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Ceph Pacific : Add or Remove Monitor Nodes2023/06/19

 
This is how to add or remove Monitor Daemons from existing 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

# install required packages

root@node01:~#
ssh node04 "apt update; apt -y install ceph"
# configure monitor map

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 f6eabaad-6442-481b-bfb1-0bb79de773e3ID /etc/ceph/monmap
monmaptool: writing epoch 0 to /etc/ceph/monmap (2 monitors)

# configure Monitor Daemin

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: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:     f6eabaad-6442-481b-bfb1-0bb79de773e3
    health: HEALTH_OK

  services:
    mon: 2 daemons, quorum node01,node04 (age 7s)
    mgr: node01(active, since 4m)
    mds: 1/1 daemons up
    osd: 3 osds: 3 up (since 4m), 3 in (since 9m)
    rgw: 1 daemon active (1 hosts, 1 zones)

  data:
    volumes: 1/1 healthy
    pools:   8 pools, 225 pgs
    objects: 247 objects, 16 KiB
    usage:   72 MiB used, 480 GiB / 480 GiB avail
    pgs:     225 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:     f6eabaad-6442-481b-bfb1-0bb79de773e3
    health: HEALTH_OK

  services:
    mon: 2 daemons, quorum node01,node04 (age 7s)
    mgr: node01(active, since 4m)
    mds: 1/1 daemons up
    osd: 3 osds: 3 up (since 4m), 3 in (since 9m)
    rgw: 1 daemon active (1 hosts, 1 zones)

  data:
    volumes: 1/1 healthy
    pools:   8 pools, 225 pgs
    objects: 247 objects, 16 KiB
    usage:   72 MiB used, 480 GiB / 480 GiB avail
    pgs:     225 active+clean

# remove Monitor Daemon

root@node01:~#
ceph mon remove node04

# disable monitor daemon

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

root@node01:~#
ceph -s

  cluster:
    id:     f6eabaad-6442-481b-bfb1-0bb79de773e3
    health: HEALTH_OK

  services:
    mon: 1 daemons, quorum node01 (age 20s)
    mgr: node01(active, since 6m)
    mds: 1/1 daemons up
    osd: 3 osds: 3 up (since 5m), 3 in (since 11m)
    rgw: 1 daemon active (1 hosts, 1 zones)

  data:
    volumes: 1/1 healthy
    pools:   8 pools, 225 pgs
    objects: 247 objects, 16 KiB
    usage:   72 MiB used, 480 GiB / 480 GiB avail
    pgs:     225 active+clean
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