Mod security is a web application firewall which protects apache from various types of attacks.

If you are using Centos/RHEL and tried to install mod_security, you may often get

No package found.

Here is how you make it to work.

1. Create a new file /etc/yum.repos.d/utterramblings.repo

2. Place the following lines in that file.

[utterramblings]
name=Jason's Utter Ramblings Repo
baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka

Finally,

yum install mod_security

Important:
That should work. If you get 404 error then replace the correct enterprise linux version (4 or 5)

baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/

to

baseurl=http://www.jasonlitka.com/media/EL5/$basearch/

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