On 7/18/06, Robert Fox <[EMAIL PROTECTED]> wrote:
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,
Could be a library linked to php blocking on some resource someplace.
Any other non-standard modules in use?
You might try getting some backtraces of stuck parent and child processes:
http://httpd.apache.org/dev/debugging.html#backtrace
Joshua.
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