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Move Ceph Monitor before node replacement#

This document describes how to migrate a Ceph Monitor to another node on bare metal-based clusters before node replacement.

Warning

  • Remove the Ceph Monitor role before the machine removal.
  • Make sure that the Ceph cluster always has an odd number of Ceph Monitors.

The procedure of a Ceph Monitor migration assumes that you temporarily move the Ceph Manager/Monitor to another (for example, worker) node. After a node replacement, we recommend migrating the Ceph Manager/Monitor to the new manager node.

To migrate a Ceph Monitor to another machine:

  1. Move the Ceph Manager/Monitor daemon from the affected node to one of the worker machines as described in Move a Ceph Monitor daemon to another node.
  2. Delete the affected node.

  3. Add a new manager node without the Monitor and Manager role.

    Warning

    The addition of a new node with the Monitor and Manager role breaks the odd number quorum of Ceph Monitors.

  4. Move the previously migrated Ceph Manager/Monitor daemon to the new manager node as described in Move a Ceph Monitor daemon to another node.