07-09-2012
Apache memory utilization issue
Hi,
I have been running into an issue wherein suddenly an apache process eats up lots of memory and system starts swapping. It causes the server to hang due to io-wait. I am able to trace the process/thread which is eating up memory, however, am unable to figure out which webpage is causing it. Pmap shows lots of anonymous memory blocks of different sizes are allocated to that processs.
Ours is a python based setup and we use mod_wsgi with apache.
I was able to figure out one such webpage through a vulnerability scanner and fix the issue. However, another one is still pending. Is there any way to figure out the page currently being served by an apache thread?
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LEARN ABOUT DEBIAN
apache::qpsmtpd
Apache::Qpsmtpd(3pm) User Contributed Perl Documentation Apache::Qpsmtpd(3pm)
NAME
Apache::Qpsmtpd - a mod_perl-2 connection handler for qpsmtpd
SYNOPSIS
Listen 0.0.0.0:25 smtp
AcceptFilter smtp none
## "smtp" and the AcceptFilter are required for Linux, FreeBSD
## with apache >= 2.1.5, for others it doesn't hurt. See also
## http://httpd.apache.org/docs/2.2/mod/core.html#acceptfilter
## and http://httpd.apache.org/docs/2.2/mod/mpm_common.html#listen
LoadModule perl_module modules/mod_perl.so
<Perl>
use lib qw( /path/to/qpsmtpd/lib );
use Apache::Qpsmtpd;
$ENV{QPSMTPD_CONFIG} = "/path/to/qpsmtpd/config";
</Perl>
<VirtualHost _default_:25>
PerlModule Apache::Qpsmtpd
PerlProcessConnectionHandler Apache::Qpsmtpd
# can specify this in config/plugin_dirs if you wish:
PerlSetVar qpsmtpd.plugin_dirs /path/to/qpsmtpd/plugins
PerlSetVar qpsmtpd.loglevel 4
</VirtualHost>
DESCRIPTION
This module implements a mod_perl/apache 2.0 connection handler that turns Apache into an SMTP server using Qpsmtpd.
It also allows you to set single-valued config options (such as loglevel, as seen above) using "PerlSetVar" in httpd.conf.
This module should be considered beta software as it is not yet widely tested. However it is currently the fastest way to run Qpsmtpd, so
if performance is important to you then consider this module.
BUGS
Probably a few. Make sure you test your plugins carefully.
The Apache scoreboard (/server-status/) mostly works and shows connections, but could do with some enhancements specific to SMTP.
AUTHOR
Matt Sergeant, <matt@sergeant.org>
Some credit goes to <mock@obscurity.org> for Apache::SMTP which gave me the inspiration to do this.
perl v5.14.2 2009-04-02 Apache::Qpsmtpd(3pm)