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# How to set up cluster groups

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 `incus cluster group create` command. For example:

    incus cluster group create gpu

To assign a cluster member to one or more groups, use the `incus 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:

    incus cluster group assign server1 gpu

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

    incus cluster group assign server1 default,gpu

To add a cluster member to a specific group without removing it from other groups, use the `incus cluster group add` command.

For example, to add `server1` to the `gpu` group and also keep it in the `default` group, use the following command:

    incus cluster group add server1 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:

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