[ClusterLabs] Possible idea for 2.0.0: renaming the Pacemaker daemons

[Ken Gaillot]

On Thu, 2018-03-29 at 10:35 +0200, Kristoffer Grönlund wrote:
> Ken Gaillot <kgaillot at redhat.com> writes:
> 
> > Hi all,
> > 
> > Andrew Beekhof brought up a potential change to help with reading
> > Pacemaker logs.
> > 
> > Currently, pacemaker daemon names are not intuitive, making it
> > difficult to search the system log or understand what each one
> > does.
> > 
> > The idea is to rename the daemons, with a common prefix, and a name
> > that better reflects the purpose.
> > 
> 
> [...]
> 
> > Here are the current names, with some example replacements:
> > 
> >  pacemakerd: PREFIX-launchd, PREFIX-launcher
> > 
> >  attrd: PREFIX-attrd, PREFIX-attributes
> > 
> >  cib: PREFIX-configd, PREFIX-state
> > 
> >  crmd: PREFIX-controld, PREFIX-clusterd, PREFIX-controller
> > 
> >  lrmd: PREFIX-locald, PREFIX-resourced, PREFIX-runner
> > 
> >  pengine: PREFIX-policyd, PREFIX-scheduler
> > 
> >  stonithd: PREFIX-fenced, PREFIX-stonithd, PREFIX-executioner
> > 
> >  pacemaker_remoted: PREFIX-remoted, PREFIX-remote
> 
> Better to do it now rather than later. I vote in favor of changing
> the
> names. Yes, it'll mess up crmsh, but at least for distributions it's
> just a simple search/replace patch to apply.
> 
> I would also vote in favour of sticking to the 15 character limit,
> and
> to use "pcmk" as the prefix. That leaves 11 characters for the name,
> which should be enough for anyone ;)
> 
> My votes:
> 
> pacemakerd -> pcmk-launchd
> attrd -> pcmk-attrd
> cib -> pcmk-stated
> crmd -> pcmk-controld
> lrmd -> pcmk-resourced
> pengine -> pcmk-schedulerd
> stonithd -> pcmk-fenced
> pacemaker_remoted -> pcmk-remoted

Those are all acceptable to me. I'd also be fine with pcmk-execd for
lrmd, as suggested elsewhere.

> 
> The one I'm the most divided about is cib. pcmk-cibd would also work.

That is the most difficult one, isn't it? :-)

Looking at it from another direction, maybe pcmk-iod, since it
abstracts disk I/O for the other daemons? It doesn't encompass its
entire purpose, but it points in the right direction.

> I
> would vote against PREFIX-configd as compared to other cluster
> software,
> I would expect that daemon name to refer to a more generic cluster
> configuration key/value store, and that is something that I have some
> hope of adding in the future ;) So I'd like to keep "config" or
> "database" for such a possible future component...

What's the benefit of another layer over the CIB?

> 
> Cheers,
> Kristoffer
> 
-- 
Ken Gaillot <kgaillot at redhat.com>