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Add a compute host

Use the following procedure to add a compute host to an operational cluster.

1. Configure the host as a target host. See the target hosts configuration section of the deploy guide for more information.

2. Edit the /etc/openstack_deploy/openstack_user_config.yml file and add the host to the compute_hosts stanza.

   If necessary, also modify the used_ips stanza.

3. If the cluster is utilizing Telemetry/Metering (ceilometer), edit the /etc/openstack_deploy/conf.d/ceilometer.yml file and add the host to the metering-compute_hosts stanza.

4. Run the following commands to add the host. Replace NEW_HOST_NAME with the name of the new host.

   # cd /opt/openstack-ansible/playbooks
   # openstack-ansible openstack.osa.setup_hosts --limit localhost,NEW_HOST_NAME
   # openstack-ansible openstack.osa.openstack_hosts_setup -e openstack_hosts_group=nova_compute --tags openstack_hosts-file
   # openstack-ansible openstack.osa.setup_openstack --limit localhost,NEW_HOST_NAME
   

   Alternatively you can try using new compute nodes deployment script /opt/openstack-ansible/scripts/add-compute.sh.

   You can provide this script with extra tasks that will be executed before or right after OpenStack-Ansible roles. To do so you should set environment variables PRE_OSA_TASKS or POST_OSA_TASKS with plays to run devided with semicolon:

   # export POST_OSA_TASKS="/opt/custom/setup.yml --limit HOST_NAME;/opt/custom/tasks.yml --tags deploy"
   # /opt/openstack-ansible/scripts/add-compute.sh HOST_NAME,HOST_NAME_2
   

Test new compute nodes

After creating a new node, test that the node runs correctly by launching an instance on the new node:

$ openstack server create --image IMAGE --flavor m1.tiny \
--key-name KEY --availability-zone ZONE:HOST:NODE \
--nic net-id=UUID SERVER

Ensure that the new instance can respond to a networking connection test through the ping command. Log in to your monitoring system, and verify that the monitors return a green signal for the new node.