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

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Upgrades

Upgrading an existing, production Ceph cluster can be both straightforward and tricky. It is best to not leapfrog LTS releases when upgrading. For example, if you're still running Firefly, instead of upgrading directly to Luminous you should consider upgrading first to Hammer, then to Jewel, and only then to Luminous. This strategy considers that the constellation of old and new versions is as large as the resources to test all combinations are limited.

Each Ceph release is accompanied by release notes that detail the best process for upgrades. In some cases there are crucial gotchas that must be considered. For example, by default daemons in Jewel and later releases run as the ceph user, instead of root. When upgrading to Jewel ...

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