Setting Up rbenv on Linux to Switch Ruby Versions

Overview

The Ruby version on the server was outdated, so these are my setup notes from when I switched the Ruby version using rbenv.

setup rbenv

$ git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
$ git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
$ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

$ source ~/.bash_profile
$ rbenv --version
rbenv 1.1.1-30-gc8ba27f

Install Ruby 2.5.0 via rbenv

$ rbenv install 2.5.0

// The current version is system. It hasn't switched to 2.5.0 yet
$ rbenv versions
* system (set by /home/vagrant/.rbenv/version)
  2.5.0

// Switch to 2.5.0
$ rbenv global 2.5.0

// Confirm the switch
$ rbenv versions
  system
* 2.5.0 (set by /home/vagrant/.rbenv/version)

$ ruby -v
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]

// Without a refresh, the paths under .rbenv/versions/2.5.0/bin won't be picked up
$ rbenv rehash