The Ubuntu Intrepid - Setup article covered securing, updating, and personalizing the installation. Now you are ready to add some working software, Ruby on Rails.
This article has been updated to use the latest (at the time of writing) version of RubyGems, version 2.2.0, and Ruby on Rails version 4.0.2.
Although Ruby is available via package management systems the version is usually quite stale. Although doing so might take some time, the best way to ensure that you get the proper versions for Ruby and RubyGems is to compile from source.
The following packages will enable you to compile Ruby as well as necessities for Rails. Run the following command to download them:
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev nodejs
To compile Ruby, you need to download the source. The best place to do that is directly from the Ruby-Lang website.
This web page lists all of the stable current versions of Ruby, including the most current stable version. Although this article uses 2.1.0, you can choose 2.0.0 or 1.9.3, both of which compile and install RubyGems in the same way. All versions are compatible with Rails 4.x.
Create a directory for your source and install Ruby as follows:
mkdir src && cd src
tar -xzvf ruby-2.1.0.tar.gz
make && sudo make install
After Ruby is installed, you can check the version by running the following command:
ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-linux]
Because you compiled from source, RubyGems is also installed. Verify its version by running the following command:
To ensure that you have the latest version of RubyGems, you can run the following command:
gem update –system
Now that Ruby and RubyGems is installed, you can install the Rails framework.
Run the following command:
sudo gem install rails
This process will take some time and install all of the necessary gems required for Rails to function normally.
After the command has finished running, you can check the Rails version by running the following command:
To create an application, you can simply run the following command:
rails new sampleapp
This command creates all of the necessary files and directory structure inside of a new directory called sampleapp.
By default, Rails uses SQLite as a database. However, you can also use MySQL when creating a new application.
To install MySQL, you need the MySQL client-dev package, and the Ruby MySQL library in order for the database connector to work. Run the following command:
sudo apt-get install libmysqlclient-dev libmysql-ruby
After the installation is complete, you can create a new application with the MySQL adapter, first by installing the gem, and then by creating the application, as follows:
sudo gem install mysql2
rails new sampleapp –d mysql
Finally, you need to install Postfix so that you can send email from your Rails applications. Run the following command:
sudo apt-get install postfix -y
Answer the Postfix installation questions as you see fit. The defaults usually suffice if you are using it only to send email and not to receive email.
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