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 as shown in steps 1-4 in this guide.
The quickest way of installing Ruby on Rails with
rvm is to run the following commands as a regular user:
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 \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.
gpg command contacts a public key server and requests a key associated with the given ID. In this case we are requesting the RVM project’s key which is used to sign each RVM release. Having the RVM project’s public key allows us to verify the legitimacy of the RVM release we will be downloading, which is signed with the matching private key.
\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.
If you need to install specific versions of Ruby for your application, you can do so with
rvm like this:
<pre> rvm install <span class=“highlight”>ruby_version</span> </pre>
After the installation, we can list the available Ruby versions we have installed by typing:
We can switch between the Ruby versions by typing:
<pre> rvm use <span class=“highlight”>ruby_version</span> </pre>
We can use various Rails versions with each Ruby by creating
gemsets and then installing Rails within those using the normal
<pre> rvm gemset create <span class=“highlight”>gemset_name</span> # create a gemset rvm <span class=“highlight”>ruby_version</span>@<span class=“highlight”>gemset_name</span> # specify Ruby version and our new gemset gem install rails -v <span class=“highlight”>rails_version</span> # install specific Rails version </pre>
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.
We have covered the basics of how to install
rvm and Ruby on Rails here, but there is a lot more to learn about
rvm. Check out our article on how to use rvm to manage your Ruby environments to learn more about working with rvm.
<div class=“author”>By Justin Ellingwood</div>
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