Ceph Pacific : Add or Remove OSDs2023/06/19 |
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This is how to add or remove OSDs 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 to OSDs on Admin Node. For Block device on new [node04] Node, use [/dev/sdb] on this example. |
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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"
# transfer required files root@node01:~# scp /etc/ceph/ceph.conf node04:/etc/ceph/ceph.conf root@node01:~# scp /etc/ceph/ceph.client.admin.keyring node04:/etc/ceph root@node01:~# scp /var/lib/ceph/bootstrap-osd/ceph.keyring node04:/var/lib/ceph/bootstrap-osd
# configure OSD root@node01:~# ssh node04 \ "chown ceph:ceph /etc/ceph/ceph.* /var/lib/ceph/bootstrap-osd/*; \ parted --script /dev/sdb 'mklabel gpt'; \ parted --script /dev/sdb "mkpart primary 0% 100%"; \ ceph-volume lvm create --data /dev/sdb1" Running command: /usr/bin/ceph-authtool --gen-print-key Running command: /usr/bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring -i - osd new 80de1be1-a7bd-456a-bd31-9e3c6d561659 Running command: vgcreate --force --yes ceph-d8acd8eb-5414-4fb3-b462-e8ac22dd7c63 /dev/sdb1 stdout: Physical volume "/dev/sdb1" successfully created. stdout: Volume group "ceph-d8acd8eb-5414-4fb3-b462-e8ac22dd7c63" successfully created Running command: lvcreate --yes -l 40959 -n osd-block-80de1be1-a7bd-456a-bd31-9e3c6d561659 ceph-d8acd8eb-5414-4fb3-b462-e8ac22dd7c63 stdout: Logical volume "osd-block-80de1be1-a7bd-456a-bd31-9e3c6d561659" created. ..... ..... stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-3-80de1be1-a7bd-456a-bd31-9e3c6d561659.service → /lib/systemd/system/ceph-volume@.service. Running command: /usr/bin/systemctl enable --runtime ceph-osd@3 stderr: Created symlink /run/systemd/system/ceph-osd.target.wants/ceph-osd@3.service → /lib/systemd/system/ceph-osd@.service. Running command: /usr/bin/systemctl start ceph-osd@3 --> ceph-volume lvm activate successful for osd ID: 3 --> ceph-volume lvm create successful for: /dev/sdb1 # after few minutes, it's OK if HEALTH_OK root@node01:~# ceph -s cluster: id: f6eabaad-6442-481b-bfb1-0bb79de773e3 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 5m) mgr: node01(active, since 16s) mds: 1/1 daemons up osd: 4 osds: 4 up (since 4m), 4 in (since 11m) rgw: 1 daemon active (1 hosts, 1 zones) data: volumes: 1/1 healthy pools: 8 pools, 225 pgs objects: 247 objects, 14 KiB usage: 67 MiB used, 640 GiB / 640 GiB avail pgs: 225 active+clean |
| [2] | To remove an OSD Node 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: 1 daemons, quorum node01 (age 5m)
mgr: node01(active, since 16s)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 4m), 4 in (since 11m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 225 pgs
objects: 247 objects, 14 KiB
usage: 67 MiB used, 640 GiB / 640 GiB avail
pgs: 225 active+clean
root@node01:~# ceph osd tree ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF -1 0.62476 root default -3 0.15619 host node01 0 hdd 0.15619 osd.0 up 1.00000 1.00000 -5 0.15619 host node02 1 hdd 0.15619 osd.1 up 1.00000 1.00000 -7 0.15619 host node03 2 hdd 0.15619 osd.2 up 1.00000 1.00000 -9 0.15619 host node04 3 hdd 0.15619 osd.3 up 1.00000 1.00000 # specify OSD ID of a node you'd like to remove root@node01:~# ceph osd out 3 marked out osd.3. # live watch cluster status # after running [ceph osd out ***], rebalancing is executed automatically # to quit live watch, push [Ctrl + c] root@node01:~# ceph -w
cluster:
id: f6eabaad-6442-481b-bfb1-0bb79de773e3
health: HEALTH_WARN
Degraded data redundancy: 127/741 objects degraded (17.139%), 26 pgs degraded
services:
mon: 1 daemons, quorum node01 (age 6m)
mgr: node01(active, since 89s)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 5m), 3 in (since 16s); 2 remapped pgs
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 225 pgs
objects: 247 objects, 14 KiB
usage: 58 MiB used, 480 GiB / 480 GiB avail
pgs: 127/741 objects degraded (17.139%)
2/741 objects misplaced (0.270%)
194 active+clean
24 active+recovery_wait+degraded
4 active+recovery_wait
2 active+recovery_wait+undersized+degraded+remapped
1 active+recovering
io:
recovery: 119 B/s, 0 keys/s, 5 objects/s
progress:
2023-06-19T00:39:12.810651-0500 mon.node01 [WRN] Health check update: Degraded data redundancy: 61/741 objects degraded (8.232%), 14 pgs degraded (PG_DEGRADED)
.....
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# after status turns to [HEALTH_OK], disable OSD service on the target node root@node01:~# ssh node04 "systemctl disable --now ceph-osd@3.service" # remove the node to specify target OSD ID root@node01:~# ceph osd purge 3 --yes-i-really-mean-it purged osd.3 ceph -s
cluster:
id: f6eabaad-6442-481b-bfb1-0bb79de773e3
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 61s)
mgr: node01(active, since 33s)
mds: 1/1 daemons up
osd: 3 osds: 3 up (since 24s), 3 in (since 5m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 225 pgs
objects: 247 objects, 15 KiB
usage: 67 MiB used, 480 GiB / 480 GiB avail
pgs: 225 active+clean
io:
client: 3.9 KiB/s rd, 716 B/s wr, 3 op/s rd, 0 op/s wr
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