Install and configure OpenStack compute node for Ubuntu

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This section describes how to install and configure openstack 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.

Install and configure OpenStack Compute components

Install the packages:

# apt install nova-compute

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

  • In the [DEFAULT] section, configure RabbitMQ message queue access:
# ...
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:
# ...
auth_strategy = keystone

# ...
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.

In the [DEFAULT] section, configure the my_ip option:

# ...
  • Replace MANAGEMENT_INTERFACE_IP_ADDRESS with the IP address of the management network interface on your compute node, typically for the first node in the example architecture.
  • In the [DEFAULT] section, enable support for the Networking service:
# ...
use_neutron = True
firewall_driver = nova.virt.firewall.NoopFirewallDriver

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

# ...
enabled = True
server_listen =
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.

in the [glance] section, configure the location of the Image service API:

# ...
api_servers = http://controller:9292

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

# ...
lock_path = /var/lib/nova/tmp


  • Due to a packaging bug, remove the log_dir option from the [DEFAULT] section.
  • In the [placement] section, configure the Placement API:
# ...
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

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:

$ 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:
# ...
virt_type = qemu

Restart the Compute service:

# service nova-compute restart


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

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


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:

discover_hosts_in_cells_interval = 300
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