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Ruby Version Manager (RVM) is a utility that allows you to add your own personal version of Ruby to a user. It allows you to add, remove, or have multiple versions of Ruby and its libraries live in your user directory.

This article walks you through how to manually install RVM as well as a custom version of Ruby and/or Rails. Once complete, you can then enable Passenger within your panel and select which version of Ruby you wish to use with your site.

Installing RVM

To get started, you'll first need to install RVM under your shell user and set it up to load automatically. Visit the Enabling Shell Access article to make sure your user is a Shell user. Then you can log in to your server via SSH to run the following commands in your users directory.

  1. Install RVM's public keys:
    gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

    This creates a new folder under your user named /.gnupg with the public key.

  2. Install the latest stable version of RVM:
    curl -sSL https://get.rvm.io | bash -s stable

    This command does the following three things:

    • Creates a new folder under your user named /.rvm
    • Adds this line to your .bash_profile
    [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session *as a function*
    • Adds this line to your .bashrc file:
    export PATH="$PATH:$HOME/.rvm/bin" # Add RVM to PATH for scripting
  3. Run this to unset your GEM_HOME:
    unset GEM_HOME
  4. Run this to source your new RVM install:
    source ~/.rvm/scripts/rvm
  5. Add this to your .bashrc file
    source .bash_profile
  6. Run this command to update your .bash_profile:
    . ~/.bash_profile
  7. Now check if RVM is installed and functioning:
    rvm --version
    rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]

Installing any version of Ruby you wish

Once RVM is configured, you can install any version of Ruby you like. Run the following to get a list of available versions to install:

rvm list known

Install the exact version of Ruby you require. This example installs version 2.2.2:

rvm install 2.2.2

You can now tell your system to use this version by default:

rvm use 2.2.2 --default

Check the version of Ruby to confirm it's been updated.

ruby -v
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]

Installing any version of Rails you wish

Run this command to install the latest version of Rails:

gem install rails

Or you can install a specific version:

gem install rails --version 4.2.1

View a full list of available versions at rubygems.org:

Enabling RVM using the DreamHost panel

You can now visit the How to Enable RVM article to specify the version of Ruby you installed above for any specific domain running Passenger.

See also