6b7377f414
This is 99% obsolete / duplicate / confusing information. Change-Id: Ibabb2c0856bd97a0363ad35f576844f9f7947dd0
247 lines
10 KiB
ReStructuredText
247 lines
10 KiB
ReStructuredText
.. _config-auto-allocation:
|
|
|
|
==========================================
|
|
Automatic allocation of network topologies
|
|
==========================================
|
|
|
|
The auto-allocation feature introduced in Mitaka simplifies the procedure of
|
|
setting up an external connectivity for end-users, and is also known as **Get
|
|
Me A Network**.
|
|
|
|
Previously, a user had to configure a range of networking resources to boot
|
|
a server and get access to the Internet. For example, the following steps
|
|
are required:
|
|
|
|
* Create a network
|
|
* Create a subnet
|
|
* Create a router
|
|
* Uplink the router on an external network
|
|
* Downlink the router on the previously created subnet
|
|
|
|
These steps need to be performed on each logical segment that a VM needs to
|
|
be connected to, and may require networking knowledge the user might not
|
|
have.
|
|
|
|
This feature is designed to automate the basic networking provisioning for
|
|
projects. The steps to provision a basic network are run during instance
|
|
boot, making the networking setup hands-free.
|
|
|
|
To make this possible, provide a default external network and default
|
|
subnetpools (one for IPv4, or one for IPv6, or one of each) so that the
|
|
Networking service can choose what to do in lieu of input. Once these are in
|
|
place, users can boot their VMs without specifying any networking details.
|
|
The Compute service will then use this feature automatically to wire user
|
|
VMs.
|
|
|
|
Enabling the deployment for auto-allocation
|
|
-------------------------------------------
|
|
|
|
To use this feature, the neutron service must have the following extensions
|
|
enabled:
|
|
|
|
* ``auto-allocated-topology``
|
|
* ``subnet_allocation``
|
|
* ``external-net``
|
|
* ``router``
|
|
|
|
Before the end-user can use the auto-allocation feature, the operator must
|
|
create the resources that will be used for the auto-allocated network
|
|
topology creation. To perform this task, proceed with the following steps:
|
|
|
|
#. Set up a default external network
|
|
|
|
Assuming the external network to be used for the auto-allocation feature
|
|
is named ``public``, make it the ``default`` external network
|
|
with the following command:
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack network set public --default
|
|
|
|
.. note::
|
|
|
|
The flag ``--default`` (and ``--no-default`` flag) is only effective
|
|
with external networks and has no effects on regular (or internal)
|
|
networks.
|
|
|
|
#. Create default subnetpools
|
|
|
|
The auto-allocation feature requires at least one default
|
|
subnetpool. One for IPv4, or one for IPv6, or one of each.
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack subnet pool create --share --default \
|
|
--pool-prefix 192.0.2.0/24 --default-prefix-length 26 \
|
|
shared-default
|
|
|
|
+-------------------+--------------------------------------+
|
|
| Field | Value |
|
|
+-------------------+--------------------------------------+
|
|
| address_scope_id | None |
|
|
| created_at | 2017-01-12T15:10:34Z |
|
|
| default_prefixlen | 26 |
|
|
| default_quota | None |
|
|
| description | |
|
|
| headers | |
|
|
| id | b41b7b9c-de57-4c19-b1c5-731985bceb7f |
|
|
| ip_version | 4 |
|
|
| is_default | True |
|
|
| max_prefixlen | 32 |
|
|
| min_prefixlen | 8 |
|
|
| name | shared-default |
|
|
| prefixes | 192.0.2.0/24 |
|
|
| project_id | 86acdbd1d72745fd8e8320edd7543400 |
|
|
| revision_number | 1 |
|
|
| shared | True |
|
|
| tags | [] |
|
|
| updated_at | 2017-01-12T15:10:34Z |
|
|
+-------------------+--------------------------------------+
|
|
|
|
$ openstack subnet pool create --share --default \
|
|
--pool-prefix 2001:db8:8000::/48 --default-prefix-length 64 \
|
|
default-v6
|
|
|
|
+-------------------+--------------------------------------+
|
|
| Field | Value |
|
|
+-------------------+--------------------------------------+
|
|
| address_scope_id | None |
|
|
| created_at | 2017-01-12T15:14:35Z |
|
|
| default_prefixlen | 64 |
|
|
| default_quota | None |
|
|
| description | |
|
|
| headers | |
|
|
| id | 6f387016-17f0-4564-96ad-e34775b6ea14 |
|
|
| ip_version | 6 |
|
|
| is_default | True |
|
|
| max_prefixlen | 128 |
|
|
| min_prefixlen | 64 |
|
|
| name | default-v6 |
|
|
| prefixes | 2001:db8:8000::/48 |
|
|
| project_id | 86acdbd1d72745fd8e8320edd7543400 |
|
|
| revision_number | 1 |
|
|
| shared | True |
|
|
| tags | [] |
|
|
| updated_at | 2017-01-12T15:14:35Z |
|
|
+-------------------+--------------------------------------+
|
|
|
|
Get Me A Network
|
|
----------------
|
|
|
|
In a deployment where the operator has set up the resources as described above,
|
|
they can get or create their auto-allocated network topology as follows:
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack network auto allocated topology create --or-show
|
|
+------------+--------------------------------------+
|
|
| Field | Value |
|
|
+------------+--------------------------------------+
|
|
| id | a380c780-d6cd-4510-a4c0-1a6ec9b85a29 |
|
|
| project_id | cfd1889ac7d64ad891d4f20aef9f8d7c |
|
|
+------------+--------------------------------------+
|
|
|
|
.. note::
|
|
|
|
When the ``--or-show`` option is used the command returns the topology
|
|
information if it already exists, or creates it if it does not.
|
|
|
|
Operators (and users with admin role) can get or create the auto-allocated
|
|
topology for a project by specifying the project ID:
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack network auto allocated topology create --project \
|
|
cfd1889ac7d64ad891d4f20aef9f8d7c --or-show
|
|
+------------+--------------------------------------+
|
|
| Field | Value |
|
|
+------------+--------------------------------------+
|
|
| id | a380c780-d6cd-4510-a4c0-1a6ec9b85a29 |
|
|
| project_id | cfd1889ac7d64ad891d4f20aef9f8d7c |
|
|
+------------+--------------------------------------+
|
|
|
|
The ID returned by this command is a network which can be used for booting
|
|
a VM.
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack server create --flavor m1.small --image \
|
|
cirros-0.3.5-x86_64-uec --nic \
|
|
net-id=8b835bfb-cae2-4acc-b53f-c16bb5f9a7d0 vm1
|
|
|
|
The auto-allocated topology for a user never changes. In practice, when a user
|
|
boots a server omitting the ``--nic`` option, and there is more than one
|
|
network available, the Compute service will invoke the API behind
|
|
``auto allocated topology create``, fetch the network UUID, and pass it on
|
|
during the boot process.
|
|
|
|
Alternately one can delete their auto-allocated network topology as follows:
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack network auto allocated topology delete
|
|
|
|
Validating the requirements for auto-allocation
|
|
-----------------------------------------------
|
|
|
|
To validate that the required resources are correctly set up for
|
|
auto-allocation, without actually provisioning anything, use
|
|
the ``--check-resources`` option:
|
|
|
|
.. code-block:: console
|
|
|
|
$ openstack network auto allocated topology create --check-resources
|
|
Deployment error: No default router:external network.
|
|
|
|
$ openstack network set public --default
|
|
|
|
$ openstack network auto allocated topology create --check-resources
|
|
Deployment error: No default subnetpools defined.
|
|
|
|
$ openstack subnet pool set shared-default --default
|
|
|
|
$ openstack network auto allocated topology create --check-resources
|
|
+---------+-------+
|
|
| Field | Value |
|
|
+---------+-------+
|
|
| dry-run | pass |
|
|
+---------+-------+
|
|
|
|
The validation option behaves identically for all users. However, it
|
|
is considered primarily an admin or service utility since it is the
|
|
operator who must set up the requirements.
|
|
|
|
Project resources created by auto-allocation
|
|
--------------------------------------------
|
|
|
|
The auto-allocation feature creates one network topology in every project
|
|
where it is used. The auto-allocated network topology for a project contains
|
|
the following resources:
|
|
|
|
+--------------------+------------------------------+
|
|
|Resource |Name |
|
|
+====================+==============================+
|
|
|network |``auto_allocated_network`` |
|
|
+--------------------+------------------------------+
|
|
|subnet (IPv4) |``auto_allocated_subnet_v4`` |
|
|
+--------------------+------------------------------+
|
|
|subnet (IPv6) |``auto_allocated_subnet_v6`` |
|
|
+--------------------+------------------------------+
|
|
|router |``auto_allocated_router`` |
|
|
+--------------------+------------------------------+
|
|
|
|
Compatibility notes
|
|
-------------------
|
|
|
|
Nova uses the ``auto allocated topology`` feature with API micro
|
|
version 2.37 or later. This is because, unlike the neutron feature
|
|
which was implemented in the Mitaka release, the integration for
|
|
nova was completed during the Newton release cycle. Note that
|
|
the CLI option ``--nic`` can be omitted regardless of the microversion
|
|
used as long as there is no more than one network available to the
|
|
project, in which case nova fails with a 400 error because it
|
|
does not know which network to use. Furthermore, nova does not start
|
|
using the feature, regardless of whether or not a user requests
|
|
micro version 2.37 or later, unless all of the ``nova-compute``
|
|
services are running Newton-level code.
|