Install Ruby on Rails on Linux

We are installing Ruby On Rails on Linux using rbenv. It is a lightweight Ruby Version Management Tool. The rbenv provides an easy installation procedure to manage various versions of Ruby, and a solid environment for developing Ruby on Rails applications.

Follow the steps given below to install Ruby on Rails using rbenv tool.

Step 1: Install Prerequisite Dependencies

First of all, we have to install git - core and some ruby dependences that help to install Ruby on Rails. Use the following command for installing Rails dependencies using yum.

tp> sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel

Step 2: Install rbenv

Now we will install rbenv and set the appropriate environment variables. Use the following set of commands to get rbenv for git repository.

tp> git clone git://github.com/sstephenson/rbenv.git .rbenv
tp> echo 'export PATH = "$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
tp> echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
tp> exec $SHELL

tp> git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
tp> echo 'export PATH = "$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' << ~/.bash_profile
tp> exec $SHELL

Step 3: Install Ruby

Before installing Ruby, determine which version of Ruby you want to install. We will install Ruby 2.2.3. Use the following command for installing Ruby.

tp> rbenv install -v 2.2.3

Use the following command for setting up the current Ruby version as default.

tp> rbenv global 2.2.3

Use the following command to verify the Ruby version.

tp> ruby -v

Output

ruby 2.2.3p173 (2015-08-18 revivion 51636) [X86_64-linux]

Ruby provides a keyword gem for installing the supported dependencies; we call them gems. If you don't want to install the documentation for Ruby-gems, then use the following command.

tp> echo "gem: --no-document" > ~/.gemrc

Thereafter, it is better to install the Bundler gem, because it helps to manage your application dependencies. Use the following command to install bundler gem.

tp> gem install bundler

Step 4: Install Rails

Use the following command for installing Rails version 4.2.4.

tp> install rails -v 4.2.4

Use the following command to make Rails executable available.

tp> rbenv rehash

Use the following command for checking the rails version.

tp> rails -v

Output

tp> Rails 4.2.4

Ruby on Rails framework requires JavaScript Runtime Environment (Node.js) to manage the features of Rails. Next, we will see how we can use Node.js to manage Asset Pipeline which is a Rails feature.

Step 5: Install JavaScript Runtime

Let us install Node.js from the Yum repository. We will take Node.js from EPEL yum repository. Use the following command to add the EPEL package to the yum repository.

tp> sudo yum -y install epel-release

Use the following command for installing the Node.js package.

tp> sudo yum install nodejs

Congratulations! You are now on Rails over Linux.

Step 6: Install Database

By default, Rails uses sqlite3, but you may want to install MySQL, PostgreSQL, or other RDBMS. This is optional; if you have the database installed, then you may skip this step and it is not mandatory that you have a database installed to start the rails server. For this tutorial, we are using PostgreSQL database. Therefore use the following commands to install PostgreSQL.

tp> sudo yum install postgresql-server postgresql-contrib

Accept the prompt, by responding with a y. Use the following command to create a PostgreSQl database cluster.

tp> sudo postgresql-setup initdb

Use the following command to start and enable PostgreSQL.

tp> sudo systemctl start postgresql
tp> sudo systemctl enable postgresql

Source: Tutorialpoint