Install and configure a compute node for Ubuntu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This section describes how to install and configure the Compute service on a compute node. The service supports several hypervisors to deploy instances or virtual machines (VMs). For simplicity, this configuration uses the Quick EMUlator (QEMU) hypervisor with the kernel-based VM (KVM) extension on compute nodes that support hardware acceleration for virtual machines. On legacy hardware, this configuration uses the generic QEMU hypervisor. You can follow these instructions with minor modifications to horizontally scale your environment with additional compute nodes. .. note:: This section assumes that you are following the instructions in this guide step-by-step to configure the first compute node. If you want to configure additional compute nodes, prepare them in a similar fashion to the first compute node in the :ref:`example architectures ` section. Each additional compute node requires a unique IP address. Install and configure components -------------------------------- .. include:: shared/note_configuration_vary_by_distribution.rst #. Install the packages: .. code-block:: console # apt install nova-compute 2. Edit the ``/etc/nova/nova.conf`` file and complete the following actions: * In the ``[DEFAULT]`` section, configure ``RabbitMQ`` message queue access: .. path /etc/nova/nova.conf .. code-block:: ini [DEFAULT] # ... transport_url = rabbit://openstack:RABBIT_PASS@controller Replace ``RABBIT_PASS`` with the password you chose for the ``openstack`` account in ``RabbitMQ``. * In the ``[api]`` and ``[keystone_authtoken]`` sections, configure Identity service access: .. path /etc/nova/nova.conf .. code-block:: ini [api] # ... auth_strategy = keystone [keystone_authtoken] # ... auth_url = http://controller:5000/v3 memcached_servers = controller:11211 auth_type = password project_domain_name = default user_domain_name = default project_name = service username = nova password = NOVA_PASS Replace ``NOVA_PASS`` with the password you chose for the ``nova`` user in the Identity service. .. note:: Comment out or remove any other options in the ``[keystone_authtoken]`` section. * In the ``[DEFAULT]`` section, configure the ``my_ip`` option: .. path /etc/nova/nova.conf .. code-block:: ini [DEFAULT] # ... my_ip = MANAGEMENT_INTERFACE_IP_ADDRESS Replace ``MANAGEMENT_INTERFACE_IP_ADDRESS`` with the IP address of the management network interface on your compute node, typically 10.0.0.31 for the first node in the :ref:`example architecture `. * In the ``[DEFAULT]`` section, enable support for the Networking service: .. path /etc/nova/nova.conf .. code-block:: ini [DEFAULT] # ... use_neutron = true firewall_driver = nova.virt.firewall.NoopFirewallDriver .. note:: By default, Compute uses an internal firewall service. Since Networking includes a firewall service, you must disable the Compute firewall service by using the ``nova.virt.firewall.NoopFirewallDriver`` firewall driver. * Configure the ``[neutron]`` section of **/etc/nova/nova.conf**. Refer to the :neutron-doc:`Networking service install guide ` for more details. * In the ``[vnc]`` section, enable and configure remote console access: .. path /etc/nova/nova.conf .. code-block:: ini [vnc] # ... enabled = true server_listen = 0.0.0.0 server_proxyclient_address = $my_ip novncproxy_base_url = http://controller:6080/vnc_auto.html The server component listens on all IP addresses and the proxy component only listens on the management interface IP address of the compute node. The base URL indicates the location where you can use a web browser to access remote consoles of instances on this compute node. .. note:: If the web browser to access remote consoles resides on a host that cannot resolve the ``controller`` hostname, you must replace ``controller`` with the management interface IP address of the controller node. * In the ``[glance]`` section, configure the location of the Image service API: .. path /etc/nova/nova.conf .. code-block:: ini [glance] # ... api_servers = http://controller:9292 * In the ``[oslo_concurrency]`` section, configure the lock path: .. path /etc/nova/nova.conf .. code-block:: ini [oslo_concurrency] # ... lock_path = /var/lib/nova/tmp .. todo:: https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1506667 * Due to a packaging bug, remove the ``log_dir`` option from the ``[DEFAULT]`` section. * In the ``[placement]`` section, configure the Placement API: .. path /etc/nova/nova.conf .. code-block:: ini [placement] # ... region_name = RegionOne project_domain_name = Default project_name = service auth_type = password user_domain_name = Default auth_url = http://controller:5000/v3 username = placement password = PLACEMENT_PASS Replace ``PLACEMENT_PASS`` with the password you choose for the ``placement`` user in the Identity service. Comment out any other options in the ``[placement]`` section. Finalize installation --------------------- #. Determine whether your compute node supports hardware acceleration for virtual machines: .. code-block:: console $ egrep -c '(vmx|svm)' /proc/cpuinfo If this command returns a value of ``one or greater``, your compute node supports hardware acceleration which typically requires no additional configuration. If this command returns a value of ``zero``, your compute node does not support hardware acceleration and you must configure ``libvirt`` to use QEMU instead of KVM. * Edit the ``[libvirt]`` section in the ``/etc/nova/nova-compute.conf`` file as follows: .. path /etc/nova/nova-compute.conf .. code-block:: ini [libvirt] # ... virt_type = qemu #. Restart the Compute service: .. code-block:: console # service nova-compute restart .. note:: If the ``nova-compute`` service fails to start, check ``/var/log/nova/nova-compute.log``. The error message ``AMQP server on controller:5672 is unreachable`` likely indicates that the firewall on the controller node is preventing access to port 5672. Configure the firewall to open port 5672 on the controller node and restart ``nova-compute`` service on the compute node. Add the compute node to the cell database ----------------------------------------- .. important:: Run the following commands on the **controller** node. #. Source the admin credentials to enable admin-only CLI commands, then confirm there are compute hosts in the database: .. code-block:: console $ . admin-openrc $ openstack compute service list --service nova-compute +----+-------+--------------+------+-------+---------+----------------------------+ | ID | Host | Binary | Zone | State | Status | Updated At | +----+-------+--------------+------+-------+---------+----------------------------+ | 1 | node1 | nova-compute | nova | up | enabled | 2017-04-14T15:30:44.000000 | +----+-------+--------------+------+-------+---------+----------------------------+ #. Discover compute hosts: .. code-block:: console # su -s /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova Found 2 cell mappings. Skipping cell0 since it does not contain hosts. Getting compute nodes from cell 'cell1': ad5a5985-a719-4567-98d8-8d148aaae4bc Found 1 computes in cell: ad5a5985-a719-4567-98d8-8d148aaae4bc Checking host mapping for compute host 'compute': fe58ddc1-1d65-4f87-9456-bc040dc106b3 Creating host mapping for compute host 'compute': fe58ddc1-1d65-4f87-9456-bc040dc106b3 .. note:: When you add new compute nodes, you must run ``nova-manage cell_v2 discover_hosts`` on the controller node to register those new compute nodes. Alternatively, you can set an appropriate interval in ``/etc/nova/nova.conf``: .. code-block:: ini [scheduler] discover_hosts_in_cells_interval = 300