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We have a suite of ruby applications at Braintree. There are many times when we need to run more than one of these apps at the same time. For example, we might need to run our login app in addition to whichever app we are working on.

We use foreman as our process launcher, but foreman does not handle running other projects in other rvm gemsets (and possibly ruby versions). One of my fellow developers, Tony Pitluga, released a gem called subcontractor that handles these cases.

For example, our Procfile looks like:

app: rails server
login: subcontract --rvm "--with-rubies rvmrc" --chdir ../login --signal INT -- rails server -p 4000

This runs the current app on port 3000 and the login app on port 4000 with a different home folder, ruby and gemset. The login line is roughly equivalent to running cd ../login && rvm --with-rubies rvmrc exec rails server -p 4000 The option --with-rubies rvmrc tells rvm to use the .rvmrc file to load the correct ruby and gemset. If a project doesn’t have an .rvmrc file, you can specify the ruby version:

another_app: subcontract --rvm ruby-1.8.7-p249@another_app --chdir ../another_app --signal INT -- rails server -p 4000