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Thoughts on HACMP: Automatic start of cluster services
Post 302837531 by zaxxon on Friday 26th of July 2013 03:51:34 AM
07-26-2013
Thoughts on HACMP: Automatic start of cluster services
Hi all,
I remember way back in some old environment, having the HA cluster services not being started automatically at startup, ie. no entry in /etc/inittab.
I remember reason was (taken a 2 node active/passive cluster), to avoid having a backup node being booted, so that it will not automatically be able to receive RGs from the active node, in case the backup node is being booted due to some error, failure, maintenance etc. and just then a failover from the active node could happen... Maybe data loss could occure, whatever as the node could be in an undefinable state (taking a paranoid view of things).
A boot of a system, that is not being issued by an administrator but by any other reason, needs to be investigated. Before that, I would not consider the node ready to be put back into the cluster. I think it is absolutely reasonable.
Though I often see environments and several good official and good unofficial documentations on the net, that the entry in the /etc/inittab to start hacmp automatically at boot is done automatically (I didn't remember that) and there is no note on precaution to disable it of the reasons described above.
How do you handle this? Do you leave the entry in there or remark it?
What's your reason for the one or other?
Is my approach too paranoid or unrealistic?
Please share your thoughts, thanks
I remember way back in some old environment, having the HA cluster services not being started automatically at startup, ie. no entry in /etc/inittab.
I remember reason was (taken a 2 node active/passive cluster), to avoid having a backup node being booted, so that it will not automatically be able to receive RGs from the active node, in case the backup node is being booted due to some error, failure, maintenance etc. and just then a failover from the active node could happen... Maybe data loss could occure, whatever as the node could be in an undefinable state (taking a paranoid view of things).
A boot of a system, that is not being issued by an administrator but by any other reason, needs to be investigated. Before that, I would not consider the node ready to be put back into the cluster. I think it is absolutely reasonable.
Though I often see environments and several good official and good unofficial documentations on the net, that the entry in the /etc/inittab to start hacmp automatically at boot is done automatically (I didn't remember that) and there is no note on precaution to disable it of the reasons described above.
How do you handle this? Do you leave the entry in there or remark it?
What's your reason for the one or other?
Is my approach too paranoid or unrealistic?
Please share your thoughts, thanks
Last edited by zaxxon; 07-26-2013 at 06:35 AM.. Reason: typo
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LEARN ABOUT CENTOS
crm_node
PACEMAKER(8) System Administration Utilities PACEMAKER(8) NAME
Pacemaker - Part of the Pacemaker cluster resource manager SYNOPSIS
crm_node command [options] DESCRIPTION
crm_node - Tool for displaying low-level node information OPTIONS
-?, --help This text -$, --version Version information -V, --verbose Increase debug output -Q, --quiet Essential output only Stack: -A, --openais Only try connecting to an OpenAIS-based cluster -H, --heartbeat Only try connecting to a Heartbeat-based cluster Commands: -n, --name Display the name used by the cluster for this node -N, --name-for-id=value Display the name used by the cluster for the node with the specified id -e, --epoch Display the epoch during which this node joined the cluster -q, --quorum Display a 1 if our partition has quorum, 0 if not -l, --list Display all known members (past and present) of this cluster (Not available for heartbeat clusters) -p, --partition Display the members of this partition -i, --cluster-id Display this node's cluster id -R, --remove=value (Advanced) Remove the (stopped) node with the specified name from Pacemaker's configuration and caches In the case of Heartbeat, CMAN and Corosync 2.0, requires that the node has already been removed from the underlying cluster Additional Options: -f, --force AUTHOR
Written by Andrew Beekhof REPORTING BUGS
Report bugs to pacemaker@oss.clusterlabs.org Pacemaker 1.1.10-29.el7 June 2014 PACEMAKER(8)