Pacemaker

How to Configure Two-node Pacemaker Cluster
In this post, we will configure a simple 2 node cluster with cluster nodes as nodea and nodeb. The cluster name will be geeklab. Fencing for this clu...
Most Common Two-node Pacemaker cluster issues and their workarounds
While two-node clusters may look good on paper, in practice there are a lot of extra failure scenarios that are not present with three or more node cl...
Managing Resource Startup Order in Pacemaker Cluster (Managing Constraints)
In this post, lets see how resource groups can be used to control resource startup order by configuring an active/passive NFS server resource group. ...
Troubleshooting Pacemaker Cluster Networking
Identifying network issues Faulty, or misconfigured, network connections can wreak havoc on a cluster. The following is a list of possible issues and ...
Troubleshooting Resource Failures in Pacemaker Cluster
Resource failures Resources can fail for multiple reasons. An administrator might have used incorrect settings when defining the resource, a configura...
How to Configure Cluster Logging for Corosync and Pacemaker
Corosync logging When troubleshooting a cluster, one of the most useful resources at a system administrator's disposal is the system log. The corosync...
Managing resources in a pacemaker cluster (stop/start and relocate resource groups in a running cluster)
Managing services The Red Hat High Availability Add-on allows a cluster administrator to control the resources and resource groups running in the clus...
How to Configure Pacemaker Cluster Notifications
Configuring MailTo notifications Most system administrators like to be notified when a resource migrates to a different node since this is typically a...
How to Create and Configure Resource Groups in a Pacemaker Cluster
Configuring resource groups In most cases, having the cluster run individual resources is not an ideal situation. Mounting a file system with web cont...