mogan/doc/source/user/server-groups.rst

Server Groups

It's quite like Nova server groups for VMs, but we are based on affinity_zone which is a special metadata of aggregate. affinity and anti-affinity policies make sure servers are on the same or different affinity zones.

Create a Server Group

#. If you want all servers to run on the same affinity zone, create a group with affinity policy.

For example:

$ openstack baremetalcompute server group create --policy affinity Affi
+------------+--------------------------------------+
| Field      | Value                                |
+------------+--------------------------------------+
| uuid       | 5ffe7cc8-c793-4568-be3f-654bc9231acd |
| name       | Affi                                 |
| user_id    | d4479638a8594d359d7f6115980b08da     |
| project_id | 378d5add81b44d3e9afc5b99c31ad209     |
| members    |                                      |
| policies   | affinity                             |
+------------+--------------------------------------+

#. If you want all servers to run on different affinity zone, create a group with anti-affinity policy.

For example:

$ openstack baremetalcompute server group create --policy anti-affinity Anti
+------------+--------------------------------------+
| Field      | Value                                |
+------------+--------------------------------------+
| uuid       | 719d7cf9-141f-4c73-b5e8-669f6b4d4b89 |
| name       | Anti                                 |
| user_id    | d4479638a8594d359d7f6115980b08da     |
| project_id | 378d5add81b44d3e9afc5b99c31ad209     |
| members    |                                      |
| policies   | anti-affinity                        |
+------------+--------------------------------------+

Add a server to Server Group

You can only add a server to a server group when you create the server. Not afterwards. To add a server to a server group, use the --hint group=$group-uuid parameter on the openstack baremetalcompute server create command.

For example:

$ openstack baremetalcompute server create --image IMAGE --flavor gold \
  --key-name KEY --hint group=GROUP --nic net-id=UUID SERVER