Category: Installation

Check ruby is already installed in your system or not

$ ruby -v 

Install curl if not installed

$ sudo apt-get install curl

Check curl version by

$ curl --version

Install RVM

Execute the command in the terminal

$ curl -L https://get.rvm.io | bash -s stable

If the installation is done, close the terminal window and open it again to load the rvm into the shell

Check rvm version

$ rvm -v

rvm 1.25.30 (stable) by Wayne E. Seguin , Michal Papis  [https://rvm.io/]

List rvm known rubies

$ rvm list known

Use rvm to install ruby 1.9.3

$ rvm install 1.9.3

Check the ruby versions available

$ rvm list rubies

Check the ruby version by

$ ruby -v

If this again shows the message to install ruby, then set this ruby version as default

$ rvm use ruby-1.9.3-p547 --default

then check ruby -v

Make gem package up to date

$ gem update

Install Rails 3.2.19

$ gem install rails --version '3.2.19'

Check rails version

$ rails -v 

You are ready to go!

Get the stable version of rvm:

$ rvm get stable

Install Ruby 2.0

$ rvm install ruby-2.0.0

Create a Gemset;

$ rvm gemset create rails-4.0

Goto that gemset:

$ rvm use ruby-2.0.0-p247@rails-4.0

Install Rails 4.0

$ gem install rails --version=4.0

Create an rvmrc file in root folder:

$ vim rvmrc
$ rvm --rvmrc use ruby-2.0.0-p247@rails-4.0

uncomment the line gem ‘therubyracer’, platforms: :ruby from Gemfile

Start the server:

$ rails s

You are ready to go!!

Changes that you may need to perform while working with Rails 4 compared to old versions:

1. Check here for the New changes in Rails 4
http://net.tutsplus.com/tutorials/ruby/digging-into-rails-4/
http://www.alfajango.com/blog/rails-4-whats-new/
http://www.sitepoint.com/get-your-app-ready-for-rails-4/
2. If you are using devise gem use devise version 3 or above (http://blog.plataformatec.com.br/2013/05/devise-and-rails-4/)

First download the Ruby Version Manager (RVM) installer as follows

$ sudo bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer )

RVM requires to add relevant users to it’s group. Open the file like so:

$ sudo vim /etc/group

Edit the ‘rvm’ group (likely the last entry) to look like:

rvm:x:503:your_username
Run the install:

$ cd /usr/local/rvm/bin
$ sudo ./rvm-installer
...

“Upgrade of RVM in /usr/local/rvm/ is complete.”

I needed to reload the RVM to continue, this might not be required:

$ rvm reload

If it shows -bash: rvm: command not found

please close the terminal and start it again to load the RVM.

Now we can install the Ruby version. This will also install rubygems which is always useful…

$ rvm install 1.9.3 --with-openssl-dir=/usr
$ ruby -v
$ rvm use ruby-1.9.3-p327 --default

If you are getting nokogiri error like:

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

checking for libxslt/xslt.h… no

libxslt is missing.

then install

$ sudo yum install -y gcc ruby-devel libxml2 libxml2-devel libxslt libxslt-devel

Reference:
http://jamesmcfadden.co.uk/installing-ruby-on-rails-on-centos-5-8/