I have a web server which is randomly becoming unresponsive. I've checked for hardware problems with no luck :
- no ethernet errors
- no disk errors
- no memory errors
So far I've managed to point the trouble at the web server since if I restart httpd (apache) it comes back to normal.
This is not a shared server so I control (or at least like to think of) what is hosted so I have two suspects:
a) my own code is behaving strangely. For example, a php script that in a given situation/parameters increases the usage.
b) some sort of attack. Either in conjunction to a or other vulnerability.
I am looking for advices in how can I pin point since looking at every line of code would be infeasible.
Centos 5.5 / apache / php 5.2.10
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