Ceph Pacific : Add or Remove Monitors2021/07/08 |
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This is how to add or remove Monitor Daemons from exisiting 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 # if Firewalld is running, allow service [root@node01 ~]# ssh node04 "firewall-cmd --add-service=ceph-mon; firewall-cmd --runtime-to-permanent" # install required packages [root@node01 ~]# ssh node04 "dnf -y install centos-release-ceph-pacific epel-release; dnf -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 946f2552-23a1-4066-82f3-1c57a2dfed92 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. /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: 946f2552-23a1-4066-82f3-1c57a2dfed92
health: HEALTH_OK
services:
mon: 2 daemons, quorum node01,node04 (age 56m)
mgr: node01(active, since 76m)
osd: 4 osds: 4 up (since 65m), 4 in (since 66m)
data:
pools: 1 pools, 1 pgs
objects: 0 objects, 0 B
usage: 22 MiB used, 320 GiB / 320 GiB avail
pgs: 1 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: 946f2552-23a1-4066-82f3-1c57a2dfed92
health: HEALTH_OK
services:
mon: 2 daemons, quorum node01,node04 (age 56m)
mgr: node01(active, since 76m)
osd: 4 osds: 4 up (since 65m), 4 in (since 66m)
data:
pools: 1 pools, 1 pgs
objects: 0 objects, 0 B
usage: 22 MiB used, 320 GiB / 320 GiB avail
pgs: 1 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" ceph -s
cluster:
id: 946f2552-23a1-4066-82f3-1c57a2dfed92
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 22s)
mgr: node01(active, since 86m)
osd: 4 osds: 4 up (since 75m), 4 in (since 76m)
data:
pools: 1 pools, 1 pgs
objects: 0 objects, 0 B
usage: 22 MiB used, 320 GiB / 320 GiB avail
pgs: 1 active+clean
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