Alert rule: CephHealthWarning

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Overview

The cluster state has been HEALTH_WARN for more than 15 minutes. Please check ceph health detail for more information.

Steps for debugging

Check Ceph cluster status

Check Ceph for detailed information why the cluster is in HEALTH_WARN state

$ ceph_cluster_ns=syn-rook-ceph-cluster
$ kubectl -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph status
  cluster:
    id:     92716509-0f84-4739-8d04-541d2e7c3e66
    health: HEALTH_WARN (1)
            [ ... detailed information ... ] (2)
            [ ... detailed information ... ] (2)
            [ ... detailed information ... ] (2)

[ ... remaining output omitted ... ]

1	General cluster health status
2	One or more lines of information giving details why the cluster state is degraded. Only available if the cluster health isn’t `HEALTH_OK`.

Check Ceph crash logs

$ ceph_cluster_ns=syn-rook-ceph-cluster
$ kubectl -n "${ceph_cluster_ns}" exec -it deploy/rook-ceph-tools -- ceph crash ls (1)
[ ... list of crash logs ... ]
$ kubectl -n "${ceph_cluster_ns}" exec -it deploy/rook-ceph-tools -- \
      ceph crash info <CRASH_ID> (2)
[ ... detailed crash info ... ]

1	List currently not archived crash logs
2	Show detailed information of crash log with id `<CRASH_ID>`

Archive Ceph crash logs

$ ceph_cluster_ns=syn-rook-ceph-cluster
$ kubectl -n "${ceph_cluster_ns}" exec -it deploy/rook-ceph-tools -- \
      ceph crash archive-all (1)
$ kubectl -n "${ceph_cluster_ns}" exec -it deploy/rook-ceph-tools -- \
      ceph crash archive <CRASH_ID> (2)

1	Archive all currently not archived crash logs
2	Archive crash log with id `<CRASH_ID>`