Install Ruby on Rails on CentOS 6 with RVM

Step One— Install Ruby with RVM Before we do anything else, we should run a quick update to make sure that all of the packages we download are up to date:

sudo yum update

Once that's done, we can start installing RVM, Ruby Version Manager. This is a great program that lets you use several versions of Ruby on one VPS; however, in this case, we will just use it to install the latest version of Ruby on the droplet.

If you do not have curl on your system, you can start by installing it:

sudo yum install curl

To install RVM, open terminal and type in this command:

curl -L get.rvm.io | bash -s stable

After it is done installing, load RVM.

If you ran the installer as root, run: source /usr/local/rvm/rvm.sh

If you installed it through a user with access to sudo: source ~/.rvm/rvm.sh

In order to work, RVM has some of its own dependancies that need to be installed. You can see what these are: rvm requirements

In the text that RVM shows you, look for this paragraph.

Additional Dependencies:

  1. For Ruby / Ruby HEAD (MRI, Rubinius, & REE), install the following:

    ruby: yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison iconv-devel 

NOTE: For centos >= 5.4 iconv-devel is provided by glibc

Go ahead and download the recommended dependancies, being careful not to use sudo. Instead, we should use rvmsudo: rvmsudo yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison iconv-devel

Step Two—Install Ruby Once you are using RVM, installing Ruby is easy.

rvm install 1.9.3

Ruby is now installed. However, since we accessed it through a program that has a variety of Ruby versions, we need to tell the system to use 1.9.3 by default.

rvm use 1.9.3 --default

Step Three—Install RubyGems The next step makes sure that we have all the required components of Ruby on Rails. We can continue to use RVM to install gems; type this line into terminal.

rvm rubygems current

Step Four—Install Rails Once everything is set up, it is time to install Rails.

To start, open terminal and type in:

gem install rails

This process may take a while, be patient with it. Once it finishes you will have Ruby on Rails installed on your droplet.

NOTE: Additional info

Ruby 193

https://www.digitalocean.com/community/articles/how-to-install-ruby-on-rails-on-centos-6-with-rvm

yum.repo.d

http://people.redhat.com/bkabrda/scl_ruby193.repo

[scl_ruby193]
name=Ruby 1.9.3 Dynamic Software Collection
baseurl=http://people.redhat.com/bkabrda/ruby193-rhel-6/
failovermethod=priority
enabled=1
gpgcheck=0

/bin
ln -s ruby193-ruby ruby

scl enable ruby193 'gem install bundler'

https://gist.github.com/dlaxar/2995541