nova/doc/source/install/compute-install-ubuntu.rst

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 example architectures <overview-example-architectures> section. Each additional compute node requires a unique IP address.

Install and configure components

1. Install the packages:

   # 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:

     [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:

     [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:

     [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 example architecture <overview-example-architectures>.

   • In the [DEFAULT] section, enable support for the Networking service:

     [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. See the Networking service install guide__ for more details.

   • In the [vnc] section, enable and configure remote console access:

     [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:

     [glance]
     # ...
     api_servers = http://controller:9292

   • In the [oslo_concurrency] section, configure the lock path:

     [oslo_concurrency]
     # ...
     lock_path = /var/lib/nova/tmp

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:

  [placement]
  # ...
  os_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

1. Determine whether your compute node supports hardware acceleration for virtual machines:

   $ 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:

     [libvirt]
     # ...
     virt_type = qemu

2. Restart the Compute service:

   # 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.

1. Source the admin credentials to enable admin-only CLI commands, then confirm there are compute hosts in the database:

   $ . 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 |
   +----+-------+--------------+------+-------+---------+----------------------------+

2. Discover compute hosts:

   # 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:

   [scheduler]
   discover_hosts_in_cells_interval = 300