Install ruby 1.9 on CentOS with rvm (ruby version manager)

install-rvm-ruby-1.9

#Step 1: Upgrade Packages 
yum update
yum groupinstall "Development Tools"

#Step 2: Installing Recommended Packages
yum install gcc-c++ patch readline readline-devel zlib zlib-devel 
yum install libyaml-devel libffi-devel openssl-devel make 
yum install bzip2 autoconf automake libtool bison iconv-devel

#Step 3: Install RVM ( Ruby Version Manager ) 
curl -L get.rvm.io | bash -s stable

#Step 4: Setup RVM Environment 
source /etc/profile.d/rvm.sh

#Step 5: Install Required Ruby Version
rvm install 1.9.3

#Step 6: Install Another Version ( if Required ) 
rvm install 1.8.6

#Step 7: Setup Default Ruby Version
rvm use 1.9.3 --default 

#Step 8: Check Current Ruby Version 
ruby --version


#Update rubygems
gem update --system
gem install bundler
#Test ruby and rubygems are working
#Close shell and reopen for changes to take effect
ruby -v
gem --version

rvm reset if using chef/knife to reset ruby environment