Linux - HA Cluster Maintenance
What is a cluster ?
A group or collection of servers that is providing same service/application.
In this blog we will see about setting cluster into maintenance mode and releasing cluster out of maintenance mode.
What is Maintenance mode ?
Maintenance mode is when the server is not available to service the customers and is currently undergoing a maintenance task.
With HA Cluster enabled, If we need to perform some activity on the cluster managed pools/servers, we will need to enable cluster maintenance mode so that you do not see any unexpected behaviors from the system.
To enable cluster Maintenance following command is used.
For SUSE Clusters
crm configure property maintenance-mode=true
For Redhat Cluster
pcs property set maintenance-mode=true
When you have enabled/set the Maintenance mode you can perform start/stop or any config update on the cluster managed resources. During this period cluster will not interfere with these resources.
Once we have completed the required activity to release cluster from maintenance mode following command is used.
For SUSE Clusters
crm configure property maintenance-mode=false
For Redhat Cluster
pcs property set maintenance-mode=false
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