New answers tagged high-availability
You can configuring Notifications via External-Agent adding external script to process cluster changes. For example configure ClusterMon to execute an external-agent: primitive ClusterMon ocf:pacemaker:ClusterMon \ params user="root" update="30" extra_options="-E /path/to/pcmk_curl_helper.sh" \ op monitor on-fail="restart" interval="10" clone ...
You don't need to (and shouldn't attempt to) install bits and pieces manually, since you installed acemaker and corosync from packages. The fence_cisco_ucs script is already packaged for you in the fence-agents-cisco-ucs package, and that is what Pacemaker is expecting to find. yum install fence-agents-cisco-ucs
Do i have to add any separate iptable rules for different IP's (VIP and Static Public IP)? That depends on how your existing iptables rules look like. If your'e explicitly allowing access to specific IP addresses, then yes, you need to add rules to the VIP. If you just accept connections to the specific port, then no. How to allow (listen) traffic only on ...
To run clustered services, a quorum is needed. Typically in for example a three-node cluster, every member has one vote each: If you pull the plug on one, it will know that it is inquorate as it has less than half of the available votes (the value is actually configurable). A cluster without quorum is not fit to run clustered services on. This principle is ...
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