Create a Server Group

1 Syntax
2 Example
3 References

Server groups can be used to ensure that instances are either placed on the same hypervisor (affinity) or are placed on different hypervisors (anti-affinity).

There are four policies which can be applied to a server group:

affinity
soft-affinity
anti-affinity
soft-anti-affinity

Server groups can be implemented in a Heat template using the resource OS::Nova::ServerGroup.

Syntax

resource:
  server_group:
    type: OS::Nova:ServerGroup
    properties:
      name: string #Optional, - Server group name. Any updates cause replacement.
      policies: [string, string] #Optional, a list of string policies to apply.

Example

resources:

  affinity_group:
    type: OS::Nova::ServerGroup
    properties:
      name: hosts on same compute nodes
      policies:
        - affinity

  my_instance:
    type: OS::Nova::Server
    properties:
      image: { get_param: image_id }
      flavor: { get_param: flavor_id }
      key_name: {get_param: KeyName }
      networks:
        - network: Internal #define the network to use as internal
      security_groups:
        - { get_param: security_group_id }
      user_data_format: RAW
      name: server_1 #name for instance
        scheduler_hints:
          group: {get_resource: affinity_group}

You can list the server groups which are in your project using the command:

openstack server group list

This should return a table similar to this one:

You can also list the members of the server group using:

For example:

Syntax

Example

References