Securing  Apache web server:

Apache modules: Turn off modules you are not going to use. With past ssl exploits, those using this philosophy did not get burned.

Red Hat EL 5/CentOS 5 Apache 2.2: The configuration file /etc/httpd/conf.d/ssl.conf enables SSL by default. This file is picked up from the line Include conf.d/*.conf in the file /etc/httpd/conf/httpd.conf Rename the file /etc/httpd/conf.d/ssl.conf to …

Phusion Passenger is an Nginx module, which makes deploying Ruby and Ruby on Rails applications. It follows the usual Ruby on Rails conventions and ease of setup, while at the same time providing enough flexibility and reliability.
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Easiest way to install Phusion Passenger
1. Open a terminal, and type:
gem install passenger
2. Type:
passenger-install-apache2-module
Or, if you want to install the Nginx version instead:
passenger-install-nginx-module
And follow the instructions.
If you encounter any problems, please read the Users guide (Apache)/Users guide (Nginx) for troubleshooting tips and/or try the …

What is Yum?
” Yum is an automatic updater and package installer/remover for rpm systems. It automatically computes dependencies and figures out what things should occur to install packages. It makes it easier to maintain groups of machines without having to manually update each one using rpm.
Features include:
* Multiple Repositories
* Simple config file
* Correct dependency calculation
* Fast operation
* rpm-consistent behavior
* comps.xml group support, including multiple repository groups
* Simple interface”
1. Installation
The best part of this howto is you have to just install …

open the file repository file
/etc/yum.repos.d/example.repo or you can turn it off globally for all the repositories by editing yum.conf also.
and turn the gpgcheck=1 to gpgcheck=0 , restart yum
and try installing the package once again using yum and it should work now.