RE: [ic] IC not responding

["Ron Phipps" <suppressed>]

> From: suppressed
[mailto:interchange-users-
> suppressed On Behalf Of John1
> Sent: Monday, November 14, 2005 4:06 PM
> 
> On Monday, November 14, 2005 7:12 PM, suppressed wrote:
> 
> > Ron Phipps wrote:
> >>> From: suppressed
> >>
> >> [mailto:interchange-users-
> >>
> >>> suppressed On Behalf Of suppressed
> >>> Sent: Friday, November 11, 2005 11:24 AM
> >>>
> >>> On Fri, Nov 11, 2005 at 08:40:30AM -0800, Ron Phipps wrote:
> >>>
> >>>
> >>>> We've got a weird issue going on right now where all of a sudden
IC
> >>>> will
> >>>> stop servicing requests and utilization of the server goes to
just
> >>>> about
> >>>> 0.  If I restart IC everything goes back to normal.  This has
gone on
> >>>> for the last 3 days at different points in the day.  The ip
address
> >>>
> >>> The next time this happens, restart apache instead of IC and tell
me
> if
> >>> it goes back to normal.  If it does, then I have more to say about
> >>> the issue and also have a potential fix.
> >>>
> >>> Jeff
> >>
> >>
> >> Unfortunately this was not the case.  The potential fix of using
> >> apache's MaxRequestsPerChild 1000-5000 did not seem to help.
> >>
> >> Does anyone know of a way to troubleshoot IC, perhaps with debug
> >> statements to see why it can no longer handle requests?  IC is
still
> >> running, I can see all the rpc servers, however they do not take up
> >> much cpu usage and it's almost like they are not even there.
> >> Apache/mod_interchange does not error out and a restart of IC
> >> instantly allows Apache to start handling requests again.
> >
> > First of all you should try to strace all the IC processes to see if
> > it does system calls and watch your logfiles (IC and system
logfiles) as
> > well. If no system calls happened it might caught up in an infinite
> > loop somewhere.
> Do you know if you are bumping up against your Apache MaxClients
setting
> (in
> httpd.conf)?
> 
> i.e. Can you see the following entry in your Apache error.log when the
> problems start?
> "server reached MaxClients setting, consider raising the MaxClients
> setting"
> 
> Just a possibility, as we are having a similar problem (but may be
> unrelated
> to yours) caused by bumping up against Apache MaxClients (which I have
> just
> posted to mailing list as "mod_interchange and Apache MaxClients").
> 

Thanks for this information, I was looking in the error log for the
particular vhost and had not looked in the apache site wide error log,
and sure enough I see each time the server "went down" the max clients
reached error.  I'm currently at 256 max clients, I'm going to raise
that to 1024 tonight after I recompile apache.  We've also noticed
during the times this issue has occurred that we are being crawled by
search engines and also have scripts trying to look for holes in our
apache install.

Thanks for your help!
-Ron

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