currently only supported by the
libvirt/KVM and Hyper-V driver.
When running workloads on NUMA hosts, it is important that the vCPUs executing
processes are on the same NUMA node as the memory used by these processes.
This ensures all memory accesses are local to the node and thus do not consume
the limited cross-node memory bandwidth, adding latency to memory accesses.
Similarly, large pages are assigned from memory and benefit from the same
performance improvements as memory allocated using standard pages. Thus, they
also should be local. Finally, PCI devices are directly associated with
specific NUMA nodes for the purposes of DMA. Instances that use PCI or SR-IOV
devices should be placed on the NUMA node associated with these devices.
By default, an instance floats across all NUMA nodes on a host. NUMA awareness
can be enabled implicitly through the use of huge pages or pinned CPUs or
explicitly through the use of flavor extra specs or image metadata. In all
cases, the ``NUMATopologyFilter`` filter must be enabled. Details on this
filter are provided in `Scheduling`_ configuration guide.
.. caution::
The NUMA node(s) used are normally chosen at random. However, if a PCI
passthrough or SR-IOV device is attached to the instance, then the NUMA
node that the device is associated with will be used. This can provide
important performance improvements. However, booting a large number of
similar instances can result in unbalanced NUMA node usage. Care should
be taken to mitigate this issue. See this `discussion`_ for more details.
.. caution::
Inadequate per-node resources will result in scheduling failures. Resources
that are specific to a node include not only CPUs and memory, but also PCI
and SR-IOV resources. It is not possible to use multiple resources from
different nodes without requesting a multi-node layout. As such, it may be
necessary to ensure PCI or SR-IOV resources are associated with the same
NUMA node or force a multi-node layout.
When used, NUMA awareness allows the operating system of the instance to
intelligently schedule the workloads that it runs and minimize cross-node
memory bandwidth. To restrict an instance's vCPUs to a single host NUMA node,
run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:numa_nodes=1
Some workloads have very demanding requirements for memory access latency or
bandwidth that exceed the memory bandwidth available from a single NUMA node.
For such workloads, it is beneficial to spread the instance across multiple
host NUMA nodes, even if the instance's RAM/vCPUs could theoretically fit on a
single NUMA node. To force an instance's vCPUs to spread across two host NUMA
nodes, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:numa_nodes=2
The allocation of instances vCPUs and memory from different host NUMA nodes can
be configured. This allows for asymmetric allocation of vCPUs and memory, which
can be important for some workloads. To spread the 6 vCPUs and 6 GB of memory
of an instance across two NUMA nodes and create an asymmetric 1:2 vCPU and
memory mapping between the two nodes, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:numa_nodes=2
$ openstack flavor set m1.large \ # configure guest node 0
--property hw:numa_cpus.0=0,1 \
--property hw:numa_mem.0=2048
$ openstack flavor set m1.large \ # configure guest node 1
--property hw:numa_cpus.1=2,3,4,5 \
--property hw:numa_mem.1=4096
.. note::
Hyper-V does not support asymmetric NUMA topologies, and the Hyper-V
driver will not spawn instances with such topologies.
For more information about the syntax for ``hw:numa_nodes``, ``hw:numa_cpus.N``
and ``hw:num_mem.N``, refer to the `Flavors`_ guide.
Customizing instance CPU pinning policies
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. important::
The functionality described below is currently only supported by the
libvirt/KVM driver. Hyper-V does not support CPU pinning.
By default, instance vCPU processes are not assigned to any particular host
CPU, instead, they float across host CPUs like any other process. This allows
for features like overcommitting of CPUs. In heavily contended systems, this
provides optimal system performance at the expense of performance and latency
for individual instances.
Some workloads require real-time or near real-time behavior, which is not
possible with the latency introduced by the default CPU policy. For such
workloads, it is beneficial to control which host CPUs are bound to an
instance's vCPUs. This process is known as pinning. No instance with pinned
CPUs can use the CPUs of another pinned instance, thus preventing resource
contention between instances. To configure a flavor to use pinned vCPUs, a
use a dedicated CPU policy. To force this, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:cpu_policy=dedicated
.. caution::
Host aggregates should be used to separate pinned instances from unpinned
instances as the latter will not respect the resourcing requirements of
the former.
When running workloads on SMT hosts, it is important to be aware of the impact
that thread siblings can have. Thread siblings share a number of components
and contention on these components can impact performance. To configure how
to use threads, a CPU thread policy should be specified. For workloads where
sharing benefits performance, use thread siblings. To force this, run:
.. code-block:: console
$ openstack flavor set m1.large \
--property hw:cpu_policy=dedicated \
--property hw:cpu_thread_policy=require
For other workloads where performance is impacted by contention for resources,
use non-thread siblings or non-SMT hosts. To force this, run:
.. code-block:: console
$ openstack flavor set m1.large \
--property hw:cpu_policy=dedicated \
--property hw:cpu_thread_policy=isolate
Finally, for workloads where performance is minimally impacted, use thread
siblings if available. This is the default, but it can be set explicitly:
.. code-block:: console
$ openstack flavor set m1.large \
--property hw:cpu_policy=dedicated \
--property hw:cpu_thread_policy=prefer
For more information about the syntax for ``hw:cpu_policy`` and
``hw:cpu_thread_policy``, refer to the `Flavors`_ guide.
Applications are frequently packaged as images. For applications that require
real-time or near real-time behavior, configure image metadata to ensure
created instances are always pinned regardless of flavor. To configure an
image to use pinned vCPUs and avoid thread siblings, run:
.. code-block:: console
$ openstack image set [IMAGE_ID] \
--property hw_cpu_policy=dedicated \
--property hw_cpu_thread_policy=isolate
If the flavor specifies a CPU policy of ``dedicated`` then that policy will be
used. If the flavor explicitly specifies a CPU policy of ``shared`` and the
image specifies no policy or a policy of ``shared`` then the ``shared`` policy
will be used, but if the image specifies a policy of ``dedicated`` an exception
will be raised. By setting a ``shared`` policy through flavor extra-specs,
administrators can prevent users configuring CPU policies in images and
impacting resource utilization. To configure this policy, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:cpu_policy=shared
If the flavor does not specify a CPU thread policy then the CPU thread policy
specified by the image (if any) will be used. If both the flavor and image
specify a CPU thread policy then they must specify the same policy, otherwise
an exception will be raised.
.. note::
There is no correlation required between the NUMA topology exposed in the
instance and how the instance is actually pinned on the host. This is by
design. See this `invalid bug
<https://bugs.launchpad.net/nova/+bug/1466780>`_ for more information.
For more information about image metadata, refer to the `Image metadata`_
guide.
Customizing instance CPU topologies
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. important::
The functionality described below is currently only supported by the
libvirt/KVM driver.
In addition to configuring how an instance is scheduled on host CPUs, it is
possible to configure how CPUs are represented in the instance itself. By
default, when instance NUMA placement is not specified, a topology of N
sockets, each with one core and one thread, is used for an instance, where N
corresponds to the number of instance vCPUs requested. When instance NUMA
placement is specified, the number of sockets is fixed to the number of host
NUMA nodes to use and the total number of instance CPUs is split over these
sockets.
Some workloads benefit from a custom topology. For example, in some operating
systems, a different license may be needed depending on the number of CPU
sockets. To configure a flavor to use a maximum of two sockets, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:cpu_sockets=2
Similarly, to configure a flavor to use one core and one thread, run:
.. code-block:: console
$ openstack flavor set m1.large \
--property hw:cpu_cores=1 \
--property hw:cpu_threads=1
.. caution::
If specifying all values, the product of sockets multiplied by cores
multiplied by threads must equal the number of instance vCPUs. If specifying
any one of these values or the multiple of two values, the values must be a
factor of the number of instance vCPUs to prevent an exception. For example,
specifying ``hw:cpu_sockets=2`` on a host with an odd number of cores fails.
Similarly, specifying ``hw:cpu_cores=2`` and ``hw:cpu_threads=4`` on a host
with ten cores fails.
For more information about the syntax for ``hw:cpu_sockets``, ``hw:cpu_cores``
and ``hw:cpu_threads``, refer to the `Flavors`_ guide.
It is also possible to set upper limits on the number of sockets, cores, and
threads used. Unlike the hard values above, it is not necessary for this exact
number to used because it only provides a limit. This can be used to provide
some flexibility in scheduling, while ensuring certains limits are not
exceeded. For example, to ensure no more than two sockets are defined in the
instance topology, run:
.. code-block:: console
$ openstack flavor set m1.large --property=hw:cpu_max_sockets=2
For more information about the syntax for ``hw:cpu_max_sockets``,
``hw:cpu_max_cores``, and ``hw:cpu_max_threads``, refer to the `Flavors`_
guide.
Applications are frequently packaged as images. For applications that prefer
certain CPU topologies, configure image metadata to hint that created instances
should have a given topology regardless of flavor. To configure an image to
request a two-socket, four-core per socket topology, run:
.. code-block:: console
$ openstack image set [IMAGE_ID] \
--property hw_cpu_sockets=2 \
--property hw_cpu_cores=4
To constrain instances to a given limit of sockets, cores or threads, use the
``max_`` variants. To configure an image to have a maximum of two sockets and a
maximum of one thread, run:
.. code-block:: console
$ openstack image set [IMAGE_ID] \
--property hw_cpu_max_sockets=2 \
--property hw_cpu_max_threads=1
The value specified in the flavor is treated as the abolute limit. The image
limits are not permitted to exceed the flavor limits, they can only be equal
to or lower than what the flavor defines. By setting a ``max`` value for
sockets, cores, or threads, administrators can prevent users configuring
topologies that might, for example, incur an additional licensing fees.
For more information about image metadata, refer to the `Image metadata`_
guide.
.. Links
.. _`Scheduling`: https://docs.openstack.org/ocata/config-reference/compute/schedulers.html
.. _`Flavors`: https://docs.openstack.org/admin-guide/compute-flavors.html
.. _`Image metadata`: https://docs.openstack.org/image-guide/image-metadata.html
.. _`discussion`: http://lists.openstack.org/pipermail/openstack-dev/2016-March/090367.html

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==========================================
Compute service node firewall requirements
==========================================
Console connections for virtual machines, whether direct or through a
proxy, are received on ports ``5900`` to ``5999``. The firewall on each
Compute service node must allow network traffic on these ports.
This procedure modifies the iptables firewall to allow incoming
connections to the Compute services.
**Configuring the service-node firewall**
#. Log in to the server that hosts the Compute service, as root.
#. Edit the ``/etc/sysconfig/iptables`` file, to add an INPUT rule that
allows TCP traffic on ports from ``5900`` to ``5999``. Make sure the new
rule appears before any INPUT rules that REJECT traffic:
.. code-block:: console
-A INPUT -p tcp -m multiport --dports 5900:5999 -j ACCEPT
#. Save the changes to the ``/etc/sysconfig/iptables`` file, and restart the
``iptables`` service to pick up the changes:
.. code-block:: console
$ service iptables restart
#. Repeat this process for each Compute service node.

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=================================
Managing the cloud with euca2ools
=================================
The ``euca2ools`` command-line tool provides a command line interface to EC2
API calls. For more information, see the `Official Eucalyptus Documentation
<http://docs.hpcloud.com/eucalyptus/>`_.

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<desc>Sends «authorize_console » message</desc>
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=======
Flavors
=======
Admin users can use the :command:`openstack flavor` command to customize and
manage flavors. To see information for this command, run:
.. code-block:: console
$ openstack flavor --help
Command "flavor" matches:
flavor create
flavor delete
flavor list
flavor set
flavor show
flavor unset
.. note::
- Configuration rights can be delegated to additional users by redefining
the access controls for ``compute_extension:flavormanage`` in
``/etc/nova/policy.json`` on the ``nova-api`` server.
- The Dashboard simulates the ability to modify a flavor by deleting an
existing flavor and creating a new one with the same name.
Flavors define these elements:
.. todo:: This would be much easier to read as a list-table or similar
+-------------+---------------------------------------------------------------+
| Element | Description |
+=============+===============================================================+
| Name | A descriptive name. XX.SIZE_NAME is typically not required, |
| | though some third party tools may rely on it. |
+-------------+---------------------------------------------------------------+
| Memory MB | Instance memory in megabytes. |
+-------------+---------------------------------------------------------------+
| Disk | Virtual root disk size in gigabytes. This is an ephemeral di\ |
| | sk that the base image is copied into. When booting from a p\ |
| | ersistent volume it is not used. The "0" size is a special c\ |
| | ase which uses the native base image size as the size of the |
| | ephemeral root volume. However, in this case the filter |
| | scheduler cannot select the compute host based on the virtual |
| | image size. Therefore 0 should only be used for volume booted |
| | instances or for testing purposes. |
+-------------+---------------------------------------------------------------+
| Ephemeral | Specifies the size of a secondary ephemeral data disk. This |
| | is an empty, unformatted disk and exists only for the life o\ |
| | f the instance. Default value is ``0``. |
+-------------+---------------------------------------------------------------+
| Swap | Optional swap space allocation for the instance. Default |
| | value is ``0``. |
+-------------+---------------------------------------------------------------+
| VCPUs | Number of virtual CPUs presented to the instance. |
+-------------+---------------------------------------------------------------+
| RXTX Factor | Optional property allows created servers to have a different |
| | bandwidth cap than that defined in the network they are att\ |
| | ached to. This factor is multiplied by the rxtx_base propert\ |
| | y of the network. Default value is ``1.0``. That is, the same |
| | as attached network. This parameter is only available for Xen |
| | or NSX based systems. |
+-------------+---------------------------------------------------------------+
| Is Public | Boolean value, whether flavor is available to all users or p\ |
| | rivate to the project it was created in. Defaults to ``True``.|
+-------------+---------------------------------------------------------------+
| Extra Specs | Key and value pairs that define on which compute nodes a fla\ |
| | vor can run. These pairs must match corresponding pairs on t\ |
| | he compute nodes. Use to implement special resources, such a\ |
| | s flavors that run on only compute nodes with GPU hardware. |
+-------------+---------------------------------------------------------------+
.. note::
Flavor customization can be limited by the hypervisor in use. For example
the libvirt driver enables quotas on CPUs available to a VM, disk tuning,
bandwidth I/O, watchdog behavior, random number generator device control,
and instance VIF traffic control.
Is Public
~~~~~~~~~
Flavors can be assigned to particular projects. By default, a flavor is public
and available to all projects. Private flavors are only accessible to those on
the access list and are invisible to other projects. To create and assign a
private flavor to a project, run this command:
.. code-block:: console
$ openstack flavor create --private p1.medium --id auto --ram 512 --disk 40 --vcpus 4
Extra Specs
~~~~~~~~~~~
CPU limits
You can configure the CPU limits with control parameters with the ``nova``
client. For example, to configure the I/O limit, use:
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property quota:read_bytes_sec=10240000 \
--property quota:write_bytes_sec=10240000
Use these optional parameters to control weight shares, enforcement intervals
for runtime quotas, and a quota for maximum allowed bandwidth:
- ``cpu_shares``: Specifies the proportional weighted share for the domain.
If this element is omitted, the service defaults to the OS provided
defaults. There is no unit for the value; it is a relative measure based on
the setting of other VMs. For example, a VM configured with value 2048 gets
twice as much CPU time as a VM configured with value 1024.
- ``cpu_shares_level``: On VMware, specifies the allocation level. Can be
``custom``, ``high``, ``normal``, or ``low``. If you choose ``custom``, set
the number of shares using ``cpu_shares_share``.
- ``cpu_period``: Specifies the enforcement interval (unit: microseconds)
for QEMU and LXC hypervisors. Within a period, each VCPU of the domain is
not allowed to consume more than the quota worth of runtime. The value
should be in range ``[1000, 1000000]``. A period with value 0 means no
value.
- ``cpu_limit``: Specifies the upper limit for VMware machine CPU allocation
in MHz. This parameter ensures that a machine never uses more than the
defined amount of CPU time. It can be used to enforce a limit on the
machine's CPU performance.
- ``cpu_reservation``: Specifies the guaranteed minimum CPU reservation in
MHz for VMware. This means that if needed, the machine will definitely get
allocated the reserved amount of CPU cycles.
- ``cpu_quota``: Specifies the maximum allowed bandwidth (unit:
microseconds). A domain with a negative-value quota indicates that the
domain has infinite bandwidth, which means that it is not bandwidth
controlled. The value should be in range ``[1000, 18446744073709551]`` or
less than 0. A quota with value 0 means no value. You can use this feature
to ensure that all vCPUs run at the same speed. For example:
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property quota:cpu_quota=10000 \
--property quota:cpu_period=20000
In this example, an instance of ``FLAVOR-NAME`` can only consume a maximum
of 50% CPU of a physical CPU computing capability.
Memory limits
For VMware, you can configure the memory limits with control parameters.
Use these optional parameters to limit the memory allocation, guarantee
minimum memory reservation, and to specify shares used in case of resource
contention:
- ``memory_limit``: Specifies the upper limit for VMware machine memory
allocation in MB. The utilization of a virtual machine will not exceed this
limit, even if there are available resources. This is typically used to
ensure a consistent performance of virtual machines independent of
available resources.
- ``memory_reservation``: Specifies the guaranteed minimum memory reservation
in MB for VMware. This means the specified amount of memory will definitely
be allocated to the machine.
- ``memory_shares_level``: On VMware, specifies the allocation level. This
can be ``custom``, ``high``, ``normal`` or ``low``. If you choose
``custom``, set the number of shares using ``memory_shares_share``.
- ``memory_shares_share``: Specifies the number of shares allocated in the
event that ``custom`` is used. There is no unit for this value. It is a
relative measure based on the settings for other VMs. For example:
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property quota:memory_shares_level=custom \
--property quota:memory_shares_share=15
Disk I/O limits
For VMware, you can configure the resource limits for disk with control
parameters.
Use these optional parameters to limit the disk utilization, guarantee disk
allocation, and to specify shares used in case of resource contention. This
allows the VMware driver to enable disk allocations for the running instance.
- ``disk_io_limit``: Specifies the upper limit for disk utilization in I/O
per second. The utilization of a virtual machine will not exceed this
limit, even if there are available resources. The default value is -1 which
indicates unlimited usage.
- ``disk_io_reservation``: Specifies the guaranteed minimum disk allocation
in terms of Input/output Operations Per Second (IOPS).
- ``disk_io_shares_level``: Specifies the allocation level. This can be
``custom``, ``high``, ``normal`` or ``low``. If you choose custom, set the
number of shares using ``disk_io_shares_share``.
- ``disk_io_shares_share``: Specifies the number of shares allocated in the
event that ``custom`` is used. When there is resource contention, this
value is used to determine the resource allocation.
The example below sets the ``disk_io_reservation`` to 2000 IOPS.
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property quota:disk_io_reservation=2000
Disk tuning
Using disk I/O quotas, you can set maximum disk write to 10 MB per second for
a VM user. For example:
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property quota:disk_write_bytes_sec=10485760
The disk I/O options are:
- ``disk_read_bytes_sec``
- ``disk_read_iops_sec``
- ``disk_write_bytes_sec``
- ``disk_write_iops_sec``
- ``disk_total_bytes_sec``
- ``disk_total_iops_sec``
Bandwidth I/O
The vif I/O options are:
- ``vif_inbound_average``
- ``vif_inbound_burst``
- ``vif_inbound_peak``
- ``vif_outbound_average``
- ``vif_outbound_burst``
- ``vif_outbound_peak``
Incoming and outgoing traffic can be shaped independently. The bandwidth
element can have at most, one inbound and at most, one outbound child
element. If you leave any of these child elements out, no quality of service
(QoS) is applied on that traffic direction. So, if you want to shape only the
network's incoming traffic, use inbound only (and vice versa). Each element
has one mandatory attribute average, which specifies the average bit rate on
the interface being shaped.
There are also two optional attributes (integer): ``peak``, which specifies
the maximum rate at which a bridge can send data (kilobytes/second), and
``burst``, the amount of bytes that can be burst at peak speed (kilobytes).
The rate is shared equally within domains connected to the network.
The example below sets network traffic bandwidth limits for existing flavor
as follows:
- Outbound traffic:
- average: 262 Mbps (32768 kilobytes/second)
- peak: 524 Mbps (65536 kilobytes/second)
- burst: 65536 kilobytes
- Inbound traffic:
- average: 262 Mbps (32768 kilobytes/second)
- peak: 524 Mbps (65536 kilobytes/second)
- burst: 65536 kilobytes
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property quota:vif_outbound_average=32768 \
--property quota:vif_outbound_peak=65536 \
--property quota:vif_outbound_burst=65536 \
--property quota:vif_inbound_average=32768 \
--property quota:vif_inbound_peak=65536 \
--property quota:vif_inbound_burst=65536
.. note::
All the speed limit values in above example are specified in
kilobytes/second. And burst values are in kilobytes. Values were converted
using 'Data rate units on Wikipedia
<https://en.wikipedia.org/wiki/Data_rate_units>`_.
Watchdog behavior
For the libvirt driver, you can enable and set the behavior of a virtual
hardware watchdog device for each flavor. Watchdog devices keep an eye on the
guest server, and carry out the configured action, if the server hangs. The
watchdog uses the i6300esb device (emulating a PCI Intel 6300ESB). If
``hw:watchdog_action`` is not specified, the watchdog is disabled.
To set the behavior, use:
.. code-block:: console
$ openstack flavor set FLAVOR-NAME --property hw:watchdog_action=ACTION
Valid ACTION values are:
- ``disabled``: (default) The device is not attached.
- ``reset``: Forcefully reset the guest.
- ``poweroff``: Forcefully power off the guest.
- ``pause``: Pause the guest.
- ``none``: Only enable the watchdog; do nothing if the server hangs.
.. note::
Watchdog behavior set using a specific image's properties will override
behavior set using flavors.
Random-number generator
If a random-number generator device has been added to the instance through
its image properties, the device can be enabled and configured using:
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property hw_rng:allowed=True \
--property hw_rng:rate_bytes=RATE-BYTES \
--property hw_rng:rate_period=RATE-PERIOD
Where:
- RATE-BYTES: (integer) Allowed amount of bytes that the guest can read from
the host's entropy per period.
- RATE-PERIOD: (integer) Duration of the read period in seconds.
CPU topology
For the libvirt driver, you can define the topology of the processors in the
virtual machine using properties. The properties with ``max`` limit the
number that can be selected by the user with image properties.
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property hw:cpu_sockets=FLAVOR-SOCKETS \
--property hw:cpu_cores=FLAVOR-CORES \
--property hw:cpu_threads=FLAVOR-THREADS \
--property hw:cpu_max_sockets=FLAVOR-SOCKETS \
--property hw:cpu_max_cores=FLAVOR-CORES \
--property hw:cpu_max_threads=FLAVOR-THREADS
Where:
- FLAVOR-SOCKETS: (integer) The number of sockets for the guest VM. By
default, this is set to the number of vCPUs requested.
- FLAVOR-CORES: (integer) The number of cores per socket for the guest VM. By
default, this is set to ``1``.
- FLAVOR-THREADS: (integer) The number of threads per core for the guest VM.
By default, this is set to ``1``.
CPU pinning policy
For the libvirt driver, you can pin the virtual CPUs (vCPUs) of instances to
the host's physical CPU cores (pCPUs) using properties. You can further
refine this by stating how hardware CPU threads in a simultaneous
multithreading-based (SMT) architecture be used. These configurations will
result in improved per-instance determinism and performance.
.. note::
SMT-based architectures include Intel processors with Hyper-Threading
technology. In these architectures, processor cores share a number of
components with one or more other cores. Cores in such architectures are
commonly referred to as hardware threads, while the cores that a given
core share components with are known as thread siblings.
.. note::
Host aggregates should be used to separate these pinned instances from
unpinned instances as the latter will not respect the resourcing
requirements of the former.
.. code:: console
$ openstack flavor set FLAVOR-NAME \
--property hw:cpu_policy=CPU-POLICY \
--property hw:cpu_thread_policy=CPU-THREAD-POLICY
Valid CPU-POLICY values are:
- ``shared``: (default) The guest vCPUs will be allowed to freely float
across host pCPUs, albeit potentially constrained by NUMA policy.
- ``dedicated``: The guest vCPUs will be strictly pinned to a set of host
pCPUs. In the absence of an explicit vCPU topology request, the drivers
typically expose all vCPUs as sockets with one core and one thread. When
strict CPU pinning is in effect the guest CPU topology will be setup to
match the topology of the CPUs to which it is pinned. This option implies
an overcommit ratio of 1.0. For example, if a two vCPU guest is pinned to a
single host core with two threads, then the guest will get a topology of
one socket, one core, two threads.
Valid CPU-THREAD-POLICY values are:
- ``prefer``: (default) The host may or may not have an SMT architecture.
Where an SMT architecture is present, thread siblings are preferred.
- ``isolate``: The host must not have an SMT architecture or must emulate a
non-SMT architecture. If the host does not have an SMT architecture, each
vCPU is placed on a different core as expected. If the host does have an
SMT architecture - that is, one or more cores have thread siblings - then
each vCPU is placed on a different physical core. No vCPUs from other
guests are placed on the same core. All but one thread sibling on each
utilized core is therefore guaranteed to be unusable.
- ``require``: The host must have an SMT architecture. Each vCPU is allocated
on thread siblings. If the host does not have an SMT architecture, then it
is not used. If the host has an SMT architecture, but not enough cores with
free thread siblings are available, then scheduling fails.
.. note::
The ``hw:cpu_thread_policy`` option is only valid if ``hw:cpu_policy`` is
set to ``dedicated``.
NUMA topology
For the libvirt driver, you can define the host NUMA placement for the
instance vCPU threads as well as the allocation of instance vCPUs and memory
from the host NUMA nodes. For flavors whose memory and vCPU allocations are
larger than the size of NUMA nodes in the compute hosts, the definition of a
NUMA topology allows hosts to better utilize NUMA and improve performance of
the instance OS.
.. code-block:: console
$ openstack flavor set FLAVOR-NAME \
--property hw:numa_nodes=FLAVOR-NODES \
--property hw:numa_cpus.N=FLAVOR-CORES \
--property hw:numa_mem.N=FLAVOR-MEMORY
Where:
- FLAVOR-NODES: (integer) The number of host NUMA nodes to restrict execution
of instance vCPU threads to. If not specified, the vCPU threads can run on
any number of the host NUMA nodes available.
- N: (integer) The instance NUMA node to apply a given CPU or memory
configuration to, where N is in the range ``0`` to ``FLAVOR-NODES - 1``.
- FLAVOR-CORES: (comma-separated list of integers) A list of instance vCPUs
to map to instance NUMA node N. If not specified, vCPUs are evenly divided
among available NUMA nodes.
- FLAVOR-MEMORY: (integer) The number of MB of instance memory to map to
instance NUMA node N. If not specified, memory is evenly divided among
available NUMA nodes.
.. note::
``hw:numa_cpus.N`` and ``hw:numa_mem.N`` are only valid if
``hw:numa_nodes`` is set. Additionally, they are only required if the
instance's NUMA nodes have an asymmetrical allocation of CPUs and RAM
(important for some NFV workloads).
.. note::
The ``N`` parameter is an index of *guest* NUMA nodes and may not
correspond to *host* NUMA nodes. For example, on a platform with two NUMA
nodes, the scheduler may opt to place guest NUMA node 0, as referenced in
``hw:numa_mem.0`` on host NUMA node 1 and vice versa. Similarly, the
integers used for ``FLAVOR-CORES`` are indexes of *guest* vCPUs and may
not correspond to *host* CPUs. As such, this feature cannot be used to
constrain instances to specific host CPUs or NUMA nodes.
.. warning::
If the combined values of ``hw:numa_cpus.N`` or ``hw:numa_mem.N`` are
greater than the available number of CPUs or memory respectively, an
exception is raised.
Large pages allocation
You can configure the size of large pages used to back the VMs.
.. code:: console
$ openstack flavor set FLAVOR-NAME \
--property hw:mem_page_size=PAGE_SIZE
Valid ``PAGE_SIZE`` values are:
- ``small``: (default) The smallest page size is used. Example: 4 KB on x86.
- ``large``: Only use larger page sizes for guest RAM. Example: either 2 MB
or 1 GB on x86.
- ``any``: It is left up to the compute driver to decide. In this case, the
libvirt driver might try to find large pages, but fall back to small pages.
Other drivers may choose alternate policies for ``any``.
- pagesize: (string) An explicit page size can be set if the workload has
specific requirements. This value can be an integer value for the page size
in KB, or can use any standard suffix. Example: ``4KB``, ``2MB``,
``2048``, ``1GB``.
.. note::
Large pages can be enabled for guest RAM without any regard to whether the
guest OS will use them or not. If the guest OS chooses not to use huge
pages, it will merely see small pages as before. Conversely, if a guest OS
does intend to use huge pages, it is very important that the guest RAM be
backed by huge pages. Otherwise, the guest OS will not be getting the
performance benefit it is expecting.
PCI passthrough
You can assign PCI devices to a guest by specifying them in the flavor.
.. code:: console
$ openstack flavor set FLAVOR-NAME \
--property pci_passthrough:alias=ALIAS:COUNT
Where:
- ALIAS: (string) The alias which correspond to a particular PCI device class
as configured in the nova configuration file (see `nova.conf configuration
options
<https://docs.openstack.org/ocata/config-reference/compute/config-options.html>`_).
- COUNT: (integer) The amount of PCI devices of type ALIAS to be assigned to
a guest.
Secure Boot
When your Compute services use the Hyper-V hypervisor, you can enable secure
boot for Windows and Linux instances.
.. code:: console
$ openstack flavor set FLAVOR-NAME \
--property os:secure_boot=SECURE_BOOT_OPTION
Valid ``SECURE_BOOT_OPTION`` values are:
- ``required``: Enable Secure Boot for instances running with this flavor.
- ``disabled`` or ``optional``: (default) Disable Secure Boot for instances
running with this flavor.

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==========
Huge pages
==========
The huge page feature in OpenStack provides important performance improvements
for applications that are highly memory IO-bound.
.. note::
Huge pages may also be referred to hugepages or large pages, depending on
the source. These terms are synonyms.
Pages, the TLB and huge pages
-----------------------------
Pages
Physical memory is segmented into a series of contiguous regions called
pages. Each page contains a number of bytes, referred to as the page size.
The system retrieves memory by accessing entire pages, rather than byte by
byte.
Translation Lookaside Buffer (TLB)
A TLB is used to map the virtual addresses of pages to the physical addresses
in actual memory. The TLB is a cache and is not limitless, storing only the
most recent or frequently accessed pages. During normal operation, processes
will sometimes attempt to retrieve pages that are not stored in the cache.
This is known as a TLB miss and results in a delay as the processor iterates
through the pages themselves to find the missing address mapping.
Huge Pages
The standard page size in x86 systems is 4 kB. This is optimal for general
purpose computing but larger page sizes - 2 MB and 1 GB - are also available.
These larger page sizes are known as huge pages. Huge pages result in less
efficient memory usage as a process will not generally use all memory
available in each page. However, use of huge pages will result in fewer
overall pages and a reduced risk of TLB misses. For processes that have
significant memory requirements or are memory intensive, the benefits of huge
pages frequently outweigh the drawbacks.
Persistent Huge Pages
On Linux hosts, persistent huge pages are huge pages that are reserved
upfront. The HugeTLB provides for the mechanism for this upfront
configuration of huge pages. The HugeTLB allows for the allocation of varying
quantities of different huge page sizes. Allocation can be made at boot time
or run time. Refer to the `Linux hugetlbfs guide`_ for more information.
Transparent Huge Pages (THP)
On Linux hosts, transparent huge pages are huge pages that are automatically
provisioned based on process requests. Transparent huge pages are provisioned
on a best effort basis, attempting to provision 2 MB huge pages if available
but falling back to 4 kB small pages if not. However, no upfront
configuration is necessary. Refer to the `Linux THP guide`_ for more
information.
Enabling huge pages on the host
-------------------------------
Persistent huge pages are required owing to their guaranteed availability.
However, persistent huge pages are not enabled by default in most environments.
The steps for enabling huge pages differ from platform to platform and only the
steps for Linux hosts are described here. On Linux hosts, the number of
persistent huge pages on the host can be queried by checking ``/proc/meminfo``:
.. code-block:: console
$ grep Huge /proc/meminfo
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
In this instance, there are 0 persistent huge pages (``HugePages_Total``) and 0
transparent huge pages (``AnonHugePages``) allocated. Huge pages can be
allocated at boot time or run time. Huge pages require a contiguous area of
memory - memory that gets increasingly fragmented the long a host is running.
Identifying contiguous areas of memory is a issue for all huge page sizes, but
it is particularly problematic for larger huge page sizes such as 1 GB huge
pages. Allocating huge pages at boot time will ensure the correct number of huge
pages is always available, while allocating them at run time can fail if memory
has become too fragmented.
To allocate huge pages at run time, the kernel boot parameters must be extended
to include some huge page-specific parameters. This can be achieved by
modifying ``/etc/default/grub`` and appending the ``hugepagesz``,
``hugepages``, and ``transparent_hugepages=never`` arguments to
``GRUB_CMDLINE_LINUX``. To allocate, for example, 2048 persistent 2 MB huge
pages at boot time, run:
.. code-block:: console
# echo 'GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX hugepagesz=2M hugepages=2048 transparent_hugepage=never"' > /etc/default/grub
$ grep GRUB_CMDLINE_LINUX /etc/default/grub
GRUB_CMDLINE_LINUX="..."
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX hugepagesz=2M hugepages=2048 transparent_hugepage=never"
.. important::
Persistent huge pages are not usable by standard host OS processes. Ensure
enough free, non-huge page memory is reserved for these processes.
Reboot the host, then validate that huge pages are now available:
.. code-block:: console
$ grep "Huge" /proc/meminfo
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
HugePages_Total: 2048
HugePages_Free: 2048
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
There are now 2048 2 MB huge pages totalling 4 GB of huge pages. These huge
pages must be mounted. On most platforms, this happens automatically. To verify
that the huge pages are mounted, run:
.. code-block:: console
# mount | grep huge
hugetlbfs on /dev/hugepages type hugetlbfs (rw)
In this instance, the huge pages are mounted at ``/dev/hugepages``. This mount
point varies from platform to platform. If the above command did not return
anything, the hugepages must be mounted manually. To mount the huge pages at
``/dev/hugepages``, run:
.. code-block:: console
# mkdir -p /dev/hugepages
# mount -t hugetlbfs hugetlbfs /dev/hugepages
There are many more ways to configure huge pages, including allocating huge
pages at run time, specifying varying allocations for different huge page
sizes, or allocating huge pages from memory affinitized to different NUMA
nodes. For more information on configuring huge pages on Linux hosts, refer to
the `Linux hugetlbfs guide`_.
Customizing instance huge pages allocations
-------------------------------------------
.. important::
The functionality described below is currently only supported by the
libvirt/KVM driver.
.. important::
For performance reasons, configuring huge pages for an instance will
implicitly result in a NUMA topology being configured for the instance.
Configuring a NUMA topology for an instance requires enablement of
``NUMATopologyFilter``. Refer to :doc:`cpu-topologies` for more
information.
By default, an instance does not use huge pages for its underlying memory.
However, huge pages can bring important or required performance improvements
for some workloads. Huge pages must be requested explicitly through the use of
flavor extra specs or image metadata. To request an instance use huge pages,
run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:mem_page_size=large
Different platforms offer different huge page sizes. For example: x86-based
platforms offer 2 MB and 1 GB huge page sizes. Specific huge page sizes can be
also be requested, with or without a unit suffix. The unit suffix must be one
of: Kb(it), Kib(it), Mb(it), Mib(it), Gb(it), Gib(it), Tb(it), Tib(it), KB,
KiB, MB, MiB, GB, GiB, TB, TiB. Where a unit suffix is not provided, Kilobytes
are assumed. To request an instance to use 2 MB huge pages, run one of:
.. code-block:: console
$ openstack flavor set m1.large --property hw:mem_page_size=2Mb
.. code-block:: console
$ openstack flavor set m1.large --property hw:mem_page_size=2048
Enabling huge pages for an instance can have negative consequences for other
instances by consuming limited huge pages resources. To explicitly request
an instance use small pages, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:mem_page_size=small
.. note::
Explicitly requesting any page size will still result in a NUMA topology
being applied to the instance, as described earlier in this document.
Finally, to leave the decision of huge or small pages to the compute driver,
run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:mem_page_size=any
For more information about the syntax for ``hw:mem_page_size``, refer to the
`Flavors`_ guide.
Applications are frequently packaged as images. For applications that require
the IO performance improvements that huge pages provides, configure image
metadata to ensure instances always request the specific page size regardless
of flavor. To configure an image to use 1 GB huge pages, run:
.. code-block:: console
$ openstack image set [IMAGE_ID] --property hw_mem_page_size=1GB
If the flavor specifies a numerical page size or a page size of "small" the
image is not allowed to specify a page size and if it does an exception will
be raised. If the flavor specifies a page size of ``any`` or ``large`` then
any page size specified in the image will be used. By setting a ``small``
page size in the flavor, administrators can prevent users requesting huge
pages in flavors and impacting resource utilization. To configure this page
size, run:
.. code-block:: console
$ openstack flavor set m1.large --property hw:mem_page_size=small
.. note::
Explicitly requesting any page size will still result in a NUMA topology
being applied to the instance, as described earlier in this document.
For more information about image metadata, refer to the `Image metadata`_
guide.
.. Links
.. _`Linux THP guide`: https://www.kernel.org/doc/Documentation/vm/transhuge.txt
.. _`Linux hugetlbfs guide`: https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt
.. _`Flavors`: https://docs.openstack.org/admin-guide/compute-flavors.html
.. _`Image metadata`: https://docs.openstack.org/image-guide/image-metadata.html

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=======
Compute
=======
The OpenStack Compute service allows you to control an
Infrastructure-as-a-Service (IaaS) cloud computing platform. It gives you
control over instances and networks, and allows you to manage access to the
cloud through users and projects.
Compute does not include virtualization software. Instead, it defines drivers
that interact with underlying virtualization mechanisms that run on your host
operating system, and exposes functionality over a web-based API.
.. toctree::
:maxdepth: 2
arch.rst
networking-nova.rst
system-admin.rst
support-compute.rst

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======================
Live-migrate instances
======================
Live-migrating an instance means moving its virtual machine to a different
OpenStack Compute server while the instance continues running. Before starting
a live-migration, review the chapter
:ref:`section_configuring-compute-migrations`. It covers the configuration
settings required to enable live-migration, but also reasons for migrations and
non-live-migration options.
The instructions below cover shared-storage and volume-backed migration. To
block-migrate instances, add the command-line option
:command:``--block-migrate`` to the :command:``nova live-migration`` command,
and :command:``--block-migration`` to the :command:``openstack server migrate``
command.
.. _section-manual-selection-of-dest:
Manual selection of the destination host
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#. Obtain the ID of the instance you want to migrate:
.. code-block:: console
$ openstack server list
+--------------------------------------+------+--------+-----------------+------------+
| ID | Name | Status | Networks | Image Name |
+--------------------------------------+------+--------+-----------------+------------+
| d1df1b5a-70c4-4fed-98b7-423362f2c47c | vm1 | ACTIVE | private=a.b.c.d | ... |
| d693db9e-a7cf-45ef-a7c9-b3ecb5f22645 | vm2 | ACTIVE | private=e.f.g.h | ... |
+--------------------------------------+------+--------+-----------------+------------+
#. Determine on which host the instance is currently running. In this example,
``vm1`` is running on ``HostB``:
.. code-block:: console
$ openstack server show d1df1b5a-70c4-4fed-98b7-423362f2c47c
+----------------------+--------------------------------------+
| Field | Value |
+----------------------+--------------------------------------+
| ... | ... |
| OS-EXT-SRV-ATTR:host | HostB |
| ... | ... |
| addresses | a.b.c.d |
| flavor | m1.tiny |
| id | d1df1b5a-70c4-4fed-98b7-423362f2c47c |
| name | vm1 |
| status | ACTIVE |
| ... | ... |
+----------------------+--------------------------------------+
#. Select the compute node the instance will be migrated to. In this example,
we will migrate the instance to ``HostC``, because ``nova-compute`` is
running on it:
.. code-block:: console
$ openstack compute service list
+----+------------------+-------+----------+---------+-------+----------------------------+
| ID | Binary | Host | Zone | Status | State | Updated At |
+----+------------------+-------+----------+---------+-------+----------------------------+
| 3 | nova-conductor | HostA | internal | enabled | up | 2017-02-18T09:42:29.000000 |
| 4 | nova-scheduler | HostA | internal | enabled | up | 2017-02-18T09:42:26.000000 |
| 5 | nova-consoleauth | HostA | internal | enabled | up | 2017-02-18T09:42:29.000000 |
| 6 | nova-compute | HostB | nova | enabled | up | 2017-02-18T09:42:29.000000 |
| 7 | nova-compute | HostC | nova | enabled | up | 2017-02-18T09:42:29.000000 |
+----+------------------+-------+----------+---------+-------+----------------------------+
#. Check that ``HostC`` has enough resources for migration:
.. code-block:: console
$ openstack host show HostC
+-------+------------+-----+-----------+---------+
| Host | Project | CPU | Memory MB | Disk GB |
+-------+------------+-----+-----------+---------+
| HostC | (total) | 16 | 32232 | 878 |
| HostC | (used_now) | 22 | 21284 | 422 |
| HostC | (used_max) | 22 | 21284 | 422 |
| HostC | p1 | 22 | 21284 | 422 |
| HostC | p2 | 22 | 21284 | 422 |
+-------+------------+-----+-----------+---------+
- ``cpu``: Number of CPUs
- ``memory_mb``: Total amount of memory, in MB
- ``disk_gb``: Total amount of space for NOVA-INST-DIR/instances, in GB
In this table, the first row shows the total amount of resources available
on the physical server. The second line shows the currently used resources.
The third line shows the maximum used resources. The fourth line and below
shows the resources available for each project.
#. Migrate the instance:
.. code-block:: console
$ openstack server migrate d1df1b5a-70c4-4fed-98b7-423362f2c47c --live HostC
#. Confirm that the instance has been migrated successfully:
.. code-block:: console
$ openstack server show d1df1b5a-70c4-4fed-98b7-423362f2c47c
+----------------------+--------------------------------------+
| Field | Value |
+----------------------+--------------------------------------+
| ... | ... |
| OS-EXT-SRV-ATTR:host | HostC |
| ... | ... |
+----------------------+--------------------------------------+
If the instance is still running on ``HostB``, the migration failed. The
``nova-scheduler`` and ``nova-conductor`` log files on the controller and
the ``nova-compute`` log file on the source compute host can help pin-point
the problem.
.. _auto_selection_of_dest:
Automatic selection of the destination host
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To leave the selection of the destination host to the Compute service, use the
nova command-line client.
#. Obtain the instance ID as shown in step 1 of the section
:ref:`section-manual-selection-of-dest`.
#. Leave out the host selection steps 2, 3, and 4.
#. Migrate the instance:
.. code-block:: console
$ nova live-migration d1df1b5a-70c4-4fed-98b7-423362f2c47c
Monitoring the migration
~~~~~~~~~~~~~~~~~~~~~~~~
#. Confirm that the instance is migrating:
.. code-block:: console
$ openstack server show d1df1b5a-70c4-4fed-98b7-423362f2c47c
+----------------------+--------------------------------------+
| Field | Value |
+----------------------+--------------------------------------+
| ... | ... |
| status | MIGRATING |
| ... | ... |
+----------------------+--------------------------------------+
#. Check progress
Use the nova command-line client for nova's migration monitoring feature.
First, obtain the migration ID:
.. code-block:: console
$ nova server-migration-list d1df1b5a-70c4-4fed-98b7-423362f2c47c
+----+-------------+----------- (...)
| Id | Source Node | Dest Node | (...)
+----+-------------+-----------+ (...)
| 2 | - | - | (...)
+----+-------------+-----------+ (...)
For readability, most output columns were removed. Only the first column,
**Id**, is relevant. In this example, the migration ID is 2. Use this to
get the migration status.
.. code-block:: console
$ nova server-migration-show d1df1b5a-70c4-4fed-98b7-423362f2c47c 2
+------------------------+--------------------------------------+
| Property | Value |
+------------------------+--------------------------------------+
| created_at | 2017-03-08T02:53:06.000000 |
| dest_compute | controller |
| dest_host | - |
| dest_node | - |
| disk_processed_bytes | 0 |
| disk_remaining_bytes | 0 |
| disk_total_bytes | 0 |
| id | 2 |
| memory_processed_bytes | 65502513 |
| memory_remaining_bytes | 786427904 |
| memory_total_bytes | 1091379200 |
| server_uuid | d1df1b5a-70c4-4fed-98b7-423362f2c47c |
| source_compute | compute2 |
| source_node | - |
| status | running |
| updated_at | 2017-03-08T02:53:47.000000 |
+------------------------+--------------------------------------+
The output shows that the migration is running. Progress is measured by the
number of memory bytes that remain to be copied. If this number is not
decreasing over time, the migration may be unable to complete, and it may be
aborted by the Compute service.
.. note::
The command reports that no disk bytes are processed, even in the event
of block migration.
What to do when the migration times out
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
During the migration process, the instance may write to a memory page after
that page has been copied to the destination. When that happens, the same page
has to be copied again. The instance may write to memory pages faster than they
can be copied, so that the migration cannot complete. The Compute service will
cancel it when the ``live_migration_completion_timeout``, a configuration
parameter, is reached.
The following remarks assume the KVM/Libvirt hypervisor.
How to know that the migration timed out
----------------------------------------
To determine that the migration timed out, inspect the ``nova-compute`` log
file on the source host. The following log entry shows that the migration timed
out:
.. code-block:: console
# grep WARNING.*d1df1b5a-70c4-4fed-98b7-423362f2c47c /var/log/nova/nova-compute.log
...
WARNING nova.virt.libvirt.migration [req-...] [instance: ...]
live migration not completed after 1800 sec
The Compute service also cancels migrations when the memory copy seems to make
no progress. Ocata disables this feature by default, but it can be enabled
using the configuration parameter ``live_migration_progress_timeout``. Should
this be the case, you may find the following message in the log:
.. code-block:: console
WARNING nova.virt.libvirt.migration [req-...] [instance: ...]
live migration stuck for 150 sec
Addressing migration timeouts
-----------------------------
To stop the migration from putting load on infrastructure resources like
network and disks, you may opt to cancel it manually.
.. code-block:: console
$ nova live-migration-abort INSTANCE_ID MIGRATION_ID
To make live-migration succeed, you have several options:
- **Manually force-complete the migration**
.. code-block:: console
$ nova live-migration-force-complete INSTANCE_ID MIGRATION_ID
The instance is paused until memory copy completes.
.. caution::
Since the pause impacts time keeping on the instance and not all
applications tolerate incorrect time settings, use this approach with
caution.
- **Enable auto-convergence**
Auto-convergence is a Libvirt feature. Libvirt detects that the migration is
unlikely to complete and slows down its CPU until the memory copy process is
faster than the instance's memory writes.
To enable auto-convergence, set
``live_migration_permit_auto_convergence=true`` in ``nova.conf`` and restart
``nova-compute``. Do this on all compute hosts.
.. caution::
One possible downside of auto-convergence is the slowing down of the
instance.
- **Enable post-copy**
This is a Libvirt feature. Libvirt detects that the migration does not
progress and responds by activating the virtual machine on the destination
host before all its memory has been copied. Access to missing memory pages
result in page faults that are satisfied from the source host.
To enable post-copy, set ``live_migration_permit_post_copy=true`` in
``nova.conf`` and restart ``nova-compute``. Do this on all compute hosts.
When post-copy is enabled, manual force-completion does not pause the
instance but switches to the post-copy process.
.. caution::
Possible downsides:
- When the network connection between source and destination is
interrupted, page faults cannot be resolved anymore, and the virtual
machine is rebooted.
- Post-copy may lead to an increased page fault rate during migration,
which can slow the instance down.

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=======
Logging
=======
Logging module
~~~~~~~~~~~~~~
Logging behavior can be changed by creating a configuration file. To specify
the configuration file, add this line to the ``/etc/nova/nova.conf`` file:
.. code-block:: ini
log-config=/etc/nova/logging.conf
To change the logging level, add ``DEBUG``, ``INFO``, ``WARNING``, or ``ERROR``
as a parameter.
The logging configuration file is an INI-style configuration file, which must
contain a section called ``logger_nova``. This controls the behavior of the
logging facility in the ``nova-*`` services. For example:
.. code-block:: ini
[logger_nova]
level = INFO
handlers = stderr
qualname = nova
This example sets the debugging level to ``INFO`` (which is less verbose than
the default ``DEBUG`` setting).
For more about the logging configuration syntax, including the ``handlers`` and
``quaname`` variables, see the `Python documentation
<https://docs.python.org/release/2.7/library/logging.html#configuration-file-format>`__
on logging configuration files.
For an example of the ``logging.conf`` file with various defined handlers, see
the `OpenStack Configuration Reference
<https://docs.openstack.org/ocata/config-reference/>`__.
Syslog
~~~~~~
OpenStack Compute services can send logging information to syslog. This is
useful if you want to use rsyslog to forward logs to a remote machine.
Separately configure the Compute service (nova), the Identity service
(keystone), the Image service (glance), and, if you are using it, the Block
Storage service (cinder) to send log messages to syslog. Open these
configuration files:
- ``/etc/nova/nova.conf``
- ``/etc/keystone/keystone.conf``
- ``/etc/glance/glance-api.conf``
- ``/etc/glance/glance-registry.conf``
- ``/etc/cinder/cinder.conf``
In each configuration file, add these lines:
.. code-block:: ini
debug = False
use_syslog = True
syslog_log_facility = LOG_LOCAL0
In addition to enabling syslog, these settings also turn off debugging output
from the log.
.. note::
Although this example uses the same local facility for each service
(``LOG_LOCAL0``, which corresponds to syslog facility ``LOCAL0``), we
recommend that you configure a separate local facility for each service, as
this provides better isolation and more flexibility. For example, you can
capture logging information at different severity levels for different
services. syslog allows you to define up to eight local facilities,
``LOCAL0, LOCAL1, ..., LOCAL7``. For more information, see the syslog
documentation.
Rsyslog
~~~~~~~
rsyslog is useful for setting up a centralized log server across multiple
machines. This section briefly describe the configuration to set up an rsyslog
server. A full treatment of rsyslog is beyond the scope of this book. This
section assumes rsyslog has already been installed on your hosts (it is
installed by default on most Linux distributions).
This example provides a minimal configuration for ``/etc/rsyslog.conf`` on the
log server host, which receives the log files
.. code-block:: console
# provides TCP syslog reception
$ModLoad imtcp
$InputTCPServerRun 1024
Add a filter rule to ``/etc/rsyslog.conf`` which looks for a host name. This
example uses COMPUTE_01 as the compute host name:
.. code-block:: none
:hostname, isequal, "COMPUTE_01" /mnt/rsyslog/logs/compute-01.log
On each compute host, create a file named ``/etc/rsyslog.d/60-nova.conf``, with
the following content:
.. code-block:: none
# prevent debug from dnsmasq with the daemon.none parameter
*.*;auth,authpriv.none,daemon.none,local0.none -/var/log/syslog
# Specify a log level of ERROR
local0.error @@172.20.1.43:1024
Once you have created the file, restart the ``rsyslog`` service. Error-level
log messages on the compute hosts should now be sent to the log server.
Serial console
~~~~~~~~~~~~~~
The serial console provides a way to examine kernel output and other system
messages during troubleshooting if the instance lacks network connectivity.
Read-only access from server serial console is possible using the
``os-GetSerialOutput`` server action. Most cloud images enable this feature by
default. For more information, see :ref:`compute-common-errors-and-fixes`.
OpenStack Juno and later supports read-write access using the serial console
using the ``os-GetSerialConsole`` server action. This feature also requires a
websocket client to access the serial console.
.. rubric:: Configuring read-write serial console access
#. On a compute node, edit the ``/etc/nova/nova.conf`` file:
In the ``[serial_console]`` section, enable the serial console:
.. code-block:: ini
[serial_console]
# ...
enabled = true
#. In the ``[serial_console]`` section, configure the serial console proxy
similar to graphical console proxies:
.. code-block:: ini
[serial_console]
# ...
base_url = ws://controller:6083/
listen = 0.0.0.0
proxyclient_address = MANAGEMENT_INTERFACE_IP_ADDRESS
The ``base_url`` option specifies the base URL that clients receive from the
API upon requesting a serial console. Typically, this refers to the host
name of the controller node.
The ``listen`` option specifies the network interface nova-compute should
listen on for virtual console connections. Typically, 0.0.0.0 will enable
listening on all interfaces.
The ``proxyclient_address`` option specifies which network interface the
proxy should connect to. Typically, this refers to the IP address of the
management interface.
When you enable read-write serial console access, Compute will add serial
console information to the Libvirt XML file for the instance. For example:
.. code-block:: xml
<console type='tcp'>
<source mode='bind' host='127.0.0.1' service='10000'/>
<protocol type='raw'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
.. rubric:: Accessing the serial console on an instance
#. Use the :command:`nova get-serial-proxy` command to retrieve the websocket
URL for the serial console on the instance:
.. code-block:: console
$ nova get-serial-proxy INSTANCE_NAME
.. list-table::
:header-rows: 0
:widths: 9 65
* - Type
- Url
* - serial
- ws://127.0.0.1:6083/?token=18510769-71ad-4e5a-8348-4218b5613b3d
Alternatively, use the API directly:
.. code-block:: console
$ curl -i 'http://<controller>:8774/v2.1/<tenant_uuid>/servers/<instance_uuid>/action' \
-X POST \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-H "X-Auth-Project-Id: <project_id>" \
-H "X-Auth-Token: <auth_token>" \
-d '{"os-getSerialConsole": {"type": "serial"}}'
#. Use Python websocket with the URL to generate ``.send``, ``.recv``, and
``.fileno`` methods for serial console access. For example:
.. code-block:: python
import websocket
ws = websocket.create_connection(
'ws://127.0.0.1:6083/?token=18510769-71ad-4e5a-8348-4218b5613b3d',
subprotocols=['binary', 'base64'])
Alternatively, use a `Python websocket client
<https://github.com/larsks/novaconsole/>`__.
.. note::
When you enable the serial console, typical instance logging using the
:command:`nova console-log` command is disabled. Kernel output and other
system messages will not be visible unless you are actively viewing the
serial console.

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.. _section_manage-the-cloud:
================
Manage the cloud
================
.. toctree::
euca2ools.rst
common/nova-show-usage-statistics-for-hosts-instances.rst
System administrators can use the :command:`openstack` and :command:`euca2ools`
commands to manage their clouds.
The ``openstack`` client and ``euca2ools`` can be used by all users, though
specific commands might be restricted by the Identity service.
**Managing the cloud with the openstack client**
#. The ``python-openstackclient`` package provides an ``openstack`` shell that
enables Compute API interactions from the command line. Install the client,
and provide your user name and password (which can be set as environment
variables for convenience), for the ability to administer the cloud from the
command line.
To install python-openstackclient, follow the instructions in the `OpenStack
User Guide
<https://docs.openstack.org/user-guide/common/cli-install-openstack-command-line-clients.html>`_.
#. Confirm the installation was successful:
.. code-block:: console
$ openstack help
usage: openstack [--version] [-v | -q] [--log-file LOG_FILE] [-h] [--debug]
[--os-cloud <cloud-config-name>]
[--os-region-name <auth-region-name>]
[--os-cacert <ca-bundle-file>] [--verify | --insecure]
[--os-default-domain <auth-domain>]
...
Running :command:`openstack help` returns a list of ``openstack`` commands
and parameters. To get help for a subcommand, run:
.. code-block:: console
$ openstack help SUBCOMMAND
For a complete list of ``openstack`` commands and parameters, see the
`OpenStack Command-Line Reference
<https://docs.openstack.org/cli-reference/openstack.html>`__.
#. Set the required parameters as environment variables to make running
commands easier. For example, you can add ``--os-username`` as an
``openstack`` option, or set it as an environment variable. To set the user
name, password, and project as environment variables, use:
.. code-block:: console
$ export OS_USERNAME=joecool
$ export OS_PASSWORD=coolword
$ export OS_TENANT_NAME=coolu
#. The Identity service gives you an authentication endpoint, which Compute
recognizes as ``OS_AUTH_URL``:
.. code-block:: console
$ export OS_AUTH_URL=http://hostname:5000/v2.0

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.. _section_manage-compute-users:
====================
Manage Compute users
====================
Access to the Euca2ools (ec2) API is controlled by an access key and a secret
key. The user's access key needs to be included in the request, and the request
must be signed with the secret key. Upon receipt of API requests, Compute
verifies the signature and runs commands on behalf of the user.
To begin using Compute, you must create a user with the Identity service.

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==============
Manage volumes
==============
Depending on the setup of your cloud provider, they may give you an endpoint to
use to manage volumes, or there may be an extension under the covers. In either
case, you can use the ``openstack`` CLI to manage volumes.
.. list-table:: **openstack volume commands**
:header-rows: 1
* - Command
- Description
* - server add volume
- Attach a volume to a server.
* - volume create
- Add a new volume.
* - volume delete
- Remove or delete a volume.
* - server remove volume
- Detach or remove a volume from a server.
* - volume list
- List all the volumes.
* - volume show
- Show details about a volume.
* - snapshot create
- Add a new snapshot.
* - snapshot delete
- Remove a snapshot.
* - snapshot list
- List all the snapshots.
* - snapshot show
- Show details about a snapshot.
* - volume type create
- Create a new volume type.
* - volume type delete
- Delete a specific flavor
* - volume type list
- Print a list of available 'volume types'.
|
For example, to list IDs and names of volumes, run:
.. code-block:: console
$ openstack volume list
+--------+--------------+-----------+------+-------------+
| ID | Display Name | Status | Size | Attached to |
+--------+--------------+-----------+------+-------------+
| 86e6cb | testnfs | available | 1 | |
| e389f7 | demo | available | 1 | |
+--------+--------------+-----------+------+-------------+

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==================================
Recover from a failed compute node
==================================
If you deploy Compute with a shared file system, you can use several methods to
quickly recover from a node failure. This section discusses manual recovery.
Evacuate instances
~~~~~~~~~~~~~~~~~~
If a hardware malfunction or other error causes the cloud compute node to fail,
you can use the :command:`nova evacuate` command to evacuate instances. See
the `OpenStack Administrator Guide
<https://docs.openstack.org/admin-guide/cli-nova-evacuate.html>`__.
.. _nova-compute-node-down-manual-recovery:
Manual recovery
~~~~~~~~~~~~~~~
To manually recover a failed compute node:
#. Identify the VMs on the affected hosts by using a combination of the
:command:`openstack server list` and :command:`openstack server show`
commands or the :command:`euca-describe-instances` command.
For example, this command displays information about the i-000015b9 instance
that runs on the np-rcc54 node:
.. code-block:: console
$ euca-describe-instances
i-000015b9 at3-ui02 running nectarkey (376, np-rcc54) 0 m1.xxlarge 2012-06-19T00:48:11.000Z 115.146.93.60
#. Query the Compute database for the status of the host. This example converts
an EC2 API instance ID to an OpenStack ID. If you use the :command:`nova`
commands, you can substitute the ID directly. This example output is
truncated:
.. code-block:: none
mysql> SELECT * FROM instances WHERE id = CONV('15b9', 16, 10) \G;
*************************** 1. row ***************************
created_at: 2012-06-19 00:48:11
updated_at: 2012-07-03 00:35:11
deleted_at: NULL
...
id: 5561
...
power_state: 5
vm_state: shutoff
...
hostname: at3-ui02
host: np-rcc54
...
uuid: 3f57699a-e773-4650-a443-b4b37eed5a06
...
task_state: NULL
...
.. note::
Find the credentials for your database in ``/etc/nova.conf`` file.
#. Decide to which compute host to move the affected VM. Run this database
command to move the VM to that host:
.. code-block:: mysql
mysql> UPDATE instances SET host = 'np-rcc46' WHERE uuid = '3f57699a-e773-4650-a443-b4b37eed5a06';
#. If you use a hypervisor that relies on libvirt, such as KVM, update the
``libvirt.xml`` file in ``/var/lib/nova/instances/[instance ID]`` with these
changes:
- Change the ``DHCPSERVER`` value to the host IP address of the new compute
host.
- Update the VNC IP to ``0.0.0.0``.
#. Reboot the VM:
.. code-block:: console
$ openstack server reboot 3f57699a-e773-4650-a443-b4b37eed5a06
Typically, the database update and :command:`openstack server reboot` command
recover a VM from a failed host. However, if problems persist, try one of these
actions:
- Use :command:`virsh` to recreate the network filter configuration.
- Restart Compute services.
- Update the ``vm_state`` and ``power_state`` fields in the Compute database.
Recover from a UID/GID mismatch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sometimes when you run Compute with a shared file system or an automated
configuration tool, files on your compute node might use the wrong UID or GID.
This UID or GID mismatch can prevent you from running live migrations or
starting virtual machines.
This procedure runs on ``nova-compute`` hosts, based on the KVM hypervisor:
#. Set the nova UID to the same number in ``/etc/passwd`` on all hosts. For
example, set the UID to ``112``.
.. note::
Choose UIDs or GIDs that are not in use for other users or groups.
#. Set the ``libvirt-qemu`` UID to the same number in the ``/etc/passwd`` file
on all hosts. For example, set the UID to ``119``.
#. Set the ``nova`` group to the same number in the ``/etc/group`` file on all
hosts. For example, set the group to ``120``.
#. Set the ``libvirtd`` group to the same number in the ``/etc/group`` file on
all hosts. For example, set the group to ``119``.
#. Stop the services on the compute node.
#. Change all files that the nova user or group owns. For example:
.. code-block:: console
# find / -uid 108 -exec chown nova {} \;
# note the 108 here is the old nova UID before the change
# find / -gid 120 -exec chgrp nova {} \;
#. Repeat all steps for the ``libvirt-qemu`` files, if required.
#. Restart the services.
#. To verify that all files use the correct IDs, run the :command:`find`
command.
Recover cloud after disaster
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This section describes how to manage your cloud after a disaster and back up
persistent storage volumes. Backups are mandatory, even outside of disaster
scenarios.
For a definition of a disaster recovery plan (DRP), see
`https://en.wikipedia.org/wiki/Disaster\_Recovery\_Plan
<https://en.wikipedia.org/wiki/Disaster_Recovery_Plan>`_.
A disk crash, network loss, or power failure can affect several components in
your cloud architecture. The worst disaster for a cloud is a power loss. A
power loss affects these components:
- A cloud controller (``nova-api``, ``nova-objectstore``, ``nova-network``)
- A compute node (``nova-compute``)
- A storage area network (SAN) used by OpenStack Block Storage
(``cinder-volumes``)
Before a power loss:
- Create an active iSCSI session from the SAN to the cloud controller (used
for the ``cinder-volumes`` LVM's VG).
- Create an active iSCSI session from the cloud controller to the compute node
(managed by ``cinder-volume``).
- Create an iSCSI session for every volume (so 14 EBS volumes requires 14
iSCSI sessions).
- Create ``iptables`` or ``ebtables`` rules from the cloud controller to the
compute node. This allows access from the cloud controller to the running
instance.
- Save the current state of the database, the current state of the running
instances, and the attached volumes (mount point, volume ID, volume status,
etc), at least from the cloud controller to the compute node.
After power resumes and all hardware components restart:
- The iSCSI session from the SAN to the cloud no longer exists.
- The iSCSI session from the cloud controller to the compute node no longer
exists.
- nova-network reapplies configurations on boot and, as a result, recreates
the iptables and ebtables from the cloud controller to the compute node.
- Instances stop running.
Instances are not lost because neither ``destroy`` nor ``terminate`` ran.
The files for the instances remain on the compute node.
- The database does not update.
.. rubric:: Begin recovery
.. warning::
Do not add any steps or change the order of steps in this procedure.
#. Check the current relationship between the volume and its instance, so that
you can recreate the attachment.
Use the :command:`openstack volume list` command to get this information.
Note that the :command:`openstack` client can get volume information from
OpenStack Block Storage.
#. Update the database to clean the stalled state. Do this for every volume by
using these queries:
.. code-block:: mysql
mysql> use cinder;
mysql> update volumes set mountpoint=NULL;
mysql> update volumes set status="available" where status <>"error_deleting";
mysql> update volumes set attach_status="detached";
mysql> update volumes set instance_id=0;
Use :command:`openstack volume list` command to list all volumes.
#. Restart the instances by using the :command:`openstack server reboot
INSTANCE` command.
.. important::
Some instances completely reboot and become reachable, while some might
stop at the plymouth stage. This is expected behavior. DO NOT reboot a
second time.
Instance state at this stage depends on whether you added an `/etc/fstab`
entry for that volume. Images built with the cloud-init package remain in
a ``pending`` state, while others skip the missing volume and start. You
perform this step to ask Compute to reboot every instance so that the
stored state is preserved. It does not matter if not all instances come
up successfully. For more information about cloud-init, see
`help.ubuntu.com/community/CloudInit/
<https://help.ubuntu.com/community/CloudInit/>`__.
#. If required, run the :command:`openstack server add volume` command to
reattach the volumes to their respective instances. This example uses a file
of listed volumes to reattach them:
.. code-block:: bash
#!/bin/bash
while read line; do
volume=`echo $line | $CUT -f 1 -d " "`
instance=`echo $line | $CUT -f 2 -d " "`
mount_point=`echo $line | $CUT -f 3 -d " "`
echo "ATTACHING VOLUME FOR INSTANCE - $instance"
openstack server add volume $instance $volume $mount_point
sleep 2
done < $volumes_tmp_file
Instances that were stopped at the plymouth stage now automatically continue
booting and start normally. Instances that previously started successfully
can now see the volume.
#. Log in to the instances with SSH and reboot them.
If some services depend on the volume or if a volume has an entry in fstab,
you can now restart the instance. Restart directly from the instance itself
and not through :command:`nova`:
.. code-block:: console
# shutdown -r now
When you plan for and complete a disaster recovery, follow these tips:
- Use the ``errors=remount`` option in the ``fstab`` file to prevent data
corruption.
In the event of an I/O error, this option prevents writes to the disk. Add
this configuration option into the cinder-volume server that performs the
iSCSI connection to the SAN and into the instances' ``fstab`` files.
- Do not add the entry for the SAN's disks to the cinder-volume's ``fstab``
file.
Some systems hang on that step, which means you could lose access to your
cloud-controller. To re-run the session manually, run this command before
performing the mount:
.. code-block:: console
# iscsiadm -m discovery -t st -p $SAN_IP $ iscsiadm -m node --target-name $IQN -p $SAN_IP -l
- On your instances, if you have the whole ``/home/`` directory on the disk,
leave a user's directory with the user's bash files and the
``authorized_keys`` file instead of emptying the ``/home/`` directory and
mapping the disk on it.
This action enables you to connect to the instance without the volume
attached, if you allow only connections through public keys.
To script the disaster recovery plan (DRP), use the `https://github.com/Razique
<https://github.com/Razique/BashStuff/blob/master/SYSTEMS/OpenStack/SCR_5006_V00_NUAC-OPENSTACK-DRP-OpenStack.sh>`_
bash script.
This script completes these steps:
#. Creates an array for instances and their attached volumes.
#. Updates the MySQL database.
#. Restarts all instances with euca2ools.
#. Reattaches the volumes.
#. Uses Compute credentials to make an SSH connection into every instance.
The script includes a ``test mode``, which enables you to perform the sequence
for only one instance.
To reproduce the power loss, connect to the compute node that runs that
instance and close the iSCSI session. Do not detach the volume by using the
:command:`openstack server remove volume` command. You must manually close the
iSCSI session. This example closes an iSCSI session with the number ``15``:
.. code-block:: console
# iscsiadm -m session -u -r 15
Do not forget the ``-r`` option. Otherwise, all sessions close.
.. warning::
There is potential for data loss while running instances during this
procedure. If you are using Liberty or earlier, ensure you have the correct
patch and set the options appropriately.

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========================================
Attaching physical PCI devices to guests
========================================
The PCI passthrough feature in OpenStack allows full access and direct control
of a physical PCI device in guests. This mechanism is generic for any kind of
PCI device, and runs with a Network Interface Card (NIC), Graphics Processing
Unit (GPU), or any other devices that can be attached to a PCI bus. Correct
driver installation is the only requirement for the guest to properly use the
devices.
Some PCI devices provide Single Root I/O Virtualization and Sharing (SR-IOV)
capabilities. When SR-IOV is used, a physical device is virtualized and appears
as multiple PCI devices. Virtual PCI devices are assigned to the same or
different guests. In the case of PCI passthrough, the full physical device is
assigned to only one guest and cannot be shared.
.. note::
For information on attaching virtual SR-IOV devices to guests, refer to the
`Networking Guide`_.
To enable PCI passthrough, follow the steps below:
#. Configure nova-scheduler (Controller)
#. Configure nova-api (Controller)**
#. Configure a flavor (Controller)
#. Enable PCI passthrough (Compute)
#. Configure PCI devices in nova-compute (Compute)
.. note::
The PCI device with address ``0000:41:00.0`` is used as an example. This
will differ between environments.
Configure nova-scheduler (Controller)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#. Configure ``nova-scheduler`` as specified in `Configure nova-scheduler`_.
#. Restart the ``nova-scheduler`` service.
Configure nova-api (Controller)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#. Specify the PCI alias for the device.
Configure a PCI alias ``a1`` to request a PCI device with a ``vendor_id`` of
``0x8086`` and a ``product_id`` of ``0x154d``. The ``vendor_id`` and
``product_id`` correspond the PCI device with address ``0000:41:00.0``.
Edit ``/etc/nova/nova.conf``:
.. code-block:: ini
[default]
pci_alias = { "vendor_id":"8086", "product_id":"154d", "device_type":"type-PF", "name":"a1" }
For more information about the syntax of ``pci_alias``, refer to `nova.conf
configuration options`_.
#. Restart the ``nova-api`` service.
Configure a flavor (Controller)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Configure a flavor to request two PCI devices, each with ``vendor_id`` of
``0x8086`` and ``product_id`` of ``0x154d``:
.. code-block:: console
# openstack flavor set m1.large --property "pci_passthrough:alias"="a1:2"
For more information about the syntax for ``pci_passthrough:alias``, refer to
`flavor`_.
Enable PCI passthrough (Compute)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enable VT-d and IOMMU. For more information, refer to steps one and two in
`Create Virtual Functions`_.
Configure PCI devices (Compute)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#. Configure ``nova-compute`` to allow the PCI device to pass through to
VMs. Edit ``/etc/nova/nova.conf``:
.. code-block:: ini
[default]
pci_passthrough_whitelist = { "address": "0000:41:00.0" }
Alternatively specify multiple PCI devices using whitelisting:
.. code-block:: ini
[default]
pci_passthrough_whitelist = { "vendor_id": "8086", "product_id": "10fb" }
All PCI devices matching the ``vendor_id`` and ``product_id`` are added to
the pool of PCI devices available for passthrough to VMs.
For more information about the syntax of ``pci_passthrough_whitelist``,
refer to `nova.conf configuration options`_.
#. Specify the PCI alias for the device.
From the Newton release, to resize guest with PCI device, configure the PCI
alias on the compute node as well.
Configure a PCI alias ``a1`` to request a PCI device with a ``vendor_id`` of
``0x8086`` and a ``product_id`` of ``0x154d``. The ``vendor_id`` and
``product_id`` correspond the PCI device with address ``0000:41:00.0``.
Edit ``/etc/nova/nova.conf``:
.. code-block:: ini
[default]
pci_alias = { "vendor_id":"8086", "product_id":"154d", "device_type":"type-PF", "name":"a1" }
For more information about the syntax of ``pci_alias``, refer to `nova.conf
configuration options`_.
#. Restart the ``nova-compute`` service.
Create instances with PCI passthrough devices
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The ``nova-scheduler`` selects a destination host that has PCI devices
available with the specified ``vendor_id`` and ``product_id`` that matches the
``pci_alias`` from the flavor.
.. code-block:: console
# openstack server create --flavor m1.large --image cirros-0.3.5-x86_64-uec --wait test-pci
.. Links
.. _`Create Virtual Functions`: https://docs.openstack.org/ocata/networking-guide/config-sriov.html#create-virtual-functions-compute
.. _`Configure nova-scheduler`: https://docs.openstack.org/ocata/networking-guide/config-sriov.html#configure-nova-scheduler-controller
.. _`nova.conf configuration options`: https://docs.openstack.org/ocata/config-reference/compute/config-options.html
.. _`flavor`: https://docs.openstack.org/admin-guide/compute-flavors.html
.. _`Networking Guide`: https://docs.openstack.org/ocata/networking-guide/config-sriov.html

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===============================
Configure remote console access
===============================
To provide a remote console or remote desktop access to guest virtual machines,
use VNC or SPICE HTML5 through either the OpenStack dashboard or the command
line. Best practice is to select one or the other to run.
About nova-consoleauth
~~~~~~~~~~~~~~~~~~~~~~
Both client proxies leverage a shared service to manage token authentication
called ``nova-consoleauth``. This service must be running for either proxy to
work. Many proxies of either type can be run against a single
``nova-consoleauth`` service in a cluster configuration.
Do not confuse the ``nova-consoleauth`` shared service with ``nova-console``,
which is a XenAPI-specific service that most recent VNC proxy architectures do
not use.
SPICE console
~~~~~~~~~~~~~
OpenStack Compute supports VNC consoles to guests. The VNC protocol is fairly
limited, lacking support for multiple monitors, bi-directional audio, reliable
cut-and-paste, video streaming and more. SPICE is a new protocol that aims to
address the limitations in VNC and provide good remote desktop support.
SPICE support in OpenStack Compute shares a similar architecture to the VNC
implementation. The OpenStack dashboard uses a SPICE-HTML5 widget in its
console tab that communicates to the ``nova-spicehtml5proxy`` service by using
SPICE-over-websockets. The ``nova-spicehtml5proxy`` service communicates
directly with the hypervisor process by using SPICE.
VNC must be explicitly disabled to get access to the SPICE console. Set the
``vnc_enabled`` option to ``False`` in the ``[DEFAULT]`` section to disable the
VNC console.
Use the following options to configure SPICE as the console for OpenStack
Compute:
.. code-block:: console
[spice]
agent_enabled = False
enabled = True
html5proxy_base_url = http://IP_ADDRESS:6082/spice_auto.html
html5proxy_host = 0.0.0.0
html5proxy_port = 6082
keymap = en-us
server_listen = 127.0.0.1
server_proxyclient_address = 127.0.0.1
Replace ``IP_ADDRESS`` with the management interface IP address of the
controller or the VIP.
VNC console proxy
~~~~~~~~~~~~~~~~~
The VNC proxy is an OpenStack component that enables compute service users to
access their instances through VNC clients.
.. note::
The web proxy console URLs do not support the websocket protocol scheme
(ws://) on python versions less than 2.7.4.
The VNC console connection works as follows:
#. A user connects to the API and gets an ``access_url`` such as,
``http://ip:port/?token=xyz``.
#. The user pastes the URL in a browser or uses it as a client
parameter.
#. The browser or client connects to the proxy.
#. The proxy talks to ``nova-consoleauth`` to authorize the token for the user,
and maps the token to the *private* host and port of the VNC server for an
instance.
The compute host specifies the address that the proxy should use to connect
through the ``nova.conf`` file option, ``vncserver_proxyclient_address``. In
this way, the VNC proxy works as a bridge between the public network and
private host network.
#. The proxy initiates the connection to VNC server and continues to proxy
until the session ends.
The proxy also tunnels the VNC protocol over WebSockets so that the ``noVNC``
client can talk to VNC servers. In general, the VNC proxy:
- Bridges between the public network where the clients live and the private
network where VNC servers live.
- Mediates token authentication.
- Transparently deals with hypervisor-specific connection details to provide a
uniform client experience.
.. figure:: figures/SCH_5009_V00_NUAC-VNC_OpenStack.png
:alt: noVNC process
:width: 95%
VNC configuration options
-------------------------
To customize the VNC console, use the following configuration options in your
``nova.conf`` file:
.. note::
To support :ref:`live migration <section_configuring-compute-migrations>`,
you cannot specify a specific IP address for ``vncserver_listen``, because
that IP address does not exist on the destination host.
.. list-table:: **Description of VNC configuration options**
:header-rows: 1
:widths: 25 25
* - Configuration option = Default value
- Description
* - **[DEFAULT]**
-
* - ``daemon = False``
- (BoolOpt) Become a daemon (background process)
* - ``key = None``
- (StrOpt) SSL key file (if separate from cert)
* - ``novncproxy_host = 0.0.0.0``
- (StrOpt) Host on which to listen for incoming requests
* - ``novncproxy_port = 6080``
- (IntOpt) Port on which to listen for incoming requests
* - ``record = False``
- (BoolOpt) Record sessions to FILE.[session_number]
* - ``source_is_ipv6 = False``
- (BoolOpt) Source is ipv6
* - ``ssl_only = False``
- (BoolOpt) Disallow non-encrypted connections
* - ``web = /usr/share/spice-html5``
- (StrOpt) Run webserver on same port. Serve files from DIR.
* - **[vmware]**
-
* - ``vnc_port = 5900``
- (IntOpt) VNC starting port
* - ``vnc_port_total = 10000``
- vnc_port_total = 10000
* - **[vnc]**
-
* - enabled = True
- (BoolOpt) Enable VNC related features
* - novncproxy_base_url = http://127.0.0.1:6080/vnc_auto.html
- (StrOpt) Location of VNC console proxy, in the form
"http://127.0.0.1:6080/vnc_auto.html"
* - vncserver_listen = 127.0.0.1
- (StrOpt) IP address on which instance vncservers should listen
* - vncserver_proxyclient_address = 127.0.0.1
- (StrOpt) The address to which proxy clients (like nova-xvpvncproxy)
should connect
* - xvpvncproxy_base_url = http://127.0.0.1:6081/console
- (StrOpt) Location of nova xvp VNC console proxy, in the form
"http://127.0.0.1:6081/console"
.. note::
- The ``vncserver_proxyclient_address`` defaults to ``127.0.0.1``, which is
the address of the compute host that Compute instructs proxies to use when
connecting to instance servers.
- For all-in-one XenServer domU deployments, set this to ``169.254.0.1.``
- For multi-host XenServer domU deployments, set to a ``dom0 management IP``
on the same network as the proxies.
- For multi-host libvirt deployments, set to a host management IP on the
same network as the proxies.
Typical deployment
------------------
A typical deployment has the following components:
- A ``nova-consoleauth`` process. Typically runs on the controller host.
- One or more ``nova-novncproxy`` services. Supports browser-based noVNC
clients. For simple deployments, this service typically runs on the same
machine as ``nova-api`` because it operates as a proxy between the public
network and the private compute host network.
- One or more ``nova-xvpvncproxy`` services. Supports the special Java client
discussed here. For simple deployments, this service typically runs on the
same machine as ``nova-api`` because it acts as a proxy between the public
network and the private compute host network.
- One or more compute hosts. These compute hosts must have correctly configured
options, as follows.
nova-novncproxy (noVNC)
-----------------------
You must install the noVNC package, which contains the ``nova-novncproxy``
service. As root, run the following command:
.. code-block:: console
# apt-get install nova-novncproxy
The service starts automatically on installation.
To restart the service, run:
.. code-block:: console
# service nova-novncproxy restart
The configuration option parameter should point to your ``nova.conf`` file,
which includes the message queue server address and credentials.
By default, ``nova-novncproxy`` binds on ``0.0.0.0:6080``.
To connect the service to your Compute deployment, add the following
configuration options to your ``nova.conf`` file:
- ``vncserver_listen=0.0.0.0``
Specifies the address on which the VNC service should bind. Make sure it is
assigned one of the compute node interfaces. This address is the one used by
your domain file.
.. code-block:: console
<graphics type="vnc" autoport="yes" keymap="en-us" listen="0.0.0.0"/>
.. note::
To use live migration, use the 0.0.0.0 address.
- ``vncserver_proxyclient_address=127.0.0.1``
The address of the compute host that Compute instructs proxies to use when
connecting to instance ``vncservers``.
Frequently asked questions about VNC access to virtual machines
---------------------------------------------------------------
- **Q: What is the difference between ``nova-xvpvncproxy`` and
``nova-novncproxy``?**
A: ``nova-xvpvncproxy``, which ships with OpenStack Compute, is a proxy that
supports a simple Java client. nova-novncproxy uses noVNC to provide VNC
support through a web browser.
- **Q: I want VNC support in the OpenStack dashboard. What services do I
need?**
A: You need ``nova-novncproxy``, ``nova-consoleauth``, and correctly
configured compute hosts.
- **Q: When I use ``nova get-vnc-console`` or click on the VNC tab of the
OpenStack dashboard, it hangs. Why?**
A: Make sure you are running ``nova-consoleauth`` (in addition to
``nova-novncproxy``). The proxies rely on ``nova-consoleauth`` to validate
tokens, and waits for a reply from them until a timeout is reached.
- **Q: My VNC proxy worked fine during my all-in-one test, but now it doesn't
work on multi host. Why?**
A: The default options work for an all-in-one install, but changes must be
made on your compute hosts once you start to build a cluster. As an example,
suppose you have two servers:
.. code-block:: bash
PROXYSERVER (public_ip=172.24.1.1, management_ip=192.168.1.1)
COMPUTESERVER (management_ip=192.168.1.2)
Your ``nova-compute`` configuration file must set the following values:
.. code-block:: console
# These flags help construct a connection data structure
vncserver_proxyclient_address=192.168.1.2
novncproxy_base_url=http://172.24.1.1:6080/vnc_auto.html
xvpvncproxy_base_url=http://172.24.1.1:6081/console
# This is the address where the underlying vncserver (not the proxy)
# will listen for connections.
vncserver_listen=192.168.1.2
.. note::
``novncproxy_base_url`` and ``xvpvncproxy_base_url`` use a public IP; this
is the URL that is ultimately returned to clients, which generally do not
have access to your private network. Your PROXYSERVER must be able to
reach ``vncserver_proxyclient_address``, because that is the address over
which the VNC connection is proxied.
- **Q: My noVNC does not work with recent versions of web browsers. Why?**
A: Make sure you have installed ``python-numpy``, which is required to
support a newer version of the WebSocket protocol (HyBi-07+).
- **Q: How do I adjust the dimensions of the VNC window image in the OpenStack
dashboard?**
A: These values are hard-coded in a Django HTML template. To alter them, edit
the ``_detail_vnc.html`` template file. The location of this file varies
based on Linux distribution. On Ubuntu 14.04, the file is at
``/usr/share/pyshared/horizon/dashboards/nova/instances/templates/instances/_detail_vnc.html``.
Modify the ``width`` and ``height`` options, as follows:
.. code-block:: console
<iframe src="{{ vnc_url }}" width="720" height="430"></iframe>
- **Q: My noVNC connections failed with ValidationError: Origin header protocol
does not match. Why?**
A: Make sure the ``base_url`` match your TLS setting. If you are using https
console connections, make sure that the value of ``novncproxy_base_url`` is
set explicitly where the ``nova-novncproxy`` service is running.

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====================
Secure with rootwrap
====================
Rootwrap allows unprivileged users to safely run Compute actions as the root
user. Compute previously used :command:`sudo` for this purpose, but this was
difficult to maintain, and did not allow advanced filters. The
:command:`rootwrap` command replaces :command:`sudo` for Compute.
To use rootwrap, prefix the Compute command with :command:`nova-rootwrap`. For
example:
.. code-block:: console
$ sudo nova-rootwrap /etc/nova/rootwrap.conf command
A generic ``sudoers`` entry lets the Compute user run :command:`nova-rootwrap`
as root. The :command:`nova-rootwrap` code looks for filter definition
directories in its configuration file, and loads command filters from them. It
then checks if the command requested by Compute matches one of those filters
and, if so, executes the command (as root). If no filter matches, it denies the
request.
.. note::
Be aware of issues with using NFS and root-owned files. The NFS share must
be configured with the ``no_root_squash`` option enabled, in order for
rootwrap to work correctly.
Rootwrap is fully controlled by the root user. The root user owns the sudoers
entry which allows Compute to run a specific rootwrap executable as root, and
only with a specific configuration file (which should also be owned by root).
The :command:`nova-rootwrap` command imports the Python modules it needs from a
cleaned, system-default PYTHONPATH. The root-owned configuration file points
to root-owned filter definition directories, which contain root-owned filters
definition files. This chain ensures that the Compute user itself is not in
control of the configuration or modules used by the :command:`nova-rootwrap`
executable.
Configure rootwrap
~~~~~~~~~~~~~~~~~~
Configure rootwrap in the ``rootwrap.conf`` file. Because it is in the trusted
security path, it must be owned and writable by only the root user. The
``rootwrap_config=entry`` parameter specifies the file's location in the
sudoers entry and in the ``nova.conf`` configuration file.
The ``rootwrap.conf`` file uses an INI file format with these sections and
parameters:
.. list-table:: **rootwrap.conf configuration options**
:widths: 64 31
* - Configuration option=Default value
- (Type) Description
* - [DEFAULT]
filters\_path=/etc/nova/rootwrap.d,/usr/share/nova/rootwrap
- (ListOpt) Comma-separated list of directories
containing filter definition files.
Defines where rootwrap filters are stored.
Directories defined on this line should all
exist, and be owned and writable only by the
root user.
If the root wrapper is not performing correctly, you can add a workaround
option into the ``nova.conf`` configuration file. This workaround re-configures
the root wrapper configuration to fall back to running commands as ``sudo``,
and is a Kilo release feature.
Including this workaround in your configuration file safeguards your
environment from issues that can impair root wrapper performance. Tool changes
that have impacted `Python Build Reasonableness (PBR)
<https://git.openstack.org/cgit/openstack-dev/pbr/>`__ for example, are a known
issue that affects root wrapper performance.
To set up this workaround, configure the ``disable_rootwrap`` option in the
``[workaround]`` section of the ``nova.conf`` configuration file.
The filters definition files contain lists of filters that rootwrap will use to
allow or deny a specific command. They are generally suffixed by ``.filters`` .
Since they are in the trusted security path, they need to be owned and writable
only by the root user. Their location is specified in the ``rootwrap.conf``
file.
Filter definition files use an INI file format with a ``[Filters]`` section and
several lines, each with a unique parameter name, which should be different for
each filter you define:
.. list-table:: **Filters configuration options**
:widths: 72 39
* - Configuration option=Default value
- (Type) Description
* - [Filters]
filter\_name=kpartx: CommandFilter, /sbin/kpartx, root
- (ListOpt) Comma-separated list containing the filter class to
use, followed by the Filter arguments (which vary depending
on the Filter class selected).
Configure the rootwrap daemon
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Administrators can use rootwrap daemon support instead of running rootwrap with
:command:`sudo`. The rootwrap daemon reduces the overhead and performance loss
that results from running ``oslo.rootwrap`` with :command:`sudo`. Each call
that needs rootwrap privileges requires a new instance of rootwrap. The daemon
prevents overhead from the repeated calls. The daemon does not support long
running processes, however.
To enable the rootwrap daemon, set ``use_rootwrap_daemon`` to ``True`` in the
Compute service configuration file.

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==================
Security hardening
==================
OpenStack Compute can be integrated with various third-party technologies to
increase security. For more information, see the `OpenStack Security Guide
<https://docs.openstack.org/security-guide/>`_.
Trusted compute pools
~~~~~~~~~~~~~~~~~~~~~
Administrators can designate a group of compute hosts as trusted using trusted
compute pools. The trusted hosts use hardware-based security features, such as
the Intel Trusted Execution Technology (TXT), to provide an additional level of
security. Combined with an external stand-alone, web-based remote attestation
server, cloud providers can ensure that the compute node runs only software
with verified measurements and can ensure a secure cloud stack.
Trusted compute pools provide the ability for cloud subscribers to request
services run only on verified compute nodes.
The remote attestation server performs node verification like this:
1. Compute nodes boot with Intel TXT technology enabled.
2. The compute node BIOS, hypervisor, and operating system are measured.
3. When the attestation server challenges the compute node, the measured data
is sent to the attestation server.
4. The attestation server verifies the measurements against a known good
database to determine node trustworthiness.
A description of how to set up an attestation service is beyond the scope of
this document. For an open source project that you can use to implement an
attestation service, see the `Open Attestation
<https://github.com/OpenAttestation/OpenAttestation>`__ project.
.. figure:: figures/OpenStackTrustedComputePool1.png
**Configuring Compute to use trusted compute pools**
#. Enable scheduling support for trusted compute pools by adding these lines to
the ``DEFAULT`` section of the ``/etc/nova/nova.conf`` file:
.. code-block:: ini
[DEFAULT]
compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
scheduler_available_filters=nova.scheduler.filters.all_filters
scheduler_default_filters=AvailabilityZoneFilter,RamFilter,ComputeFilter,TrustedFilter
#. Specify the connection information for your attestation service by adding
these lines to the ``trusted_computing`` section of the
``/etc/nova/nova.conf`` file:
.. code-block:: ini
[trusted_computing]
attestation_server = 10.1.71.206
attestation_port = 8443
# If using OAT v2.0 after, use this port:
# attestation_port = 8181
attestation_server_ca_file = /etc/nova/ssl.10.1.71.206.crt
# If using OAT v1.5, use this api_url:
attestation_api_url = /AttestationService/resources
# If using OAT pre-v1.5, use this api_url:
# attestation_api_url = /OpenAttestationWebServices/V1.0
attestation_auth_blob = i-am-openstack
In this example:
``server``
Host name or IP address of the host that runs the attestation service
``port``
HTTPS port for the attestation service
``server_ca_file``
Certificate file used to verify the attestation server's identity
``api_url``
The attestation service's URL path
``auth_blob``
An authentication blob, required by the attestation service.
#. Save the file, and restart the ``nova-compute`` and ``nova-scheduler``
service to pick up the changes.
To customize the trusted compute pools, use these configuration option
settings:
.. list-table:: **Description of trusted computing configuration options**
:header-rows: 2
* - Configuration option = Default value
- Description
* - [trusted_computing]
-
* - attestation_api_url = /OpenAttestationWebServices/V1.0
- (StrOpt) Attestation web API URL
* - attestation_auth_blob = None
- (StrOpt) Attestation authorization blob - must change
* - attestation_auth_timeout = 60
- (IntOpt) Attestation status cache valid period length
* - attestation_insecure_ssl = False
- (BoolOpt) Disable SSL cert verification for Attestation service
* - attestation_port = 8443
- (StrOpt) Attestation server port
* - attestation_server = None
- (StrOpt) Attestation server HTTP
* - attestation_server_ca_file = None
- (StrOpt) Attestation server Cert file for Identity verification
**Specifying trusted flavors**
#. Flavors can be designated as trusted using the :command:`openstack flavor
set` command. In this example, the ``m1.tiny`` flavor is being set as
trusted:
.. code-block:: console
$ openstack flavor set --property trusted_host=trusted m1.tiny
#. You can request that your instance is run on a trusted host by specifying a
trusted flavor when booting the instance:
.. code-block:: console
$ openstack server create --flavor m1.tiny \
--key-name myKeypairName --image myImageID newInstanceName
.. figure:: figures/OpenStackTrustedComputePool2.png
Encrypt Compute metadata traffic
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
**Enabling SSL encryption**
OpenStack supports encrypting Compute metadata traffic with HTTPS. Enable SSL
encryption in the ``metadata_agent.ini`` file.
#. Enable the HTTPS protocol.
.. code-block:: ini
nova_metadata_protocol = https
#. Determine whether insecure SSL connections are accepted for Compute metadata
server requests. The default value is ``False``.
.. code-block:: ini
nova_metadata_insecure = False
#. Specify the path to the client certificate.
.. code-block:: ini
nova_client_cert = PATH_TO_CERT
#. Specify the path to the private key.
.. code-block:: ini
nova_client_priv_key = PATH_TO_KEY

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================================
Configure Compute service groups
================================
The Compute service must know the status of each compute node to effectively
manage and use them. This can include events like a user launching a new VM,
the scheduler sending a request to a live node, or a query to the ServiceGroup
API to determine if a node is live.
When a compute worker running the nova-compute daemon starts, it calls the join
API to join the compute group. Any service (such as the scheduler) can query
the group's membership and the status of its nodes. Internally, the
ServiceGroup client driver automatically updates the compute worker status.
.. _database-servicegroup-driver:
Database ServiceGroup driver
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
By default, Compute uses the database driver to track if a node is live. In a
compute worker, this driver periodically sends a ``db update`` command to the
database, saying “I'm OK” with a timestamp. Compute uses a pre-defined
timeout (``service_down_time``) to determine if a node is dead.
The driver has limitations, which can be problematic depending on your
environment. If a lot of compute worker nodes need to be checked, the database
can be put under heavy load, which can cause the timeout to trigger, and a live
node could incorrectly be considered dead. By default, the timeout is 60
seconds. Reducing the timeout value can help in this situation, but you must
also make the database update more frequently, which again increases the
database workload.
The database contains data that is both transient (such as whether the node is
alive) and persistent (such as entries for VM owners). With the ServiceGroup
abstraction, Compute can treat each type separately.
.. _memcache-servicegroup-driver:
Memcache ServiceGroup driver
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The memcache ServiceGroup driver uses memcached, a distributed memory object
caching system that is used to increase site performance. For more details, see
`memcached.org <http://memcached.org/>`_.
To use the memcache driver, you must install memcached. You might already have
it installed, as the same driver is also used for the OpenStack Object Storage
and OpenStack dashboard. To install memcached, see the *Environment ->
Memcached* section in the `Installation Tutorials and Guides
<https://docs.openstack.org/project-install-guide/ocata>`_ depending on your
distribution.
These values in the ``/etc/nova/nova.conf`` file are required on every node for
the memcache driver:
.. code-block:: ini
# Driver for the ServiceGroup service
servicegroup_driver = "mc"
# Memcached servers. Use either a list of memcached servers to use for caching (list value),
# or "<None>" for in-process caching (default).
memcached_servers = <None>
# Timeout; maximum time since last check-in for up service (integer value).
# Helps to define whether a node is dead
service_down_time = 60

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====================
Troubleshoot Compute
====================
Common problems for Compute typically involve misconfigured networking or
credentials that are not sourced properly in the environment. Also, most flat
networking configurations do not enable :command:`ping` or :command:`ssh` from
a compute node to the instances that run on that node. Another common problem
is trying to run 32-bit images on a 64-bit compute node. This section shows
you how to troubleshoot Compute.
Compute service logging
~~~~~~~~~~~~~~~~~~~~~~~
Compute stores a log file for each service in ``/var/log/nova``. For example,
``nova-compute.log`` is the log for the ``nova-compute`` service. You can set
the following options to format log strings for the ``nova.log`` module in the
``nova.conf`` file:
* ``logging_context_format_string``
* ``logging_default_format_string``
If the log level is set to ``debug``, you can also specify
``logging_debug_format_suffix`` to append extra formatting. For information
about what variables are available for the formatter, see `Formatter Objects
<https://docs.python.org/library/logging.html#formatter-objects>`_.
You have two logging options for OpenStack Compute based on configuration
settings. In ``nova.conf``, include the ``logfile`` option to enable logging.
Alternatively you can set ``use_syslog = 1`` so that the nova daemon logs to
syslog.
Guru Meditation reports
~~~~~~~~~~~~~~~~~~~~~~~
A Guru Meditation report is sent by the Compute service upon receipt of the
``SIGUSR2`` signal (``SIGUSR1`` before Mitaka). This report is a
general-purpose error report that includes details about the current state of
the service. The error report is sent to ``stderr``.
For example, if you redirect error output to ``nova-api-err.log`` using
:command:`nova-api 2>/var/log/nova/nova-api-err.log`, resulting in the process
ID 8675, you can then run:
.. code-block:: console
# kill -USR2 8675
This command triggers the Guru Meditation report to be printed to
``/var/log/nova/nova-api-err.log``.
The report has the following sections:
* Package: Displays information about the package to which the process belongs,
including version information.
* Threads: Displays stack traces and thread IDs for each of the threads within
the process.
* Green Threads: Displays stack traces for each of the green threads within the
process (green threads do not have thread IDs).
* Configuration: Lists all configuration options currently accessible through
the CONF object for the current process.
For more information, see `Guru Meditation Reports
<https://docs.openstack.org/developer/nova/devref/gmr.html>`_.
.. _compute-common-errors-and-fixes:
Common errors and fixes for Compute
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The `ask.openstack.org <http://ask.openstack.org>`_ site offers a place to ask
and answer questions, and you can also mark questions as frequently asked
questions. This section describes some errors people have posted previously.
Bugs are constantly being fixed, so online resources are a great way to get the
most up-to-date errors and fixes.
Credential errors, 401, and 403 forbidden errors
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Problem
-------
Missing credentials cause a ``403 forbidden`` error.
Solution
--------
To resolve this issue, use one of these methods:
#. Manual method
Gets the ``novarc`` file from the project ZIP file, saves existing
credentials in case of override, and manually sources the ``novarc`` file.
#. Script method
Generates ``novarc`` from the project ZIP file and sources it for you.
When you run ``nova-api`` the first time, it generates the certificate
authority information, including ``openssl.cnf``. If you start the CA services
before this, you might not be able to create your ZIP file. Restart the
services. When your CA information is available, create your ZIP file.
Also, check your HTTP proxy settings to see whether they cause problems with
``novarc`` creation.
Instance errors
~~~~~~~~~~~~~~~
Problem
-------
Sometimes a particular instance shows ``pending`` or you cannot SSH to it.
Sometimes the image itself is the problem. For example, when you use flat
manager networking, you do not have a DHCP server and certain images do not
support interface injection; you cannot connect to them.
Solution
--------
To fix instance errors use an image that does support this method, such as
Ubuntu, which obtains an IP address correctly with FlatManager network
settings.
To troubleshoot other possible problems with an instance, such as an instance
that stays in a spawning state, check the directory for the particular instance
under ``/var/lib/nova/instances`` on the ``nova-compute`` host and make sure
that these files are present:
* ``libvirt.xml``
* ``disk``
* ``disk-raw``
* ``kernel``
* ``ramdisk``
* ``console.log``, after the instance starts.
If any files are missing, empty, or very small, the ``nova-compute`` service
did not successfully download the images from the Image service.
Also check ``nova-compute.log`` for exceptions. Sometimes they do not appear in
the console output.
Next, check the log file for the instance in the ``/var/log/libvirt/qemu``
directory to see if it exists and has any useful error messages in it.
Finally, from the ``/var/lib/nova/instances`` directory for the instance, see
if this command returns an error:
.. code-block:: console
# virsh create libvirt.xml
Empty log output for Linux instances
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Problem
-------
You can view the log output of running instances from either the
:guilabel:`Log` tab of the dashboard or the output of :command:`nova
console-log`. In some cases, the log output of a running Linux instance will be
empty or only display a single character (for example, the `?` character).
This occurs when the Compute service attempts to retrieve the log output of the
instance via a serial console while the instance itself is not configured to
send output to the console.
Solution
--------
To rectify this, append the following parameters to kernel arguments specified
in the instance's boot loader:
.. code-block:: ini
console=tty0 console=ttyS0,115200n8
Upon rebooting, the instance will be configured to send output to the Compute
service.
Reset the state of an instance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Problem
-------
Instances can remain in an intermediate state, such as ``deleting``.
Solution
--------
You can use the :command:`nova reset-state` command to manually reset the state
of an instance to an error state. You can then delete the instance. For
example:
.. code-block:: console
$ nova reset-state c6bbbf26-b40a-47e7-8d5c-eb17bf65c485
$ openstack server delete c6bbbf26-b40a-47e7-8d5c-eb17bf65c485
You can also use the ``--active`` parameter to force the instance back to an
active state instead of an error state. For example:
.. code-block:: console
$ nova reset-state --active c6bbbf26-b40a-47e7-8d5c-eb17bf65c485
Injection problems
~~~~~~~~~~~~~~~~~~
Problem
-------
Instances may boot slowly, or do not boot. File injection can cause this
problem.
Solution
--------
To disable injection in libvirt, set the following in ``nova.conf``:
.. code-block:: ini
[libvirt]
inject_partition = -2
.. note::
If you have not enabled the configuration drive and you want to make
user-specified files available from the metadata server for to improve
performance and avoid boot failure if injection fails, you must disable
injection.
Disable live snapshotting
~~~~~~~~~~~~~~~~~~~~~~~~~
Problem
-------
Administrators using libvirt version ``1.2.2`` may experience problems with
live snapshot creation. Occasionally, libvirt version ``1.2.2`` fails to create
live snapshots under the load of creating concurrent snapshot.
Solution
--------
To effectively disable the libvirt live snapshotting, until the problem is
resolved, configure the ``disable_libvirt_livesnapshot`` option. You can turn
off the live snapshotting mechanism by setting up its value to ``True`` in the
``[workarounds]`` section of the ``nova.conf`` file:
.. code-block:: ini
[workarounds]
disable_libvirt_livesnapshot = True

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.. _compute-trusted-pools.rst:
=====================
System administration
=====================
.. toctree::
:maxdepth: 2
manage-users.rst
manage-volumes.rst
flavors.rst
default-ports.rst
admin-password-injection.rst
manage-the-cloud.rst
manage-logs.rst
root-wrap-reference.rst
configuring-migrations.rst
live-migration-usage.rst
remote-console-access.rst
service-groups.rst
security.rst
node-down.rst
adv-config.rst
To effectively administer compute, you must understand how the different
installed nodes interact with each other. Compute can be installed in many
different ways using multiple servers, but generally multiple compute nodes
control the virtual servers and a cloud controller node contains the remaining
Compute services.
The Compute cloud works using a series of daemon processes named ``nova-*``
that exist persistently on the host machine. These binaries can all run on the
same machine or be spread out on multiple boxes in a large deployment. The
responsibilities of services and drivers are:
**Services**
``nova-api``
Receives XML requests and sends them to the rest of the system. A WSGI app
routes and authenticates requests. Supports the EC2 and OpenStack APIs. A
``nova.conf`` configuration file is created when Compute is installed.
``nova-cert``
Manages certificates.
``nova-compute``
Manages virtual machines. Loads a Service object, and exposes the public
methods on ComputeManager through a Remote Procedure Call (RPC).
``nova-conductor``
Provides database-access support for compute nodes (thereby reducing security
risks).
``nova-consoleauth``
Manages console authentication.
``nova-objectstore``
A simple file-based storage system for images that replicates most of the S3
API. It can be replaced with OpenStack Image service and either a simple
image manager or OpenStack Object Storage as the virtual machine image
storage facility. It must exist on the same node as ``nova-compute``.
``nova-network``
Manages floating and fixed IPs, DHCP, bridging and VLANs. Loads a Service
object which exposes the public methods on one of the subclasses of
NetworkManager. Different networking strategies are available by changing the
``network_manager`` configuration option to ``FlatManager``,
``FlatDHCPManager``, or ``VLANManager`` (defaults to ``VLANManager`` if
nothing is specified).
``nova-scheduler``
Dispatches requests for new virtual machines to the correct node.
``nova-novncproxy``
Provides a VNC proxy for browsers, allowing VNC consoles to access virtual
machines.
.. note::
Some services have drivers that change how the service implements its core
functionality. For example, the ``nova-compute`` service supports drivers
that let you choose which hypervisor type it can use. ``nova-network`` and
``nova-scheduler`` also have drivers.

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user/vendordata
Administrators Guide
====================
.. toctree::
:maxdepth: 2
admin/index
Indices and tables
==================