[Cluster-devel] skipping unused services, cman_tool join -A

[David Teigland <teigland@redhat.com>]

On Wed, Jan 27, 2010 at 01:51:38PM -0700, Steven Dake wrote:
> On Wed, 2010-01-27 at 14:49 -0600, David Teigland wrote:
> > On Fri, Sep 25, 2009 at 02:27:52PM -0500, David Teigland wrote:
> > > To avoid loading+running services that you don't use (e.g. to avoid bugs
> > > crashing the system from a service you're not using)
> > > 
> > > add to cluster.conf
> > > 
> > > <service name="corosync_cman" ver="0"/>
> > > <service name="openais_ckpt" ver="0"/>
> > > 
> > > run cman_tool join -A
> > > 
> > > (or set CMAN_JOIN_OPTS env var)
> > 
> > Currently cman_tool loads the list of services defined by
> > "openaisserviceenablestable", which is clm, evt, ckpt, msg, lck, tmr.
> > 
> > I suggest that by default cman_tool only load the services that we use,
> > namely ckpt (and cman of course).  If someone wants to use another of the
> > services, they can use cluster.conf <service> to load it.
> > 
> > I don't think this suggestion went over very well last time I brought it
> > up, but recently the trend has been shifting toward narrowing our exposure
> > to things we've tested... so I'm tossing it out one more time.

> Unfortunately this is not possible because it would break rolling
> upgrades as I have stated in the past.

cman makes config adjustments upon seeing <cman upgrading="yes"/>, could
it not do that for services?

Dave