Windows – Cacti Graphing CPU / Memory utilization over time

Have observed "exit signal Segmentation fault (11)" error lot of times. This happens when some scripts dont complete while apache crashes.

If you are using PHP based website on apache this is very likely to happen.

If at all you are using PHP, check following config in php config in conf.d/php.conf:

<Files *.php>
    SetOutputFilter PHP
    SetInputFilter PHP
    LimitRequestBody 524288
</Files>

Remove the LimitRequestBody line. and observe. The error should go away.

Also if you are using apache with php following versions work perfectly. apache 2.0.43 and php 4.3.0_RC1

Note: This answer is purely based on my past research on the error and issue faced by me. Let me know your current configuration and feedback.

You might want to look at Munin, which is very easy to setup, especially if you're just running it locally. It will let you quickly start tracking CPU load and other resources without having to mess with SNMP and remotely grabbing resource data. There are packages for RedHat that should be quite simple to install.