Ruby on Rails is one of the most popular application stacks for developers wishing to create sites and web apps. The Ruby programming language, coupled with the Rails development framework, makes app development simple.
Since Ruby on Rails doesn’t come in a neatly packaged format, getting the framework installed used to be one of the more difficult parts of getting started. Luckily, tools like rvm, the Ruby Version Manager, have made installation simple.
In this guide, we’ll show how to install
rvm on an Ubuntu 14.04 VPS, and use it to install a stable version of Ruby and Rails. Although you can go through these procedures as the root user, we’ll assume you’re operating using an unprivileged user.
The Quick Way
The quickest way of installing Ruby on Rails with
rvm is to run the following command as a regular user:
\curl -sSL https://get.rvm.io | bash -s stable --rails
You will be prompted for your regular user’s password as part of the installation procedure.
Let’s go over exactly what’s happening here.
\curl portion uses the
curl web grabbing utility to grab a script file from the
rvm website. The backslash that leads the command ensures that we are using the regular
curl command and not any altered, aliased version.
-s flag indicates that the utility should operate in silent mode, the
-S flag overrides some of this to allow
curl to output errors if it fails. The
-L flag tells the utility to follow redirects.
The script is then piped directly to
bash for processing. The
-s flag indicates that the input is coming from standard in. We then specify that we want the latest stable version of
rvm, and that we also want to install the latest stable Rails version, which will pull in the associated Ruby.
Following a long installation procedure, all you need to do is source the
rvm scripts by typing:
You should now have a full Ruby on Rails environment configured.
Installing Specific Ruby and Rails Versions
If you need to install specific versions of Ruby for your application, you can do so with
rvm like this:
rvm install ruby_version
After the installation, we can list the available Ruby versions we have installed by typing:
We can switch between the Ruby versions by typing:
rvm use ruby_version
We can use various Rails versions with each Ruby by creating
gemsets and then installing Rails within those using the normal
rvm gemset create gemset_name # create a gemset rvm ruby_version@gemset_name # specify Ruby version and our new gemset gem install rails -v rails_version # install specific Rails version
The gemsets allow us to have self-contained environments for gems and allow us to have multiple environments for each version of Ruby that we install.