[Linux-ha-dev] Several questions about logging

[Michael Kapp]

Alan Robertson wrote:
> Michael Kapp wrote:
>> 1. Logging Format
>> Logging in heartbeat-v2.07
>>
>> All heartbeat components are logging like this:
>>
>> Example:
>> ========
>>
>> cib: [32185]
>>
>> but i think it has to look as the standard format:
>>
>> Example:
>> ========
>>
>> smtpd[10799]:
> 
> I suspect this could be changed.  But, it turns out to be easier to grep
> for messages from particular subsystems if they're in the format we use.

(unwritten) logging standards are not only useful for heartbeat, also
for logfile analyzer tools which are essential in big server environments.

> 
>> ?
>>
>> #=========================================================
>>
>> 2. Why does the default ha_logd.cf file has to be in /etc?
>>
>> The hearbeat logfile says:
>>
>> 2006-11-13 16:37:55 +01:00; node1; local7.info; heartbeat: [18382]:
>> info: logfile and debug file are those specified in logd config file
>> (default /etc/logd.cf)
>>
>> The place of ha_logd.cf should be in /etc/ha.d or /etc/ha.d/conf?
> 
> I don't know who created the conf directory -- but it's not much used.
> 
> With regard to the log file name, logd isn't really specific to
> Linux-HA, and we had some other folks be interested in using it.  So, we
> chose (maybe wrongly) to locate it in /etc directly - in a probably vain
> attempt to encourage reuse.

When ha_logd came with linux-ha, then ha_logd.cf should be in /etc/ha.d,
and it have to be named as ha_logd.cf and not as logd.cf, no?

>>
>> 5. Can someone explain me the functionality of ha_logd in detail please
>> (is it used as "fallback" logger daemon, if yes how etc.)?
> 
> It is a NON-BLOCKING logging daemon.  We've seen syslog get many
> hundreds of messages behind when logging is cranked up.  Heartbeat can't
> tolerate that kind of anti-social blocking behavior ;-)

Make sense.

> 
>> #=========================================================
>>
>> 6. @all gentoo users, there is also a bug in the init-script of
>> heartbeat (2.0.7-r2) ha_logd not starting and stopping - bug reported
>> (http://bugs.gentoo.org/show_bug.cgi?id=155106) - patch attached
>> (heartbeat.ha_logd.diff).
> 
> Is this in our source base?

No, it's the gentoo specific init-script of heartbeat which failed to
start and stop ha_logd.

> 
>> #=========================================================
>>
>> 7. I think the logging of heartbeat should be improved to a more
>> transparent and readable format(!?).
> 
> I think the big problem is how much we do (that is we log things no one
> cares about), and secondarily how clear the messages are.  I don't think
> things like foo[pid}: are the problem.  But maybe you don't think that's
> the real problem either.

Especially the clearness of the heartbeat logfile could be improved, for
example when i think about the cib.xml diff's in the logfile...

> 
> 

Regards,
Michael

--

IT-Systemadministrator Avira GmbH
www.avira.com

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