Ceph Pacific : Add or Remove Monitor Nodes2023/06/19 |
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This is how to add or remove Monitor Daemons from existing Cluster.
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+--------------------+ | +----------------------+
| [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 | | | | |
+-----------------------+ +-----------------------+ +-----------------------+
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| [1] | For example, Add a [node04] node for Monitor Daemon on Admin Node. |
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# 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"
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
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| [2] | To remove a Monitor Daemon from existing Cluster, run commands like follows. For example, Remove [node04] node. |
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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" 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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