rvm use '2.4.3'
rvm gemset create rails4 rails5
# ruby-2.4.3 - #gemset created /home/vagrant/.rvm/gems/ruby-2.4.3@rails4
# ruby-2.4.3 - #generating rails4 wrappers........
# ruby-2.4.3 - #gemset created /home/vagrant/.rvm/gems/ruby-2.4.3@rails5
# ruby-2.4.3 - #generating rails5 wrappers........
######## Rails4 Project
rvm use '2.4.3@rails4'
# Using /home/vagrant/.rvm/gems/ruby-2.4.3 with gemset rails4
gem install rails -v '4.2.10'
rails new 'my_rails4_project' --skip-bundle
######## Rails5 Project
rvm use '2.4.3@rails5'
# Using /home/vagrant/.rvm/gems/ruby-2.4.3 with gemset rails5
gem install rails -v '5.1.5'
rails new 'my_rails5_project' --skip-bundle