nagios.cmd write order (cronological?)

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Marcel Mitsuto Fucatu
Sugano
> Sent: Thursday, August 10, 2006 3:23 PM
> To: Patrick Morris
> Cc: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] nagios.cmd write order (cronological?)
> 
> On Wed, 2006-08-09 at 15:56 -0700, Patrick Morris wrote:
> > On Wed, 09 Aug 2006, Marcel Mitsuto Fucatu Sugano wrote:
> >
> > > Hi,
> > >
> > > Nagios 2.5, SuSE9.3.
> > > Syslog-ng 1.6.8.
> > >
> > > I am configuring some passive checks to be transported by
syslog-ng.
> > >
> > > So i've configured syslog to write directly to nagios.cmd.
Everything
> > > working fine, but as we are receiving check results from diferent
> > > distributed nagios servers, I wonder if whether or not msgs
written at
> > > nagios.cmd has to be cronological. I mean, if some distributed
server
> > > lost the synchronization with ntp, and the epoch time of one msg
gets
> > > written to the nagios pipe with a timestamp lower than the one
before
> > > that, will Nagios drop the delayed check result?
> > >
> > > Thanks for any comments on this matter.
> >
> > Timestamps are important, but the order isn't.
> >
> 
> By observation, it shows that timestamp and arrival (written) order
does
> matter! Does anyone else knows anything about concurrent writes to

Are you sure about that? My reading of commands.c (ver 2.3) is that the
timestamp (entry_time) is used for logging/debugging purposes only. This
is in line with my past experience.

> matter! Does anyone else knows anything about concurrent writes to
> nagios.cmd? Syslog-ng and nsca are writing to nagios.cmd pipe, but
nsca
> is configured to append mode.

Not really but... I'm surprised that using append mode for nsca works.
That was originally used because the external command file used to be a
real file, not a pipe. Since Netsaint 0.0.7 that functionality shouldn't
be used for Nagios' external command functions. Could it be that your
submissions to nagios.cmd are clobbering each other? Are they all atomic
writes under the max pipe size for your OS (~512 bytes)?

--
Marc

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null