Ceph Squid : Add or Remove OSDs2024/10/25 |
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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 for OSD 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 # 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-squid 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-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 a6d24d6a-7e12-49b5-b906-ada7258e2f74 Running command: vgcreate --force --yes ceph-81c39506-80a6-434e-8409-6678a4575319 /dev/sdb1 stdout: Physical volume "/dev/sdb1" successfully created. stdout: Volume group "ceph-81c39506-80a6-434e-8409-6678a4575319" successfully created ..... ..... Running command: /usr/bin/systemctl enable ceph-volume@lvm-3-a6d24d6a-7e12-49b5-b906-ada7258e2f74 stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-3-a6d24d6a-7e12-49b5-b906-ada7258e2f74.service → /usr/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 → /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/sdb1 [root@node01 ~]# ceph -s cluster: id: 7cdf3e2c-b05e-4c77-bfec-e4fcc4bd3a84 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 58m) mgr: node01(active, since 25m) mds: 1/1 daemons up osd: 4 osds: 4 up (since 98s), 4 in (since 108s) rgw: 1 daemon active (1 hosts, 1 zones) data: volumes: 1/1 healthy pools: 8 pools, 321 pgs objects: 220 objects, 460 KiB usage: 275 MiB used, 640 GiB / 640 GiB avail pgs: 321 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: 7cdf3e2c-b05e-4c77-bfec-e4fcc4bd3a84
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 58m)
mgr: node01(active, since 25m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 2m), 4 in (since 2m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 321 pgs
objects: 220 objects, 460 KiB
usage: 275 MiB used, 640 GiB / 640 GiB avail
pgs: 321 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: 7cdf3e2c-b05e-4c77-bfec-e4fcc4bd3a84
health: HEALTH_WARN
too many PGs per OSD (321 > max 250)
services:
mon: 1 daemons, quorum node01 (age 63m)
mgr: node01(active, since 30m)
mds: 1/1 daemons up
osd: 3 osds: 3 up (since 35s), 3 in (since 3m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 321 pgs
objects: 220 objects, 460 KiB
usage: 229 MiB used, 480 GiB / 480 GiB avail
pgs: 321 active+clean
.....
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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" 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: 7cdf3e2c-b05e-4c77-bfec-e4fcc4bd3a84
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 64m)
mgr: node01(active, since 31m)
osd: 3 osds: 3 up (since 97s), 3 in (since 4m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
pools: 6 pools, 161 pgs
objects: 198 objects, 454 KiB
usage: 229 MiB used, 480 GiB / 480 GiB avail
pgs: 161 active+clean
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