install or update ruby and rails on centos

install or update ruby and rails on centos.txt

#Remove old Ruby
$ yum remove ruby
 
# Install dependencies
$ yum groupinstall "Development Tools"
$ yum install zlib zlib-devel
$ yum install openssl-devel
$ wget http://pyyaml.org/download/libyaml/yaml-0.1.5.tar.gz
$ tar xzvf yaml-0.1.5.tar.gz
$ cd yaml-0.1.5
$ ./configure
$ make
$ make install
 
# Install ruby
$ wget http://ftp.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.gz
$ tar zxf ruby-2.1.0.tar.gz
$ cd ruby-2.1.0
$ ./configure
$ make
$ make install

# if you use proxy, create ~/.gemrc file containing :
# http_proxy: http://proxy:3128

# Update rubygems
$ gem update --system
$ gem install bundler
 
#Test ruby and rubygems 
$ruby -v
$gem --version
 
# Rails
$ yum install sqlite-devel
$ gem install rails
$ gem install sqlite3