Ceph Pacific : Add or Remove OSDs2022/03/31 |
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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-pacific; 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. /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 36c64bed-ab6d-44dc-97f6-d08ea4e5bb90 Running command: /usr/sbin/vgcreate --force --yes ceph-90aa1c1d-4ffa-49b3-9b8c-5461b37b4225 /dev/sdb1 ..... ..... Running command: /usr/bin/systemctl enable ceph-volume@lvm-3-36c64bed-ab6d-44dc-97f6-d08ea4e5bb90 stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-3-36c64bed-ab6d-44dc-97f6-d08ea4e5bb90.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: 7912846f-a2bd-407d-8032-0bdb9adf2c50 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 95m) mgr: node01(active, since 93m) mds: 1/1 daemons up osd: 4 osds: 4 up (since 108s), 4 in (since 2m) rgw: 1 daemon active (1 hosts, 1 zones) data: volumes: 1/1 healthy pools: 8 pools, 193 pgs objects: 217 objects, 52 KiB usage: 144 MiB used, 320 GiB / 320 GiB avail pgs: 193 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: 7912846f-a2bd-407d-8032-0bdb9adf2c50
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 95m)
mgr: node01(active, since 93m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 108s), 4 in (since 2m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 193 pgs
objects: 217 objects, 52 KiB
usage: 144 MiB used, 320 GiB / 320 GiB avail
pgs: 193 active+clean
[root@node01 ~]# ceph osd tree ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF -1 0.31238 root default -3 0.07809 host node01 0 hdd 0.07809 osd.0 up 1.00000 1.00000 -5 0.07809 host node02 1 hdd 0.07809 osd.1 up 1.00000 1.00000 -7 0.07809 host node03 2 hdd 0.07809 osd.2 up 1.00000 1.00000 -9 0.07809 host node04 3 hdd 0.07809 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: 7912846f-a2bd-407d-8032-0bdb9adf2c50
health: HEALTH_WARN
Degraded data redundancy: 139/651 objects degraded (21.352%), 29 pgs degraded
services:
mon: 1 daemons, quorum node01 (age 96m)
mgr: node01(active, since 95m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 3m), 3 in (since 16s); 17 remapped pgs
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 193 pgs
objects: 217 objects, 52 KiB
usage: 124 MiB used, 240 GiB / 240 GiB avail
pgs: 139/651 objects degraded (21.352%)
24/651 objects misplaced (3.687%)
144 active+clean
29 active+recovery_wait+degraded
17 active+remapped+backfill_wait
2 active+recovery_wait
1 active+recovering
io:
recovery: 0 B/s, 0 objects/s
progress:
Global Recovery Event (10s)
[====================........] (remaining: 3s)
# 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: 7912846f-a2bd-407d-8032-0bdb9adf2c50
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 98m)
mgr: node01(active, since 96m)
mds: 1/1 daemons up
osd: 3 osds: 3 up (since 10s), 3 in (since 101s)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 193 pgs
objects: 217 objects, 52 KiB
usage: 126 MiB used, 240 GiB / 240 GiB avail
pgs: 193 active+clean
io:
client: 5.0 KiB/s rd, 0 B/s wr, 4 op/s rd, 3 op/s wr
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