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Ceph Cookbook - Second Edition by Karan Singh, Michael Hackett, Vikhyat Umrao

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How to do it…

A Ceph storage cluster requires at least one monitor to run. For high availability, a Ceph storage cluster relies on an odd number of monitors and more than one, for example, 3 or 5, to form a quorum. It uses the Paxos algorithm to maintain quorum majority. You will notice that your Ceph cluster is currently showing HEALTH_WARN; this is because we have not configured any OSDs other than ceph-node1. By default, the data in a Ceph cluster is replicated three times, that too on three different OSDs hosted on three different nodes.

Since we already have one monitor running on ceph-node1, let's create two more monitors for our Ceph cluster and configure OSDs on ceph-node2 and ceph-node3:

  1. Update the Ceph hosts ceph-node2 and ceph-node3 ...

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