Install and configure a compute node for Red Hat Enterprise Linux and CentOS¶

Install the packages:

# yum install openstack-nova-compute

Edit the /etc/nova/nova.conf file and complete the following actions:

• In the [DEFAULT] section, enable only the compute and metadata APIs:

  [DEFAULT]
  # ...
  enabled_apis = osapi_compute,metadata
  

• 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.

• 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.

• 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
  

• 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.

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.conf file as follows:

  [libvirt]
  # ...
  virt_type = qemu
  

Start the Compute service including its dependencies and configure them to start automatically when the system boots:

# systemctl enable libvirtd.service openstack-nova-compute.service
# systemctl start libvirtd.service openstack-nova-compute.service

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 |
+----+-------+--------------+------+-------+---------+----------------------------+

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

[scheduler]
discover_hosts_in_cells_interval = 300