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Ceph Quincy : Monitor ノードを追加/削除する2022/06/14

 
既存の Ceph クラスターに Monitor ノードを追加/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] ノードに、新たに Monitor Daemin を追加します。
# 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-mon; 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-quincy epel-release; dnf -y install ceph"
# モニターマップ設定

[root@node01 ~]#
FSID=$(grep "^fsid" /etc/ceph/ceph.conf | awk {'print $NF'})

[root@node01 ~]#
NODENAME="node04"

[root@node01 ~]#
NODEIP="10.0.0.54"

[root@node01 ~]#
monmaptool --add $NODENAME $NODEIP --fsid $FSID /etc/ceph/monmap

monmaptool: monmap file /etc/ceph/monmap
monmaptool: set fsid to 8df33401-6131-4c08-9ceb-3894ab029257
monmaptool: writing epoch 0 to /etc/ceph/monmap (2 monitors)

# Monitor Daemin 設定

[root@node01 ~]#
scp /etc/ceph/ceph.conf node04:/etc/ceph/ceph.conf

[root@node01 ~]#
scp /etc/ceph/ceph.mon.keyring node04:/etc/ceph

[root@node01 ~]#
scp /etc/ceph/monmap node04:/etc/ceph

[root@node01 ~]#
ssh node04 "ceph-mon --cluster ceph --mkfs -i node04 --monmap /etc/ceph/monmap --keyring /etc/ceph/ceph.mon.keyring"

[root@node01 ~]#
ssh node04 "chown -R ceph. /etc/ceph /var/lib/ceph/mon"

[root@node01 ~]#
ssh node04 "ceph auth get mon. -o /etc/ceph/ceph.mon.keyring"

[root@node01 ~]#
ssh node04 "systemctl enable --now ceph-mon@node04"

[root@node01 ~]#
ssh node04 "ceph mon enable-msgr2"
[root@node01 ~]#
ceph -s

  cluster:
    id:     8df33401-6131-4c08-9ceb-3894ab029257
    health: HEALTH_OK

  services:
    mon: 2 daemons, quorum node01,node04 (age 30s)
    mgr: node01(active, since 54m)
    mds: 1/1 daemons up
    osd: 3 osds: 3 up (since 6m), 3 in (since 11m)
    rgw: 1 daemon active (1 hosts, 1 zones)

  data:
    volumes: 1/1 healthy
    pools:   7 pools, 209 pgs
    objects: 217 objects, 466 KiB
    usage:   196 MiB used, 480 GiB / 480 GiB avail
    pgs:     209 active+clean
[2] 既存のクラスターから Monitor ノード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:     8df33401-6131-4c08-9ceb-3894ab029257
    health: HEALTH_OK

  services:
    mon: 2 daemons, quorum node01,node04 (age 30s)
    mgr: node01(active, since 54m)
    mds: 1/1 daemons up
    osd: 3 osds: 3 up (since 6m), 3 in (since 11m)
    rgw: 1 daemon active (1 hosts, 1 zones)

  data:
    volumes: 1/1 healthy
    pools:   7 pools, 209 pgs
    objects: 217 objects, 466 KiB
    usage:   196 MiB used, 480 GiB / 480 GiB avail
    pgs:     209 active+clean

# [node04] の Monitor Daemon を分離する

[root@node01 ~]#
ceph mon remove node04

removing mon.node04 at [v2:10.0.0.54:3300/0,v1:10.0.0.54:6789/0], there will be 1 monitors
# 対象ノードの Monitor Daemon を無効化

[root@node01 ~]#
ssh node04 "systemctl disable --now ceph-mon@node04.service"

[root@node01 ~]#
ceph -s

  cluster:
    id:     8df33401-6131-4c08-9ceb-3894ab029257
    health: HEALTH_OK

  services:
    mon: 1 daemons, quorum node01 (age 10s)
    mgr: node01(active, since 55m)
    mds: 1/1 daemons up
    osd: 3 osds: 3 up (since 8m), 3 in (since 12m)
    rgw: 1 daemon active (1 hosts, 1 zones)

  data:
    volumes: 1/1 healthy
    pools:   7 pools, 209 pgs
    objects: 217 objects, 466 KiB
    usage:   196 MiB used, 480 GiB / 480 GiB avail
    pgs:     209 active+clean
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