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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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Monitors

We discuss Ceph Monitors (also known as MONs or mons) in other chapters in detail, but we'll describe them a bit here as well for context. Ceph MONs maintain and serves a wealth of information about cluster topology and status. In this way they are a clearinghouse of sorts, accepting connections and updates from other Ceph daemons including other MONs, OSDs, and MDS instances.

Ceph MONs operate as a cluster, exploiting the Paxos consensus algorithm to ensure reliable and consistent operation as a quorum. The vital information collected and distributed by MONs includes:

  • The mon map, which includes names, addresses, state, epoch, and so on for all MONs in the cluster. The mon map is vital for quorum maintenance and client connections. ...

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