Ceph Pacific : Add or Remove OSDs2021/07/08 |
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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 | 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 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. /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 a6ea2e88-1bbf-4952-977e-2bcb3868c5cb Running command: /usr/sbin/vgcreate --force --yes ceph-850a98ee-de0c-4b06-b6ae-67d0ec3ac255 /dev/sdb1 ..... ..... stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-3-a6ea2e88-1bbf-4952-977e-2bcb3868c5cb.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: 946f2552-23a1-4066-82f3-1c57a2dfed92 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 92m) mgr: node01(active, since 35m) mds: 1/1 daemons up osd: 4 osds: 4 up (since 101s), 4 in (since 119s) rgw: 1 daemon active (1 hosts, 1 zones) data: volumes: 1/1 healthy pools: 8 pools, 193 pgs objects: 217 objects, 44 KiB usage: 216 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: 946f2552-23a1-4066-82f3-1c57a2dfed92
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 92m)
mgr: node01(active, since 35m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 101s), 4 in (since 119s)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 193 pgs
objects: 217 objects, 44 KiB
usage: 216 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: 946f2552-23a1-4066-82f3-1c57a2dfed92
health: HEALTH_WARN
Reduced data availability: 8 pgs inactive, 6 pgs peering
services:
mon: 1 daemons, quorum node01 (age 12m)
mgr: node01(active, since 11m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 100s), 3 in (since 5s); 7 remapped pgs
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 3 pools, 81 pgs
objects: 22 objects, 2.3 KiB
usage: 53 MiB used, 240 GiB / 240 GiB avail
pgs: 45.679% pgs not active
44 active+clean
31 activating
6 remapped+peering
progress:
Global Recovery Event (0s)
[............................]
# 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: 946f2552-23a1-4066-82f3-1c57a2dfed92
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 13m)
mgr: node01(active, since 13m)
mds: 1/1 daemons up
osd: 3 osds: 3 up (since 12s), 3 in (since 79s)
rgw: 1 daemon active (www)
data:
volumes: 1/1 healthy
pools: 3 pools, 81 pgs
objects: 22 objects, 2.3 KiB
usage: 55 MiB used, 240 GiB / 240 GiB avail
pgs: 81 active+clean
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