Ceph Nautilus : OSD を追加/削除する2021/08/26 |
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。
| +--------------------+ | +----------------------+ | [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 | | | | | +-----------------------+ +-----------------------+ +-----------------------+ |
[1] | 例として、管理ノードから [node04] ノードを新たに OSD に追加します。 [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。 |
# 公開鍵転送 root@node01:~# ssh-copy-id node04 # 必要なパッケージをインストール root@node01:~# ssh node04 "apt update; apt -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 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 a8a4862e-ed22-4fff-85d1-937eb56ce510 Running command: /usr/sbin/vgcreate --force --yes ceph-5a2cec6e-f514-4376-9aa6-19c2b8987562 /dev/sdb1 stdout: Physical volume "/dev/sdb1" successfully created. stdout: Volume group "ceph-5a2cec6e-f514-4376-9aa6-19c2b8987562" successfully created Running command: /usr/sbin/lvcreate --yes -l 20479 -n osd-block-a8a4862e-ed22-4fff-85d1-937eb56ce510 ceph-5a2cec6e-f514-4376-9aa6-19c2b8987562 stdout: Logical volume "osd-block-a8a4862e-ed22-4fff-85d1-937eb56ce510" created. Running command: /usr/bin/ceph-authtool --gen-print-key Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-3 --> Executable selinuxenabled not in PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin Running command: /usr/bin/chown -h ceph:ceph /dev/ceph-5a2cec6e-f514-4376-9aa6-19c2b8987562/osd-block-a8a4862e-ed22-4fff-85d1-937eb56ce510 Running command: /usr/bin/chown -R ceph:ceph /dev/dm-2 Running command: /usr/bin/ln -s /dev/ceph-5a2cec6e-f514-4376-9aa6-19c2b8987562/osd-block-a8a4862e-ed22-4fff-85d1-937eb56ce510 /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 Running command: /usr/bin/ceph-authtool /var/lib/ceph/osd/ceph-3/keyring --create-keyring --name osd.3 --add-key AQAG8CZhH3q7MhAAEmrrlkKpZFTaE5AhASHVQA== stdout: creating /var/lib/ceph/osd/ceph-3/keyring added entity osd.3 auth(key=AQAG8CZhH3q7MhAAEmrrlkKpZFTaE5AhASHVQA==) 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 a8a4862e-ed22-4fff-85d1-937eb56ce510 --setuser ceph --setgroup ceph stderr: 2021-08-26 10:36:08.965 7f8599a31c00 -1 bluestore(/var/lib/ceph/osd/ceph-3/) _read_fsid unparsable uuid --> ceph-volume lvm prepare successful for: /dev/sdb1 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-5a2cec6e-f514-4376-9aa6-19c2b8987562/osd-block-a8a4862e-ed22-4fff-85d1-937eb56ce510 --path /var/lib/ceph/osd/ceph-3 --no-mon-config Running command: /usr/bin/ln -snf /dev/ceph-5a2cec6e-f514-4376-9aa6-19c2b8987562/osd-block-a8a4862e-ed22-4fff-85d1-937eb56ce510 /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-a8a4862e-ed22-4fff-85d1-937eb56ce510 stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-3-a8a4862e-ed22-4fff-85d1-937eb56ce510.service → /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 → /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: 92749530-d9af-4226-bfe0-ccc79a689a66 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 2h) mgr: node01(active, since 30m) mds: cephfs:1 {0=node01=up:active} osd: 4 osds: 4 up (since 67s), 4 in (since 67s) rgw: 1 daemon active (www) task status: scrub status: mds.node01: idle data: pools: 8 pools, 248 pgs objects: 237 objects, 6.7 MiB usage: 4.0 GiB used, 316 GiB / 320 GiB avail pgs: 248 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。 |
root@node01:~# ceph -s cluster: id: 92749530-d9af-4226-bfe0-ccc79a689a66 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 2h) mgr: node01(active, since 30m) mds: cephfs:1 {0=node01=up:active} osd: 4 osds: 4 up (since 98s), 4 in (since 98s) rgw: 1 daemon active (www) task status: scrub status: mds.node01: idle data: pools: 8 pools, 248 pgs objects: 237 objects, 6.7 MiB usage: 4.0 GiB used, 316 GiB / 320 GiB avail pgs: 248 active+cleanroot@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 # 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: 92749530-d9af-4226-bfe0-ccc79a689a66 health: HEALTH_WARN Degraded data redundancy: 200/711 objects degraded (28.129%), 56 pgs degraded services: mon: 1 daemons, quorum node01 (age 2h) mgr: node01(active, since 31m) mds: cephfs:1 {0=node01=up:active} osd: 4 osds: 4 up (since 2m), 3 in (since 9s) rgw: 1 daemon active (www) task status: scrub status: mds.node01: idle data: pools: 8 pools, 248 pgs objects: 237 objects, 6.7 MiB usage: 3.0 GiB used, 237 GiB / 240 GiB avail pgs: 200/711 objects degraded (28.129%) 2/711 objects misplaced (0.281%) 184 active+clean 56 active+recovery_wait+degraded 7 active+recovery_wait 1 active+recovering io: recovery: 0 B/s, 1 keys/s, 0 objects/s progress: Rebalancing after osd.3 marked out [===================...........] 2021-08-26 10:38:41.585492 mon.node01 [WRN] Health check failed: Degraded data redundancy: 200/711 objects degraded (28.129%), 56 pgs degraded (PG_DEGRADED) 2021-08-26 10:38:41.585543 mon.node01 [INF] Health check cleared: PG_AVAILABILITY (was: Reduced data availability: 67 pgs inactive, 194 pgs peering) 2021-08-26 10:38:47.451400 mon.node01 [WRN] Health check update: Degraded data redundancy: 175/711 objects degraded (24.613%), 50 pgs degraded (PG_DEGRADED) ..... ..... # 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" # 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: 92749530-d9af-4226-bfe0-ccc79a689a66 health: HEALTH_OK services: mon: 1 daemons, quorum node01 (age 2h) mgr: node01(active, since 33m) mds: cephfs:1 {0=node01=up:active} osd: 3 osds: 3 up (since 13s), 3 in (since 97s) rgw: 1 daemon active (www) task status: scrub status: mds.node01: idle data: pools: 8 pools, 248 pgs objects: 237 objects, 6.7 MiB usage: 3.0 GiB used, 237 GiB / 240 GiB avail pgs: 248 active+clean io: client: 34 KiB/s rd, 19 op/s rd, 0 op/s wr |
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