gems_on_centos.sh

#!/bin/bash

#installing ruby gems on centos 

#add the ruby repository
sudo echo '[ruby]' > /etc/yum.repos.d/ruby.repo
sudo echo 'name=ruby' >> /etc/yum.repos.d/ruby.repo
sudo echo 'baseurl=http://repo.premiumhelp.eu/ruby/' >> /etc/yum.repos.d/ruby.repo
sudo echo 'gpgcheck=0' >> /etc/yum.repos.d/ruby.repo
sudo echo 'enabled=0' >> /etc/yum.repos.d/ruby.repo

#get rid of existing ruby packages
sudo yum remove --enablerepo=ruby ruby ruby-rdoc ruby-irb ruby-devel ruby-libs ec2-ami-tools

#install ruby 1.8.6
sudo yum install --disablerepo=updates,base  --enablerepo=ruby ruby ruby-rdoc ruby-irb ruby-devel ruby-libs

#reinstall ami tools
wget http://s3.amazonaws.com/ec2-downloads/ec2-ami-tools.noarch.rpm
sudo rpm -Uvh ec2-ami-tools.noarch.rpm

#install ruby gems
wget http://production.cf.rubygems.org/rubygems/rubygems-1.3.6.tgz
tar -xzvf rubygems-1.3.6.tgz
sudo ruby setup.rb