This post provides an introduction to creating a Pacemaker cluster running a service that will fail over from one node to another when the node on which the service is running becomes unavailable. By working through this procedure, you can learn how to create a service in a two-node cluster and you can then observe what happens to that service when it fails on the node on which it running. This example procedure configures a two node Pacemaker cluster running an Apache HTTP server. You can … [Read more...] about Understanding Failover in a Pacemaker Cluster
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Understanding Pacemaker Cluster Tools and Processes
This post provides an introduction to the tools and processes you use to create a Pacemaker cluster. It is intended for users who are interested in seeing what the cluster software looks like and how it is administered, without needing to configure a working cluster. This example requires a single node running CentOS/RHEL 7 and it requires a floating IP address that resides on the same network as the statically assigned IP address for that node. Note: Ensure that the name of the node on which … [Read more...] about Understanding Pacemaker Cluster Tools and Processes
How to create a new lv using an existing volume group that is managed by pacemaker cluster (CentOS/RHEL 7)
1. In order to create a new lv in an existing vg, execute the lvcreate command on the node which has lvm resource running. [root@node2 ~]# pcs status Cluster name: nakul Last updated: Tue Oct 4 01:20:49 2016 Last change: Tue Oct 4 01:20:45 2016 Stack: corosync Current DC: node1.example.com (1) - partition with quorum Version: 1.1.12-a14efad 2 Nodes configured 3 Resources configured Online: [ node1.example.com node2.example.com ] Full list of resources: fence … [Read more...] about How to create a new lv using an existing volume group that is managed by pacemaker cluster (CentOS/RHEL 7)