Ceph Reef : Add or Remove OSDs2023/08/21 |
|
This is how to add or remove OSDs 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 OSD on Admin Node. For Block device on new [node04] Node, use [/dev/sdb] on this example. |
|
# transfer public key [root@node01 ~]# ssh-copy-id node04 # if Firewalld is running, allow service [root@node01 ~]# ssh node04 "firewall-cmd --add-service=ceph; firewall-cmd --runtime-to-permanent" # install required packages [root@node01 ~]# ssh node04 "dnf -y install centos-release-ceph-reef epel-release; dnf -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 854bf810-16f3-4d21-9369-4074f3e450f7 Running command: vgcreate --force --yes ceph-ef7cc8c5-43af-4cef-80b7-e4bfa8e43902 /dev/vdb1 stdout: Physical volume "/dev/vdb1" successfully created. stdout: Volume group "ceph-ef7cc8c5-43af-4cef-80b7-e4bfa8e43902" successfully created Running command: lvcreate --yes -l 40959 -n osd-block-854bf810-16f3-4d21-9369-4074f3e450f7 ceph-ef7cc8c5-43af-4cef-80b7-e4bfa8e43902 stdout: Logical volume "osd-block-854bf810-16f3-4d21-9369-4074f3e450f7" created. ..... ..... Running command: /usr/bin/systemctl enable --runtime ceph-osd@3 stderr: Created symlink /run/systemd/system/ceph-osd.target.wants/ceph-osd@3.service → /usr/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/vdb1 [root@node01 ~]# ceph -s cluster: id: f2e52449-e87b-4786-981e-1f1f58186a7c health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 91m) mgr: node01(active, since 28m) mds: 1/1 daemons up osd: 4 osds: 4 up (since 69s), 4 in (since 79s) rgw: 1 daemon active (1 hosts, 1 zones) data: volumes: 1/1 healthy pools: 8 pools, 225 pgs objects: 220 objects, 459 KiB usage: 259 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. |
|
[root@node01 ~]# ceph -s
cluster:
id: f2e52449-e87b-4786-981e-1f1f58186a7c
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 91m)
mgr: node01(active, since 28m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 69s), 4 in (since 79s)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 225 pgs
objects: 220 objects, 459 KiB
usage: 259 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: f2e52449-e87b-4786-981e-1f1f58186a7c
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 92m)
mgr: node01(active, since 29m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 2m), 3 in (since 7s)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 225 pgs
objects: 221 objects, 459 KiB
usage: 226 MiB used, 480 GiB / 480 GiB avail
pgs: 225 active+clean
io:
client: 539 B/s rd, 179 B/s wr, 0 op/s rd, 0 op/s wr
recovery: 1.1 KiB/s, 1 keys/s, 39 objects/s
2023-08-21T11:45:25.777580+0900 mon.node01 [INF] Health check cleared: PG_AVAILABILITY (was: Reduced data availability: 20 pgs peering)
2023-08-21T11:45:25.777595+0900 mon.node01 [INF] Health check cleared: PG_DEGRADED (was: Degraded data redundancy: 16/663 objects degraded (2.413%), 16 pgs degraded)
2023-08-21T11:45:25.777599+0900 mon.node01 [INF] Cluster is now healthy
.....
.....
# after status turns to [HEALTH_OK], disable OSD service on the target node [root@node01 ~]# ssh node04 "systemctl disable --now ceph-osd@3.service" Removed /run/systemd/system/ceph-osd.target.wants/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: f2e52449-e87b-4786-981e-1f1f58186a7c
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 94m)
mgr: node01(active, since 31m)
mds: 1/1 daemons up
osd: 3 osds: 3 up (since 8s), 3 in (since 91s)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 225 pgs
objects: 220 objects, 459 KiB
usage: 226 MiB used, 480 GiB / 480 GiB avail
pgs: 225 active+clean
|
| Sponsored Link |