Component Memberships

Memberships are a read-only resource that is generated automatically by changes to groups and partitions. Each component in /hsm/v2/State/Components is represented. Filter options are available to prune the list, or a specific component name (xname) can be given. All groups and the partition (if any) of each component are listed.

Membership information is only needed for node components. The --type node filter option is used in the commands on this page to retrieve information about node memberships only.

Prerequisites

The commands on this page will not work unless the Cray CLI has been initialized on the node where the commands are being run. For more information, see Configure the Cray CLI.

Retrieve membership data for a component

Any components in /hsm/v2/State/Components can have its group and memberships looked up with its individual component name (xname).

Retrieve membership information for a component.

ncn-mw# cray hsm memberships describe MEMBER_ID --format json

Example output:

{
    "id" : "x2c3s0b0n0",
    "groupLabels" : [
        "grp1",
        "red",
        "my_nodes"
    ],
    "partitionName" : "partition2"
}

List component membership data

By default, the memberships collection contains all components, regardless of if they are in a group. However, a filtered subset is desired more frequently. Querying the memberships collection supports the same query options as /hsm/v2/State/Components.

  • Retrieve all node memberships:

    ncn-mw# cray hsm memberships list --type Node

  • Retrieve only nodes not in a partition:

    ncn-mw# cray hsm memberships list --type Node --partition NULL