How do I configure fence_brocade in a RHEL Pacemaker cluster?

Environment

• Red Hat Enterprise Linux 6, 7, 8, or 9 (with the High Availability Add-on)
• Pacemaker
• fence_brocade

Issue

• What options do I need to specify to configure a stonith device using the fence_brocade fence agent?

Resolution

Test the ability to query a node's status

The -o status command described below will test the specified fence_brocade options. This will not reboot a node or revoke its access to storage.

# fence_brocade -o status --ip=<FC switch IP> --username=<username> --password=<password> --plug=<port> [--command-prompt=<command_prompt>] [--ssh]

The --plug option specifies the port on the switch for the node whose status is being queried.

The --command-prompt option allows the user to specify a custom command prompt. The agent expects "> " by default.

The --ssh option enables SSH. The agent uses telnet by default.

A full list of options can be obtained by running fence_brocade --help.

Test the ability to revoke a node's access to shared storage

After a successful test with the -o status option, use the -o off and -o on options to test revoking a node's access to shared storage.

# fence_brocade -o off --ip=<FC switch IP> --login=<username> --password=<password> --plug=<port> [--command-prompt=<command_prompt>] [--ssh]
# fence_brocade -o on --ip=<FC switch IP> --login=<username> --password=<password> --plug=<port> [--command-prompt=<command_prompt>] [--ssh]

Create a fence_brocade stonith device

After verifying that the off and on actions work, configure a stonith device so that the cluster can use fence_brocade to fence an unhealthy node.

# pcs stonith create br_fence fence_brocade ip=<FC switch IP> login=<login name> passwd=<password> pcmk_host_map='<node1_name>:<node1_port>;<node2_name>:<node2_port>' [cmd_prompt=<command_prompt>] [secure=1] pcmk_reboot_action=off meta provides unfencing

A full list of options can be obtained by running pcs stonith describe fence_brocade.

The format for pcmk_host_map is explained in the following article:

• What format should I use to specify node mappings to stonith devices in pcmk_host_list and pcmk_host_map in a RHEL 6 or 7 High Availability cluster? Hostname or IP address? FQDN or shortname?

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