Chapter 8. Monitoring a high availability Red Hat Ceph Storage cluster

Procedure

• Log in to a Controller node and check that the Ceph Monitoring service is running:

  $ sudo service ceph status
  === mon.overcloud-controller-0 ===
  mon.overcloud-controller-0: running {"version":"0.94.1"}

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Procedure

• Log in to a Controller nodes or on a Ceph node and open the /etc/ceph/ceph.conf file to view the monitoring configuration parameters:

  [global]
  osd_pool_default_pgp_num = 128
  osd_pool_default_min_size = 1
  auth_service_required = cephx
  mon_initial_members = overcloud-controller-0,overcloud-controller-1,overcloud-controller-2
  fsid = 8c835acc-6838-11e5-bb96-2cc260178a92
  cluster_network = 172.19.0.11/24
  auth_supported = cephx
  auth_cluster_required = cephx
  mon_host = 172.18.0.17,172.18.0.15,172.18.0.16
  auth_client_required = cephx
  osd_pool_default_size = 3
  osd_pool_default_pg_num = 128
  public_network = 172.18.0.17/24

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  This example shows the following information:

  • All three Controller nodes are configured to monitor the Red Hat Ceph Storage cluster with the mon_initial_members parameter.
  • The 172.19.0.11/24 network is configured to provide a communication path between the Controller nodes and the Red Hat Ceph Storage nodes.
  • The Red Hat Ceph Storage nodes are assigned to a separate network from the Controller nodes, and the IP addresses for the monitoring Controller nodes are 172.18.0.15, 172.18.0.16, and 172.18.0.17.

Procedure

• Log in to the Ceph node and run the ceph -s command:

  # ceph -s
      cluster 8c835acc-6838-11e5-bb96-2cc260178a92
       health HEALTH_OK
       monmap e1: 3 mons at {overcloud-controller-0=172.18.0.17:6789/0,overcloud-controller-1=172.18.0.15:6789/0,overcloud-controller-2=172.18.0.16:6789/0}
              election epoch 152, quorum 0,1,2 overcloud-controller-1,overcloud-controller-2,overcloud-controller-0
       osdmap e543: 6 osds: 6 up, 6 in
        pgmap v1736: 256 pgs, 4 pools, 0 bytes data, 0 objects
              267 MB used, 119 GB / 119 GB avail
                   256 active+clean

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  This example output shows that the health parameter value is HEALTH_OK, which indicates that the Ceph node is active and healthy. The output also shows three Ceph monitor services that are running on the three overcloud-controller nodes and the IP addresses and ports of the services.