Pacemaker : Set Fence Device2023/07/27 |
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. |
[2] | |
[3] | 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 Jul 26 21:03 wwn-0x60014052bd00ea23cc44e5a9a8e749f8 -> ../../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-0x60014052bd00ea23cc44e5a9a8e749f8 meta provides=unfencing
# show config 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-0x60014052bd00ea23cc44e5a9a8e749f8 pcmk_host_list="node01.srv.world node02.srv.world" Meta Attributes: scsi-shooter-meta_attributes provides=unfencing Operations: monitor: scsi-shooter-monitor-interval-60s interval=60s # show status # OK if the status of fence device is [Started] root@node01:~# pcs status Cluster name: ha_cluster Status of pacemakerd: 'Pacemaker is running' (last updated 2023-07-26 21:09:59 -05:00) Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.1.5-a3f44794f94) - partition with quorum * Last updated: Wed Jul 26 21:10:00 2023 * Last change: Wed Jul 26 21:09:37 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 |
[4] | Try to test fencing. |
root@node02:~# pcs status Cluster name: ha_cluster Status of pacemakerd: 'Pacemaker is running' (last updated 2023-07-26 21:10:35 -05:00) Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.1.5-a3f44794f94) - partition with quorum * Last updated: Wed Jul 26 21:10:36 2023 * Last change: Wed Jul 26 21:09:37 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 # fencing root@node02:~# pcs stonith fence node01.srv.world Node: node01.srv.world fenced # target node turns to [OFFLINE] and it will be restarted root@node02:~# pcs status Cluster name: ha_cluster Status of pacemakerd: 'Pacemaker is running' (last updated 2023-07-26 21:11:03 -05:00) Cluster Summary: * Stack: corosync * Current DC: node02.srv.world (version 2.1.5-a3f44794f94) - partition with quorum * Last updated: Wed Jul 26 21:11:03 2023 * Last change: Wed Jul 26 21:09:37 2023 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 # after rebooting, if you manually start the node, do like follows root@node02:~# pcs cluster start node01.srv.world |
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