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Ceph Nautilus : Add or Remove Monitor Nodes
2021/08/26
 
This is how to add or remove Monitor Daemons from exisiting Cluster.
                                         |
        +--------------------+           |           +----------------------+
        |   [dlp.srv.world]  |10.0.0.30  |  10.0.0.31|    [www.srv.world]   |
        |     Ceph Client    +-----------+-----------+        RADOSGW       |
        |                    |           |           |                      |
        +--------------------+           |           +----------------------+
            +----------------------------+----------------------------+
            |                            |                            |
            |10.0.0.51                   |10.0.0.52                   |10.0.0.53 
+-----------+-----------+    +-----------+-----------+    +-----------+-----------+
|   [node01.srv.world]  |    |   [node02.srv.world]  |    |   [node03.srv.world]  |
|     Object Storage    +----+     Object Storage    +----+     Object Storage    |
|     Monitor Daemon    |    |                       |    |                       |
|     Manager Daemon    |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

[1] For example, Add a [node04] node for Monitor Daemon on Admin Node.
# transfer public key

root@node01:~#
ssh-copy-id node04

# if Firewalld is running, allow service

root@node01:~#
ssh node04 "apt update; apt -y install ceph"
# install required packages

root@node01:~#
FSID=$(grep "^fsid" /etc/ceph/ceph.conf | awk {'print $NF'})

root@node01:~#
NODENAME="node04"

root@node01:~#
NODEIP="10.0.0.54"

root@node01:~#
monmaptool --add $NODENAME $NODEIP --fsid $FSID /etc/ceph/monmap

monmaptool: monmap file /etc/ceph/monmap
monmaptool: set fsid to 92749530-d9af-4226-bfe0-ccc79a689a66
monmaptool: writing epoch 0 to /etc/ceph/monmap (2 monitors)

# configure monitor map

root@node01:~#
scp /etc/ceph/ceph.conf node04:/etc/ceph/ceph.conf

root@node01:~#
scp /etc/ceph/ceph.mon.keyring node04:/etc/ceph

root@node01:~#
scp /etc/ceph/monmap node04:/etc/ceph

root@node01:~#
ssh node04 "ceph-mon --cluster ceph --mkfs -i node04 --monmap /etc/ceph/monmap --keyring /etc/ceph/ceph.mon.keyring"

root@node01:~#
ssh node04 "chown -R ceph. /etc/ceph /var/lib/ceph/mon"

root@node01:~#
ssh node04 "ceph auth get mon. -o /etc/ceph/ceph.mon.keyring"

root@node01:~#
ssh node04 "systemctl enable --now ceph-mon@node04"

root@node01:~#
ssh node04 "ceph mon enable-msgr2"
root@node01:~#
ceph -s

  cluster:
    id:     92749530-d9af-4226-bfe0-ccc79a689a66
    health: HEALTH_OK

  services:
    mon: 2 daemons, quorum node01,node04 (age 7s)
    mgr: node01(active, since 42m)
    mds: cephfs:1 {0=node01=up:active}
    osd: 3 osds: 3 up (since 9m), 3 in (since 10m)
    rgw: 1 daemon active (www)

  task status:
    scrub status:
        mds.node01: idle

  data:
    pools:   8 pools, 248 pgs
    objects: 237 objects, 6.7 MiB
    usage:   3.0 GiB used, 237 GiB / 240 GiB avail
    pgs:     248 active+clean
[2] To remove a Monitor Daemon from existing Cluster, run commands like follows.
For example, Remove [node04] node.
root@node01:~#
ceph -s

  cluster:
    id:     92749530-d9af-4226-bfe0-ccc79a689a66
    health: HEALTH_OK

  services:
    mon: 2 daemons, quorum node01,node04 (age 7s)
    mgr: node01(active, since 42m)
    mds: cephfs:1 {0=node01=up:active}
    osd: 3 osds: 3 up (since 9m), 3 in (since 10m)
    rgw: 1 daemon active (www)

  task status:
    scrub status:
        mds.node01: idle

  data:
    pools:   8 pools, 248 pgs
    objects: 237 objects, 6.7 MiB
    usage:   3.0 GiB used, 237 GiB / 240 GiB avail
    pgs:     248 active+clean

# remove Monitor Daemon

root@node01:~#
ceph mon remove node04

removing mon.node04 at [v2:10.0.0.54:3300/0,v1:10.0.0.54:6789/0], there will be 1 monitors
# disable monitor daemon

root@node01:~#
ssh node04 "systemctl disable --now ceph-mon@node04.service"

root@node01:~#
ceph -s

  cluster:
    id:     92749530-d9af-4226-bfe0-ccc79a689a66
    health: HEALTH_OK

  services:
    mon: 1 daemons, quorum node01 (age 25s)
    mgr: node01(active, since 43m)
    mds: cephfs:1 {0=node01=up:active}
    osd: 3 osds: 3 up (since 10m), 3 in (since 11m)
    rgw: 1 daemon active (www)

  task status:
    scrub status:
        mds.node01: idle

  data:
    pools:   8 pools, 248 pgs
    objects: 237 objects, 6.7 MiB
    usage:   3.0 GiB used, 237 GiB / 240 GiB avail
    pgs:     248 active+clean
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