[ClusterLabs] Default Behavior

[Digimer]

On 28/06/16 11:53 AM, Pavlov, Vladimir wrote:
> Hello!
> 
> We have Pacemaker cluster of two node Active/Backup (OS Centos 6.7),
> with resources IPaddr2 and ldirectord.
> 
> Cluster Properties:
> 
> cluster-infrastructure: cman
> 
> dc-version: 1.1.11-97629de
> 
> no-quorum-policy: ignore
> 
> stonith-enabled: false

You need fencing to be enabled and configured. This is always true, but
particularly so on RHEL 6 because it uses the cman plugin. Please
configure and test stonith, and then repeat your tests to see if the
behavior is more predictable.

> The cluster has been configured for this documentation:
> http://clusterlabs.org/quickstart-redhat-6.html
> 
> Recently, there was a communication failure between cluster nodes and
> the behavior was like this:
> 
> -        During a network failure, each server has become the Master.
> 
> -        After the restoration of the network, one node killing services
> of Pacemaker on the second node.
> 
> -        The second node was not available for the cluster, but all
> resources remain active (Ldirectord,ipvs,ip address). That is, both
> nodes continue to be active.
> 
> We decided to create a test stand and play the situation, but with
> current version of Pacemaker in CentOS repos, сluster behaves differently:
> 
> -        During a network failure, each server has become the Master.
> 
> -        After the restoration of the network, all resources are stopped.
> 
> -        Then the resources are run only on one node. - This behavior
> seems to be more logical.
> 
> Current Cluster Properties on test stand:
> 
> cluster-infrastructure: cman
> 
> dc-version: 1.1.14-8.el6-70404b0
> 
> have-watchdog: false
> 
> no-quorum-policy: ignore
> 
> stonith-enabled: false
> 
> Changed the behavior of the cluster in the new version or accident is
> not fully emulated?
> 
> Thank you.
> 
>  
> 
>  
> 
> Kind regards,
> 
>  
> 
> *Vladimir Pavlov*
> 
>  
> 
> 
> 
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Digimer
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