Ceph Nautilus : Add or Remove Monitor Nodes2021/08/26 |
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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 "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"
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
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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: 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" 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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