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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 DEBIAN
kumoctl
KUMOCTL(1) General Commands Manual KUMOCTL(1) NAME
kumoctl - show kumofs status SYNOPSIS
kumoctl address[:port=19750] command [options] DESCRIPTION
Show status of kumo-manager and send control commands to kumo-manager. COMMANDS
status show status of the cluster attach attach all new servers and start replace attach-noreplace attach all new servers detach detach all fault servers and start replace detach-noreplace detach all fault servers replace start replace without attach/detach full-replace start full-replace (repair consistency) backup [suffix=20090304] create backup with specified suffix enable-auto-replace enable auto replace disable-auto-replace disable auto replace STATUS
hash space timestamp The time that the list of attached kumo-servers is updated. It is updated when new kumo-server is added or existing kumo-server is down. attached node The list of attached kumo-servers. (active) is normal node and (fault) is fault node or recoverd but not re-attached node. not attached node The list of recognized but not-attached nodes. AUTO REPLACING
By default, you have to attach new kumo-servers manually using kumoctl command. If the auto replacing is enabled, new kumo-servers are attached automatically. This is experimental feature. EXAMPLE
$ kumoctl mgr1 status $ kumoctl mgr1 attach SEE ALSO
kumo-manager(1). kumoctl July 2009 KUMOCTL(1)