How to set up cluster groups

▶ Watch on YouTube

Cluster members can be assigned to Cluster groups. By default, all cluster members belong to the default group.

To create a cluster group, use the lxc cluster group create command. For example:

lxc cluster group create gpu

To assign a cluster member to one or more groups, use the lxc cluster group assign command. This command removes the specified cluster member from all the cluster groups it currently is a member of and then adds it to the specified group or groups.

For example, to assign server1 to only the gpu group, use the following command:

lxc cluster group assign server1 gpu

To assign server1 to the gpu group and also keep it in the default group, use the following command:

lxc cluster group assign server1 default,gpu

Launch an instance on a cluster group member

With cluster groups, you can target an instance to run on one of the members of the cluster group, instead of targeting it to run on a specific member.

Note

scheduler.instance must be set to either all (the default) or group to allow instances to be targeted to a cluster group.

See Automatic placement of instances for more information.

To launch an instance on a member of a cluster group, follow the instructions in Launch an instance on a specific cluster member, but use the group name prefixed with @ for the --target flag. For example:

lxc launch images:ubuntu/22.04 c1 --target=@gpu