Comment 7 for bug 1753640

sudo ceph status
  cluster:
    id: 4ce1de56-383e-11e8-aedd-00163e99e06d
    health: HEALTH_WARN
            application not enabled on 2 pool(s)

sudo ceph health detail
HEALTH_WARN application not enabled on 2 pool(s)
POOL_APP_NOT_ENABLED application not enabled on 2 pool(s)
    application not enabled on pool 'default.rgw.control'
    application not enabled on pool '.rgw.root'
    use 'ceph osd pool application enable <pool-name> <app-name>', where <app-name> is 'cephfs', 'rbd', 'rgw', or freeform for custom applications.

ubuntu@juju-be77dc-0-lxd-0:~$ sudo ceph osd pool application enable default.rgw.control rgw
enabled application 'rgw' on pool 'default.rgw.control'
ubuntu@juju-be77dc-0-lxd-0:~$ sudo ceph osd pool application enable .rgw.root rgw
enabled application 'rgw' on pool '.rgw.root'
ubuntu@juju-be77dc-0-lxd-0:~$ sudo ceph health detail
HEALTH_OK