Pacemaker : Set Fence Device2021/06/11 |
Set Fence Device on Cluster. (see about Fencing on the site below)
https://access.redhat.com/documentation/ja-jp/red_hat_enterprise_linux/8/html/configuring_and_managing_high_availability_clusters/s1-fencing-haao
It's possible to use many kinds of devices for fencing, APC or IPMI and so on.
Configure basic Cluster settings first, refer to here.On this example, Configure storage based fencing by using SCSI storage like follows. +--------------------+ | [ 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 | | | | | +----------------------+ +----------------------+ |
[1] |
Configure ISCSI Target and Create a storage for fence device, refer to here.
On this example, it created ISCSI storage as IQN [iqn.2021-06.world.srv:dlp.target01] with [1M] size. |
[2] | |
[3] | On all Cluster Nodes, Install SCSI Fence Agent. |
[root@node01 ~]# dnf --enablerepo=ha -y install fence-agents-scsi
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[4] | Configure Fencing on a Node. [sda] of the example below is the storage from ISCSI target. |
# confirm disk ID [root@node01 ~]# ll /dev/disk/by-id | grep sda | grep wwn lrwxrwxrwx. 1 root root 9 Jun 11 00:59 wwn-0x600140572e193354335412a8fe77a0b9 -> ../../sda # set fencing # [scsi-shooter] ⇒ any name # [pcmk_host_list=***] ⇒ specify cluster nodes # [devices=***] ⇒ disk ID [root@node01 ~]# pcs stonith create scsi-shooter fence_scsi pcmk_host_list="node01.srv.world node02.srv.world" devices=/dev/disk/by-id/wwn-0x600140572e193354335412a8fe77a0b9 meta provides=unfencing
# show config [root@node01 ~]# pcs stonith config scsi-shooter Resource: scsi-shooter (class=stonith type=fence_scsi) Attributes: devices=/dev/disk/by-id/wwn-0x600140572e193354335412a8fe77a0b9 pcmk_host_list="node01.srv.world node02.srv.world" Meta Attrs: provides=unfencing Operations: monitor interval=60s (scsi-shooter-monitor-interval-60s) # show status # OK if the status of fence device is [Started] [root@node01 ~]# pcs status Cluster name: ha_cluster Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.0.5-9.el8_4.1-ba59be7122) - partition with quorum * Last updated: Fri Jun 11 01:04:01 2021 * Last change: Fri Jun 11 01:03:23 2021 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 |
[5] | Try to test fencing. |
[root@node02 ~]# pcs status Cluster name: ha_cluster Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.0.5-9.el8_4.1-ba59be7122) - partition with quorum * Last updated: Fri Jun 11 01:04:40 2021 * Last change: Fri Jun 11 01:03:23 2021 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 # fencing [root@node02 ~]# pcs stonith fence node01.srv.world Node: node01.srv.world fenced # status of fenced node turns to [OFFLINE] and the node will be restarted [root@node02 ~]# pcs status Cluster name: ha_cluster Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.0.5-9.el8_4.1-ba59be7122) - partition with quorum * Last updated: Fri Jun 11 01:05:08 2021 * Last change: Fri Jun 11 01:03:23 2021 by root via cibadmin on node01.srv.world * 2 nodes configured * 1 resource instance configured Node List: * Online: [ node02.srv.world ] * OFFLINE: [ node01.srv.world ] Full List of Resources: * scsi-shooter (stonith:fence_scsi): Started node02.srv.world Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled |
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