cinder

Operations

Auditing orphan attachments

It's possible that over time, there are some volumes that have attachments which are no longer valid. This can happen when a server is being deleted via Nova but the request to delete the volume and the attachment fails. You can get a list of volumes which have attachments that are no longer valid by running the following command:

for volume in $(openstack volume list --all-projects --status in-use -c ID -f value | tac); do
  for server in $(openstack volume show $volume -f json| jq -r '.attachments[0].server_id'); do
    name=$(openstack server show $server -c name -f value 2>&1)

    if [ "$name" = "No server with a name or ID of '$server' exists." ]; then
      echo openstack volume set --detached $volume
      echo openstack volume delete $volume
    else
      echo "Volume $volume is attached to $name"
    fi
  done
done

Note

You can optionally replace --all-projects by --project <project_id> in the openstack volume list command to filter the volumes by project.

Configuring backup storage

Cinder supports a wide variety of storage backends to store volume backups. They can be referenced from the Cinder documentation.

Ceph

It is possible to backup volumes into a Ceph cluster. You are able to store the backups inside the same Ceph cluster that is deployed by Atmosphere or an external cluster that you deploy.

Atmosphere

If you're looking to use the Ceph cluster that is deployed by Atmosphere, you will need to simply set the following inventory variables:

cinder_helm_values:
  conf:
    cinder:
      DEFAULT:
        backup_driver: cinder.backup.drivers.ceph.CephBackupDriver

Warning

It's not recommended to use same backend for volumes and backups. If you are using Atmosphere's Ceph for volumes, you should use a different Ceph cluster for backups.

External

If you want to use an external Ceph cluster, you will need to set the following inventory variables:

cinder_helm_values:
  conf:
    cinder:
      DEFAULT:
        backup_driver: cinder.backup.drivers.ceph.CephBackupDriver
        backup_ceph_user: cinder
        backup_ceph_pool: backups
  backup:
    external_ceph_rbd:
      enabled: true
      admin_keyring: AQCBYNhjMtiXEBAA3weDsYA2zoPqOXTRijQtzg==
      conf:
        global:
          fsid: 795115d3-2b3d-567f-b5f8-72703d896b56
          mon host: 10.96.240.153,10.96.240.126,10.96.240.240

Atmosphere will automatically create a cephx user which matches the provided backup_ceph_user variable. It will also create a pool with the name of the backup_ceph_pool variable.