Please advise how can I install mod_security ?
Hello,
To install mod_security you can use a default installation guide available in the archive with sources, and/or check the following links:
https://github.com/SpiderLabs/ModSecurity/wiki
https://github.com/SpiderLabs/ModSecurity/wiki/Reference-Manual
Anyway, as it was already mentioned if you have no experience with it you'd better not start it on your production server, try it instead on a test/development server and see how much it suits your needs.
I second that. You'll have to write lots of exception rules, will have slower pings and might have lock ups when attacked. Installing it is the easy part.if you don't have a knowledge about that, do not use it!
you have easy tool, to install that:
http://forum.directadmin.com/showthread.php?t=22587
have a good luck