[ClusterLabs] Resource-agents log is not output to /var/log/pacemaker/pacemaker.log on RHEL8

[Ken Gaillot]

On Wed, 2019-05-29 at 16:53 +0900, 飯田雄介 wrote:
> Hi Ken and Jan,
> 
> Thank you for your comment.
> 
> I understand that solusion is to set PCMK_logfile in the sysconfig
> file.
> 
> As a permanent fix, if you use the default values inside Pacemaker,
> how about setting environment variables using set_daemon_option()
> there?

That would be better. I was just going to change the shipped sysconfig
because it's easy to do immediately, but changing the code would handle
cases where users auto-generate a sysconfig that doesn't include it,
launch pacemaker manually for testing, etc. However that'll have to
wait for the next release.

> For example, as PCMK_logficility does.
> 
https://github.com/ClusterLabs/pacemaker/blob/Pacemaker-2.0.2-rc2/lib/common/logging.c#L806
> 
> BTW, Pacemaker writes to /var/log/pacemaker/pacemaker.log via libqb.
> RA writes to this file with echo redirect.
> If writing occurs at the same time, is there a risk that the file may
> be corrupted or the written log may disappear?
> I have never actually had a problem, but I'm interested in how this
> might happen.
> 
> Regards,
> Yusuke
> 
> 2019年5月28日(火) 23:56 Jan Pokorný <jpokorny at redhat.com>:
> > On 28/05/19 09:29 -0500, Ken Gaillot wrote:
> > > On Mon, 2019-05-27 at 14:12 +0900, 飯田雄介 wrote:
> > >> By the way, when /var/log/pacemaker/pacemaker.log is explicitly
> > set
> > >> in the PCMK_logfile, it is confirmed that the resource-agents
> > log is
> > >> output to the file set in the PCMK_logfile.
> > > 
> > > Interesting ... the resource-agents library must look for
> > PCMK_logfile
> > > as well as HA_logfile. In that case, the easiest solution will be
> > for
> > > us to set PCMK_logfile explicitly in the shipped sysconfig file.
> > I can
> > > squeeze that into the soon-to-be-released 2.0.2 since it's not a
> > code
> > > change.
> > 
> > Solution remains the same, only meant to note that presence of
> > either:
> > 
> >   PCMK_logfile
> >   HA_logfile (likely on the way towards deprecation, preferably
> > avoid)

Yep, which brings up the question of what OCF should do. Currently
neither is part of the standard.

> > in the environment (from respective sysconfig/default/conf.d file
> > for
> > pacemaker) will trigger export of HA_LOGFILE environment variable
> > propagated subsequently towards the agent processes, and everything
> > then works as expected.  IOW. OCF and/or resource-agents are still
> > reasonably decoupled, thankfully.
-- 
Ken Gaillot <kgaillot at redhat.com>