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Pacemaker : ノードを追加する
2023/12/05 |
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既存のクラスターにノードを追加する場合の設定です。
例として、既存のクラスターに [node03] を新規に追加します。
+--------------------+
| [ ISCSI Target ] |
| dlp.srv.world |
+----------+---------+
10.0.0.30|
|
+----------------------+ | +----------------------+
| [ Cluster Node#1 ] |10.0.0.51 | 10.0.0.52| [ Cluster Node#2 ] |
| node01.srv.world +----------+----------+ node02.srv.world |
+----------------------+ | +----------------------+
|
|10.0.0.53
+-----------------------+
| [ Cluster Node#3 ] |
+ node03.srv.world |
+-----------------------+
|
| [1] | |
| [2] | 既存のクラスターにノードを新規追加します。 |
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[root@node01 ~]# pcs status Cluster name: ha_cluster Cluster Summary: * Stack: corosync (Pacemaker is running) * Current DC: node01.srv.world (version 2.1.6-10.1.el9-6fdc9deea29) - partition with quorum * Last updated: Tue Dec 5 14:37:00 2023 on node01.srv.world * Last change: Tue Dec 5 14:33:19 2023 by root via cibadmin on node01.srv.world * 2 nodes configured * 1 resource instance configured Node List: * Online: [ node01.srv.world node02.srv.world ] Full List of Resources: * scsi-shooter (stonith:fence_scsi): Started node01.srv.world Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled # 新規ノードの認証を確立 [root@node01 ~]# pcs host auth node03.srv.world
Username: hacluster
Password:
node03.srv.world: Authorized
# 新規ノードを追加 [root@node01 ~]# pcs cluster node add node03.srv.world No addresses specified for host 'node03.srv.world', using 'node03.srv.world' Disabling sbd... node03.srv.world: sbd disabled Sending 'corosync authkey', 'pacemaker authkey' to 'node03.srv.world' node03.srv.world: successful distribution of the file 'corosync authkey' node03.srv.world: successful distribution of the file 'pacemaker authkey' Sending updated corosync.conf to nodes... node01.srv.world: Succeeded node02.srv.world: Succeeded node03.srv.world: Succeeded node01.srv.world: Corosync configuration reloaded |
| [3] | フェンスデバイスの設定を更新します。 当例のようにフェンスデバイスに SCSI フェンシングを設定している場合は、新規追加ノードでフェンスデバイス用の共有ストレージにログインして、SCSI フェンスエージェントをインストールしておきます ([2], [3])。 その後、以下のようにフェンスデバイスの設定を更新します。 |
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# フェンスデバイスのリストを更新 [root@node01 ~]# pcs stonith update scsi-shooter pcmk_host_list="node01.srv.world node02.srv.world node03.srv.world" [root@node01 ~]# pcs stonith config scsi-shooter
Resource: scsi-shooter (class=stonith type=fence_scsi)
Attributes: scsi-shooter-instance_attributes
devices=/dev/disk/by-id/wwn-0x6001405f89df433c1ce4390afc6e0bad
pcmk_host_list="node01.srv.world node02.srv.world node03.srv.world"
Meta Attributes: scsi-shooter-meta_attributes provides=unfencing
Operations: monitor: scsi-shooter-monitor-interval-60s interval=60s
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| [4] | 既存のクラスターにすでにリソースを設定している場合は、フェイルオーバーした際に正常に新規追加ノードがアクティブとなれるように、各リソース用の設定が必要です。 例として、こちらのように LVM 共有ストレージを設定している場合は、新規追加ノードで、事前に LVM 共有ストレージを認識させておく必要があります。 |
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[root@node03 ~]#
iscsiadm -m discovery -t sendtargets -p 10.0.0.30 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target02
[root@node03 ~]#
iscsiadm -m node --login --target iqn.2022-01.world.srv:dlp.target02
[root@node03 ~]#
[root@node03 ~]# iscsiadm -m session -o show tcp: [1] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target01 (non-flash) tcp: [2] 10.0.0.30:3260,1 iqn.2022-01.world.srv:dlp.target02 (non-flash) lvmdevices --adddev /dev/sdb1 [root@node03 ~]# lvm pvscan --cache --activate ay pvscan[17327] PV /dev/vda2 online, VG cs is complete. pvscan[17327] PV /dev/sdb1 ignore foreign VG. pvscan[17327] VG cs run autoactivation. 2 logical volume(s) in volume group "cs" now active |
| [5] |
既存のクラスターにすでにリソースを設定している場合は、フェイルオーバーした際に正常に新規追加ノードがアクティブとなれるように、各リソース用の設定が必要です。 |
| [6] | 各リソース用の設定が全て終了したら、新規追加ノードのクラスターサービスを起動します。 |
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# 新規追加ノード起動 [root@node01 ~]# pcs cluster start node03.srv.world node03.srv.world: Starting Cluster... [root@node01 ~]# pcs cluster enable node03.srv.world node03.srv.world: Cluster Enabled pcs status
Cluster name: ha_cluster
Cluster Summary:
* Stack: corosync (Pacemaker is running)
* Current DC: node02.srv.world (version 2.1.6-10.1.el9-6fdc9deea29) - partition with quorum
* Last updated: Tue Dec 5 15:31:11 2023 on node01.srv.world
* Last change: Tue Dec 5 15:30:11 2023 by hacluster via crmd on node02.srv.world
* 3 nodes configured
* 5 resource instances configured
Node List:
* Online: [ node01.srv.world node02.srv.world node03.srv.world ]
Full List of Resources:
* scsi-shooter (stonith:fence_scsi): Started node01.srv.world
* Resource Group: ha_group:
* lvm_ha (ocf:heartbeat:LVM-activate): Started node01.srv.world
* httpd_fs (ocf:heartbeat:Filesystem): Started node01.srv.world
* httpd_vip (ocf:heartbeat:IPaddr2): Started node01.srv.world
* website (ocf:heartbeat:apache): Started node01.srv.world
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
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| [7] | フェンシングを実行して、新規追加ノードに正常にフェイルオーバーするか確認します。 |
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[root@node03 ~]#
[root@node03 ~]# pcs stonith fence node01.srv.world Node: node01.srv.world fenced pcs status
Cluster name: ha_cluster
Cluster Summary:
* Stack: corosync (Pacemaker is running)
* Current DC: node03.srv.world (version 2.1.6-10.1.el9-6fdc9deea29) - partition with quorum
* Last updated: Tue Dec 5 16:18:09 2023 on node01.srv.world
* Last change: Tue Dec 5 16:15:44 2023 by hacluster via crmd on node03.srv.world
* 3 nodes configured
* 5 resource instances configured
Node List:
* Online: [ node01.srv.world node02.srv.world node03.srv.world ]
Full List of Resources:
* scsi-shooter (stonith:fence_scsi): Started node03.srv.world
* Resource Group: ha_group:
* lvm_ha (ocf:heartbeat:LVM-activate): Started node03.srv.world
* httpd_fs (ocf:heartbeat:Filesystem): Started node03.srv.world
* httpd_vip (ocf:heartbeat:IPaddr2): Started node03.srv.world
* website (ocf:heartbeat:apache): Started node03.srv.world
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
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| [8] | ノードを削除する場合は、以下のように実行します。 |
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[root@node01 ~]# pcs status
Cluster name: ha_cluster
Cluster Summary:
* Stack: corosync (Pacemaker is running)
* Current DC: node02.srv.world (version 2.1.6-10.1.el9-6fdc9deea29) - partition with quorum
* Last updated: Tue Dec 5 15:31:11 2023 on node01.srv.world
* Last change: Tue Dec 5 15:30:11 2023 by hacluster via crmd on node02.srv.world
* 3 nodes configured
* 5 resource instances configured
Node List:
* Online: [ node01.srv.world node02.srv.world node03.srv.world ]
Full List of Resources:
* scsi-shooter (stonith:fence_scsi): Started node01.srv.world
* Resource Group: ha_group:
* lvm_ha (ocf:heartbeat:LVM-activate): Started node01.srv.world
* httpd_fs (ocf:heartbeat:Filesystem): Started node01.srv.world
* httpd_vip (ocf:heartbeat:IPaddr2): Started node01.srv.world
* website (ocf:heartbeat:apache): Started node01.srv.world
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
[root@node01 ~]# pcs cluster node remove node03.srv.world Destroying cluster on hosts: 'node03.srv.world'... node03.srv.world: Successfully destroyed cluster Sending updated corosync.conf to nodes... node01.srv.world: Succeeded node02.srv.world: Succeeded node01.srv.world: Corosync configuration reloaded # フェンスデバイスのリストを更新 [root@node01 ~]# pcs stonith update scsi-shooter pcmk_host_list="node01.srv.world node02.srv.world"
pcs status
Cluster name: ha_cluster
Cluster Summary:
* Stack: corosync (Pacemaker is running)
* Current DC: node02.srv.world (version 2.1.6-10.1.el9-6fdc9deea29) - partition with quorum
* Last updated: Tue Dec 5 16:23:21 2023 on node01.srv.world
* Last change: Tue Dec 5 16:22:57 2023 by root via cibadmin on node01.srv.world
* 2 nodes configured
* 5 resource instances configured
Node List:
* Online: [ node01.srv.world node02.srv.world ]
Full List of Resources:
* scsi-shooter (stonith:fence_scsi): Started node01.srv.world
* Resource Group: ha_group:
* lvm_ha (ocf:heartbeat:LVM-activate): Started node01.srv.world
* httpd_fs (ocf:heartbeat:Filesystem): Started node01.srv.world
* httpd_vip (ocf:heartbeat:IPaddr2): Started node01.srv.world
* website (ocf:heartbeat:apache): Started node01.srv.world
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
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