If you don't know what is RVM, check it out.
Setting your project environment with rvmrc
rvmrc is a file which together with RVM makes sure you are always running the correct ruby version and gems for your application. You can set a project-specific environment with a file called
.rvmrc by running the following command in your project root:
$ rvm --rvmrc --create jruby-1.7.0@mygemset
Now as you enter your project-folder, RVM automatically selects jruby-1.7.0 and uses the rubygems installed in the gemset mygemset.
Simpler rvmrc file
Since RVM creates a slightly bloated
.rvmrc, you can also create the same environment file by manually writing it:
$ echo "rvm use jruby-1.7.0@mygemset" > .rvmrc
It is much cleaner and simpler to understand.
You probably never have to override your rvmrc. However I have an application which is using JRuby and I deploy it using Capistrano. Unfortunately JRuby doesn't properly support Capistrano and I have to deploy the application by running:
$ rvm ruby-1.9.3-p327 do cap deploy