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Date: Mon, 24 Jul 2006 13:46:54 -0400
From: Robert Fox <rfox2@nd.edu>
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Subject: Re: [users@httpd] Apache fails to restart

Rob-

Thanks for the response.

This is definitely not a configuration issue. The error logs don't seem to indicate why only one process starts, but the 
children fail to start. I get a normal startup message in the logs. The only thing that clears this is re-booting the host.

Are there other places where I could look?

Rob

Rob Wilkerson wrote:
> I'd check your config first.  I forget the syntax for Redhat, but for
> my Knoppix system it's "/usr/sbin/apache2 -t".  To check your system,
> locate the httpd executable and display it's help:
> 
> "/path/to/httpd -h"
> 
> Then, assuming everything checks out, check /var/log/httpd.  Hopefully
> this will provide enough info to move forward.
> 
> On 7/24/06, Robert Fox <rfox2@nd.edu> wrote:
> 
>> Hello again-
>>
>> I haven't received any responses on this, so I thought maybe I could 
>> simplify my question. If Apache fails to restart,
>> where should I look to find out why? The log files? System logs? Other 
>> Apache files (which ones)? Should I run a
>> diagnostic while Apache is frozen? What should I look for?
>>
>> Thanks very much for any replies. I'm starting somewhat from ground 
>> zero here.
>>
>> Rob Fox
>>
>> -------- Original Message --------
>> Subject: Apache overwhelmed, restart fails
>> Date: Tue, 18 Jul 2006 11:42:07 -0400
>> From: Robert Fox <rfox2@nd.edu>
>> To: users@httpd.apache.org
>>
>> Hello-
>>
>> We've been using Apache 2 here at Notre Dame libraries for several 
>> years now, and for the most part, the performance has
>> been very reliable. However, there have been times during very peak 
>> usage periods when the Apache servers will freeze
>> and essentially stop responding to further requests. We have several 
>> CGI applications running under the server that can
>> be taxing, and sometimes Apache seems to get overwhelmed, and the 
>> maximum number of available server spawns are reached.
>>
>> When this happens, I've tried to restart Apache by first shutting it 
>> down and then starting the server again. However,
>> what usually happens is that the first server process will start, and 
>> child processes do not spawn. This renders Apache
>> useless again, and I'm usually forced to completely re-boot the server 
>> machine on which Apache is running in order to
>> clear RAM and reset the network connections. Then, Apache comes up and 
>> everything is fine until the next incident. Here
>> are some specs on our installation:
>>
>> Server version: Apache/2.0.54
>> OS Version: Red Hat EL 3.0 (kernel 2.4.21-4.ELsmp)
>> Modules loaded: PHP 5, authentication modules, etc.
>>
>> The CGI applications are mainly Perl based.
>>
>> I've looked in the Apache logs (both main and error) and there is no 
>> indication that the server is failing around the
>> time that Apache freezes up. It seems odd that I can't stop the Apache 
>> servers and restart them, which solves 90% of
>> these sorts of issues with Apache. Except for administrative purposes, 
>> I rarely need to restart Apache, so this isn't a
>> major issue. But, I would like to know where to look to try and 
>> determine what is happening when I'm unable to restart
>> Apache. It's odd that the first process would start but the child 
>> processes won't. Any ideas?
>>
>> Thank you for your help,
>>
>> Rob Fox
>>
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