Pacemaker : Set Fence Device2022/03/25 |
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 ~]#
[root@node01 ~]# dnf --enablerepo=highavailability -y install fence-agents-scsi watchdog pcp-zeroconf cp /usr/share/cluster/fence_scsi_check /etc/watchdog.d/ [root@node01 ~]# systemctl enable --now watchdog |
[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 Mar 25 09:12 wwn-0x60014054dab1945c29a455882f8da738 -> ../../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-0x60014054dab1945c29a455882f8da738 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-0x60014054dab1945c29a455882f8da738 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: node01.srv.world (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum * Last updated: Fri Mar 25 09:18:32 2022 * Last change: Fri Mar 25 09:18:11 2022 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: node01.srv.world (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum * Last updated: Fri Mar 25 09:19:38 2022 * Last change: Fri Mar 25 09:18:11 2022 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 # target node turns to [OFFLINE] and it will be restarted # after rebooting, status wull be back to [Online] [root@node02 ~]# pcs status Cluster name: ha_cluster Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum * Last updated: Fri Mar 25 09:20:07 2022 * Last change: Fri Mar 25 09:18:11 2022 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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