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

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MONs

Of all the nomenclature and jargon within the Ceph ecosystem, Ceph MONs are perhaps the most misleadingly named. While MONs do monitor cluster status, they are much more as well. They act as arbiters, traffic cops, and physicians for the cluster as a whole. As with OSDs, a Ceph MON is, strictly speaking, a daemon process (ceph-mon) that communicates with peer MONs, OSDs, and users, maintaining and distributing various information vital to cluster operations. In practice, the term is also used to refer to the servers on which these daemons run, that is Monitor nodes, mon nodes, or simply mons.

As with all other Ceph components, MONs need to be distributed, redundant, and highly available while also ensuring strict data consistency at ...

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