Ceph Nautilus : Add or Remove OSDs2021/03/31 |
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This is how to add or remove OSDs from exisiting Cluster.
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+--------------------+ |
| [dlp.srv.world] |10.0.0.30 |
| Ceph Client +-----------+
| | |
+--------------------+ |
+----------------------------+----------------------------+
| | |
|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 # if Firewalld is running, allow service [root@node01 ~]# ssh node04 "firewall-cmd --add-service=ceph --permanent; firewall-cmd --reload" # install required packages [root@node01 ~]# ssh node04 "dnf -y install centos-release-ceph-nautilus; 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 a3bb6021-ec1c-45f9-967a-1ab5dac07e18 ..... ..... 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: ea021e0d-d3ac-45b0-b4b6-c1174aa3966b health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 3h) mgr: node01(active, since 60m) osd: 4 osds: 4 up (since 4m), 4 in (since 4m) rgw: 1 daemon active (www) task status: data: pools: 1 pools, 32 pgs objects: 4 objects, 1.2 KiB usage: 4.3 GiB used, 316 GiB / 320 GiB avail pgs: 32 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: ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 3h)
mgr: node01(active, since 64m)
osd: 4 osds: 4 up (since 7m), 4 in (since 7m)
rgw: 1 daemon active (www)
task status:
data:
pools: 1 pools, 32 pgs
objects: 4 objects, 1.2 KiB
usage: 4.3 GiB used, 316 GiB / 320 GiB avail
pgs: 32 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: ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
health: HEALTH_WARN
Degraded data redundancy: 1/15 objects degraded (6.667%), 1 pg degraded
services:
mon: 1 daemons, quorum node01 (age 11m)
mgr: node01(active, since 11m)
osd: 4 osds: 4 up (since 118s), 3 in (since 4s)
data:
pools: 1 pools, 128 pgs
objects: 5 objects, 709 B
usage: 4.0 GiB used, 316 GiB / 320 GiB avail
pgs: 1/15 objects degraded (6.667%)
126 active+clean
1 active+recovering
1 active+recovery_wait+degraded
io:
client: 255 B/s rd, 0 op/s rd, 0 op/s wr
recovery: 84 B/s, 0 objects/s
progress:
Rebalancing after osd.3 marked out
[..............................]
# 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: ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 3h)
mgr: node01(active, since 68m)
osd: 3 osds: 3 up (since 44s), 3 in (since 3m)
rgw: 1 daemon active (www)
task status:
data:
pools: 1 pools, 32 pgs
objects: 4 objects, 1.2 KiB
usage: 3.2 GiB used, 237 GiB / 240 GiB avail
pgs: 32 active+clean
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