Topic: Unknown reason for 100% cpu usage

[phil7269]

I have an website running on Apache 2.2.22 and ubuntu 12.04. php version is 5.3.10

Up until July 3rd at 8am, CPU utilization would average between 10-20%. Very rarely would it go higher, as this server host a web application for internal use only. Today, July 7th, I was informed the application is performing extremely slow. using htop I see that Apache is using all the available CPU, and has been since July 3rd. When I run a netstat I see over 4000 connections which are as follows (each connection to a different port):

tcp 0 0 app.somedomain.com:http app.somedomain.com:55815 TIME_WAIT

How do I go about finding what is causing this issue? TIA for your assistance.

Below are some settings from the apache2.conf file:

MaxKeepAliveRequests 100
KeepAliveTimeout 5

<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 150
MaxRequestsPerChild 0
</IfModule>

<IfModule mpm_worker_module>
StartServers 2
MinSpareThreads 25
MaxSpareThreads 75
ThreadLimit 64
ThreadsPerChild 25
MaxClients 150
MaxRequestsPerChild 0
</IfModule>

<IfModule mpm_event_module>
StartServers 2
MinSpareThreads 25
MaxSpareThreads 75
ThreadLimit 64
ThreadsPerChild 25
MaxClients 150
MaxRequestsPerChild 0
</IfModule>

[phil7269]

Figured out the issue. mount point needed to be disconnected and reconnected.