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Chapter 8. Investigating HA Ceph Nodes
When deployed with Ceph storage, Red Hat OpenStack Platform uses ceph-mon as a monitor daemon for the Ceph cluster. The director deploys this daemon on all controller nodes.
To check whether the Ceph Monitoring service is running, use:
sudo service ceph status
$ sudo service ceph status
=== mon.overcloud-controller-0 ===
mon.overcloud-controller-0: running {"version":"0.94.1"}On the controllers, as well as on the Ceph Nodes, you can see how Ceph is configured by viewing the /etc/ceph/ceph.conf file. For example:
Here, all three controller nodes (overcloud-controller-0, -1, and -2) are set to monitor the Ceph cluster (mon_initial_members). The 172.19.0.11/24 network (VLAN 203) is used as the Storage Management Network and provides a communications path between the controller and Ceph Storage Nodes. The three Ceph Storage Nodes are on a separate network. As you can see, the IP addresses for those three nodes are on the Storage Network (VLAN 202) and are defined as 172.18.0.15, 172.18.0.16, and 172.18.0.17.
To check the current status of a Ceph node, log into that node and run the following command:
From the ceph -s output, you can see that the health of the Ceph cluster is OK (HEALTH_OK). There are three Ceph monitor services (running on the three overcloud-controller nodes). Also shown here are the IP addresses and ports each is listening on.
For more information about Red Hat Ceph, see the Red Hat Ceph product page.
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