[users@httpd] Troubleshooting Tips?

[Evan Klitzke <ek...@gmail.com>]

Hi everyone,

I am a junior sysadmin (well, intern actually) at a company using
Apache. Right now I am tasked with migrating one of our servers to a
newer machine, and this involved doing more work with Apache than I have
done previously. I encountered a problem where turning on mod_perl would
cause Apache to run _really_ slowly (as in taking a minute to return a
small plain HTML page). In this case, I was sort of at a loss on how to
figure out what was causing the problem. The access and error logs
in /var/log/apache2 weren't showing anything helpful. The man page
indicated that I might be able to get some debugging output using the -X
option and starting apache at the command line, but I didn't get any
output (probably apache didn't consider anything that was going on
seriously amiss). Since this is something that will come up in the
future again I'm sure, I'm wondering: what is the best way to
troubleshoot Apache problems? Is there a way to turn on really verbose
logging, or to otherwise figure out what the heck is going on when
Apache spends 2-3 minutes just starting itself? This is especially
pertinent when Apache isn't actually encountering errors, it is just
running an order of magnitude more slowly than it ought to be. I realize
there's strace, but using it on something as big and complex as Apache
is somewhat daunting.

Thanks a lot!
Evan Klitzke


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Re: [users@httpd] Troubleshooting Tips?

[Octavian Rasnita <or...@gmail.com>]

If it happends only the first time or the first few times you access a 
certain page and it uses mod_perl, check if the modules used by that program 
are preloaded at server startup.

Octavian

----- Original Message ----- 
From: "Evan Klitzke" <ek...@gmail.com>
To: <us...@httpd.apache.org>
Sent: Tuesday, February 06, 2007 2:21 AM
Subject: [users@httpd] Troubleshooting Tips?


> Hi everyone,
>
> I am a junior sysadmin (well, intern actually) at a company using
> Apache. Right now I am tasked with migrating one of our servers to a
> newer machine, and this involved doing more work with Apache than I have
> done previously. I encountered a problem where turning on mod_perl would
> cause Apache to run _really_ slowly (as in taking a minute to return a
> small plain HTML page). In this case, I was sort of at a loss on how to
> figure out what was causing the problem. The access and error logs
> in /var/log/apache2 weren't showing anything helpful. The man page
> indicated that I might be able to get some debugging output using the -X
> option and starting apache at the command line, but I didn't get any
> output (probably apache didn't consider anything that was going on
> seriously amiss). Since this is something that will come up in the
> future again I'm sure, I'm wondering: what is the best way to
> troubleshoot Apache problems? Is there a way to turn on really verbose
> logging, or to otherwise figure out what the heck is going on when
> Apache spends 2-3 minutes just starting itself? This is especially
> pertinent when Apache isn't actually encountering errors, it is just
> running an order of magnitude more slowly than it ought to be. I realize
> there's strace, but using it on something as big and complex as Apache
> is somewhat daunting.
>
> Thanks a lot!
> Evan Klitzke
>
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>   "   from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
> 


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