Agnello George wrote:
On 8/29/08, *Gaurav Pruthi* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Dear Friends,
I am facing very strange problem. I have a LAMP server. It has
around 400 of websites hosted on it. Since last one month the server
load increases suddenly. When checked using top command, i saw
apache process consuming 99% of CPU. After i kill httpd and starts
it again (or using HUP), load comes down to the normal. It happens
8-10 times each day. I am unable to find what could cause the apache
to consume all the resources of server and causing server to hang.
Kindly help me to resolve this issue.
Could you tell us the Server-Pool Size Regulation mentioned in the
httpd.conf
--
Regards
Agnello D'souza
www.linux-vashi.blogspot.com <http://www.linux-vashi.blogspot.com>
www.bible-study-india.blogspot.com
<http://www.bible-study-india.blogspot.com>
The cause for this load could be explained in many ways.
1. Poor scripts
Look in error_log or php_error.log for something suspicious
2. Increase of visitors (the holiday is off)
I'm use to such increase of traffic in this month
3. Attacks
Look for suspicious connections. A ps -ax|grep -c httpd could tell you
how many apache child are running. If you rich the max number of clients
it could be a problem.
Try
netstat -ntu | grep SYN_RECV | awk '{print $5}' | cut -d: -f1 | sort |
uniq -c | sort -nr to see how many connections you have/ip
Apachetop could be a better tool for analyzing the apache load. you can
see the top requested files/sites
It can also be e matter of suddenly increase the number off visitors
versus the ability of the apache server to provide requested child
processes. For this matter look for the configuration options
KeepAliveTimeout
MinSpareServers
MaxSpareServers
StartServers
MaxClients
MaxRequestsPerChild
Also it could be a good ideea to limit the traffic. You can try
mod_evasive, mod_gzip, mod_expires, etc
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