slackbuilds/system/fence-agents

fence-agents (Cluster Fence Agents)

Fence agents were developed as device "drivers" which are able to prevent
computers from destroying data on shared storage. Their aim is to isolate
a corrupted computer, using one of three methods: Power / Network /
Configuration.

You might also want to install corosync, pacemaker, resource-agents, crmsh,
fence-agents and eventually cluster-glue.