On 2008-06-25T11:30:54, Joe Bill <[EMAIL PROTECTED]> wrote:
> Ok. What I failed to realize was that any cross-network dialog between
> ha_logger and syslog via ha_logd was anyways asynchronous, and
> whatever dialog between ha_logger and ha_logd is local inter-process
> (independent from the network), and so ha_logger can not be affected
> by the state of the network. So the risk of ha_logger failing and
> forcing ha_log() to write to disk is merely the same as ha_logd
> crashing, which itself represents serious system integrity
> degradation.
Right.
> I've checked cl_log.c, namely the cl_direct_log function.
> It appears that the daemon will write to the specified logfile, ***regardless
> of it relaying to syslog or not***, if a log filename is provided, and the
> priority of the message to log is not DEBUG.
> May I kindly ask you to confirm my interpretation is correct ?
Right. This allows you to both log to syslog and a file.
> Personally, I believe "it" would be the "ha_logger", and yes, wouldn't it be
> cool if the ha_logger could talk directly to a syslog daemon.
Definitely not. That would lose the advantages of decoupling our logging
from syslog or file blocking.
> > The point is to decouple the cluster stack from the possibly
> > blocking write() call, either to the syslog socket or the disk.
> So does ha_logd save over reboots messages it received from the logger
> but hasn't had time to process ?
The messages are kept in memory and flushed before shutdown, yes. So
there is no need to save anything over a reboot.
> > You should not set this manually. This is set in the
> > configuration and the RA should not mess with it.
> Well, say I write a RA that I believe should log to the cron log facility.
> How am I to do that while using the ocf-shellfuncs ?
RAs should follow the logging configuration of the HA subsystem. I think
that is a very good idea.
If you want to violate that or do anything special, you would probably
be calling logger directly.
Regards,
Lars
--
Teamlead Kernel, SuSE Labs, Research and Development
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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