Ceph Tentacle : OSD を追加/削除する2025/09/25 |
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既存の Ceph クラスターに OSD を追加/削除するには、以下のように設定します。
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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] | 例として、管理ノードから [node04] ノードに、新たに OSD を追加します。 [node04] ノード上で Ceph 用に設定するブロックデバイスは [/dev/sdb] を使用します。 |
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# 公開鍵転送 [root@node01 ~]# ssh-copy-id node04 # Firewalld 稼働中の場合はサービス許可 [root@node01 ~]# ssh node04 "firewall-cmd --add-service=ceph; firewall-cmd --runtime-to-permanent" # 必要なパッケージをインストール [root@node01 ~]# ssh node04 "dnf -y install centos-release-ceph-tentacle epel-release; dnf --enablerepo=crb -y install ceph"
# 必要なファイルを転送 [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
# OSD の設定 [root@node01 ~]# ssh node04 \ "chown -R ceph:ceph /etc/ceph/ceph.* /var/lib/ceph; \ 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 30c601fb-642f-491d-b4d1-de14b5b69a4c Running command: vgcreate --force --yes ceph-2672e5b1-7951-4b81-8471-66182e74d79e /dev/vdb1 stdout: Physical volume "/dev/vdb1" successfully created. stdout: Volume group "ceph-2672e5b1-7951-4b81-8471-66182e74d79e" successfully created Running command: lvcreate --yes -l 40959 -n osd-block-30c601fb-642f-491d-b4d1-de14b5b69a4c ceph-2672e5b1-7951-4b81-8471-66182e74d79e stdout: Logical volume "osd-block-30c601fb-642f-491d-b4d1-de14b5b69a4c" created. Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-3 Running command: /usr/sbin/restorecon /var/lib/ceph/osd/ceph-3 Running command: /usr/bin/chown -h ceph:ceph /dev/ceph-2672e5b1-7951-4b81-8471-66182e74d79e/osd-block-30c601fb-642f-491d-b4d1-de14b5b69a4c Running command: /usr/bin/chown -R ceph:ceph /dev/dm-2 Running command: /usr/bin/ln -s /dev/ceph-2672e5b1-7951-4b81-8471-66182e74d79e/osd-block-30c601fb-642f-491d-b4d1-de14b5b69a4c /var/lib/ceph/osd/ceph-3/block Running command: /usr/bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring mon getmap -o /var/lib/ceph/osd/ceph-3/activate.monmap stderr: got monmap epoch 2 --> Creating keyring file for osd.3 Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-3/keyring Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-3/ Running command: /usr/bin/ceph-osd --cluster ceph --osd-objectstore bluestore --mkfs -i 3 --monmap /var/lib/ceph/osd/ceph-3/activate.monmap --keyfile - --osd-data /var/lib/ceph/osd/ceph-3/ --osd-uuid 30c601fb-642f-491d-b4d1-de14b5b69a4c --setuser ceph --setgroup ceph stderr: 2025-09-25T11:05:36.100+0900 7f8fef5d4900 -1 bluestore(/var/lib/ceph/osd/ceph-3//block) No valid bdev label found stderr: 2025-09-25T11:05:36.116+0900 7f8fef5d4900 -1 bluestore(/var/lib/ceph/osd/ceph-3/) _read_fsid unparsable uuid --> ceph-volume lvm prepare successful for: /dev/vdb1 Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-3 Running command: /usr/bin/ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/ceph-2672e5b1-7951-4b81-8471-66182e74d79e/osd-block-30c601fb-642f-491d-b4d1-de14b5b69a4c --path /var/lib/ceph/osd/ceph-3 --no-mon-config Running command: /usr/bin/ln -snf /dev/ceph-2672e5b1-7951-4b81-8471-66182e74d79e/osd-block-30c601fb-642f-491d-b4d1-de14b5b69a4c /var/lib/ceph/osd/ceph-3/block Running command: /usr/bin/chown -h ceph:ceph /var/lib/ceph/osd/ceph-3/block Running command: /usr/bin/chown -R ceph:ceph /dev/dm-2 Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-3 Running command: /usr/bin/systemctl enable ceph-volume@lvm-3-30c601fb-642f-491d-b4d1-de14b5b69a4c stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-3-30c601fb-642f-491d-b4d1-de14b5b69a4c.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/vdb1 [root@node01 ~]# ceph -s cluster: id: 4b46d240-7b97-412e-b5b6-8c58e8d25835 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 68m) [leader: node01] mgr: node01(active, since 21m) mds: 1/1 daemons up osd: 4 osds: 4 up (since 78s), 4 in (since 85s) rgw: 1 daemon active (1 hosts, 1 zones) data: volumes: 1/1 healthy pools: 8 pools, 321 pgs objects: 252 objects, 464 KiB usage: 236 MiB used, 640 GiB / 640 GiB avail pgs: 321 active+clean |
| [2] | 既存のクラスターから OSD を削除する場合は以下のように実行します。 例として、管理ノードから [node04] ノードを削除します。 |
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[root@node01 ~]# ceph -s
cluster:
id: 4b46d240-7b97-412e-b5b6-8c58e8d25835
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 68m) [leader: node01]
mgr: node01(active, since 21m)
mds: 1/1 daemons up
osd: 4 osds: 4 up (since 78s), 4 in (since 85s)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
volumes: 1/1 healthy
pools: 8 pools, 321 pgs
objects: 252 objects, 464 KiB
usage: 236 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 # 削除したい OSD の ID を指定してクラスターから分離する [root@node01 ~]# ceph osd out 3 marked out osd.3. # クラスターステータスを リアルタイムウォッチ する # [ceph osd out ***] 実行後、リバランスが実行されデータが再配置される # リアルタイムウォッチを終了する場合は [Ctrl + c] [root@node01 ~]# ceph -w
cluster:
id: 4b46d240-7b97-412e-b5b6-8c58e8d25835
health: HEALTH_WARN
too many PGs per OSD (321 > max 250)
services:
mon: 1 daemons, quorum node01 (age 69m) [leader: node01]
mgr: node01(active, since 23m)
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, 321 pgs
objects: 255 objects, 464 KiB
usage: 191 MiB used, 480 GiB / 480 GiB avail
pgs: 321 active+clean
io:
recovery: 96 KiB/s, 2 keys/s, 44 objects/s
.....
.....
# クラスターステータスが [HEALTH_OK] になったのち、対象ノードの OSD サービスを無効化 [root@node01 ~]# ssh node04 "systemctl disable --now ceph-osd@3.service" Removed /run/systemd/system/ceph-osd.target.wants/ceph-osd@3.service. # 対象ノードの OSD ID を指定してクラスターから削除する [root@node01 ~]# ceph osd purge 3 --yes-i-really-mean-it purged osd.3 ceph -s
cluster:
id: 4b46d240-7b97-412e-b5b6-8c58e8d25835
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 73m) [leader: node01]
mgr: node01(active, since 27m)
osd: 3 osds: 3 up (since 71s), 3 in (since 4m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
pools: 6 pools, 161 pgs
objects: 231 objects, 459 KiB
usage: 191 MiB used, 480 GiB / 480 GiB avail
pgs: 161 active+clean
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