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Chapter 12. Remove a Monitor

When you remove monitors from a cluster, consider that Ceph monitors use PAXOS to establish consensus about the master cluster map. You must have a sufficient number of monitors to establish a quorum for consensus about the cluster map.

12.1. ceph-deploy
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To remove a monitor from your cluster, use the mon destroy command. 

ceph-deploy mon destroy <ceph-node> [<ceph-node>]

For example, to remove Ceph monitors on monitor hosts node5 and node6, you would execute the following: 

ceph-deploy mon destroy node5 node6

Check to see that your monitors have left the quorum. 

ceph quorum_status --format json-pretty
Important

Ensure that you remove any references to this monitor in your Ceph configuration file; then, push a new copy of the Ceph configuration file to your Ceph nodes.

Ideally, you should remove the monitor host from Calamari. Get the cluster ID: 

http://{calamari-fqdn}/api/v2/cluster

Then, remove the monitor host from Calamari. 

http://{calamari-fqdn}/api/v2/server
http://{calamari-fqdn}/api/v2/key/{host-fqdn}

12.2. manual
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This procedure removes a ceph-mon daemon from your cluster. If this procedure results in only two monitor daemons, you may add or remove another monitor until you have a number of ceph-mon daemons that can achieve a quorum.

  1. Stop the monitor. : 

    service ceph -a stop mon.{mon-id}

  2. Remove the monitor from the cluster. : 

    ceph mon remove {mon-id}
  3. Remove the monitor entry from ceph.conf.

12.3. Removing Monitors from an Unhealthy Cluster
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This procedure removes a ceph-mon daemon from an unhealhty cluster—​i.e., a cluster that has placement groups that are persistently not active + clean.

  1. Identify a surviving monitor and log in to that host. : 

    ceph mon dump
ssh {mon-host}

  2. Stop the ceph-mon daemon and extract a copy of the monap file. : 

    service ceph stop mon || stop ceph-mon-all
    ceph-mon -i {mon-id} --extract-monmap {map-path}
# for example,
    ceph-mon -i a --extract-monmap /tmp/monmap

  3. Remove the non-surviving monitors. For example, if you have three monitors, mon.a, mon.b, and mon.c, where only mon.a will survive, follow the example below: 

    monmaptool {map-path} --rm {mon-id}
# for example,
monmaptool /tmp/monmap --rm b
monmaptool /tmp/monmap --rm c

  4. Inject the surviving map with the removed monitors into the surviving monitors. For example, to inject a map into monitor mon.a, follow the example below: 

    ceph-mon -i {mon-id} --inject-monmap {map-path}
# for example,
ceph-mon -i a --inject-monmap /tmp/monmap
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