Communication between two processes on geroku (which port to use)

Question

I have a Procfile file:

web:     bundle exec rails server -p $PORT
em:      script/eventmachine

The process emfires eventMachine using start_server(port ENV['PORT']), and my web process sometimes needs to communicate with it.

My question is, how does the web process know which port it is talking to? If I understand the hero correctly, he assigns you a random port when the process starts (and it can change if ps is killed or restarted). Thank!

Answer 1

Processes are isolated and cannot communicate directly with each other.

http://www.12factor.net/processes

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http://en.wikipedia.org/wiki/FIFO

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Answer 2

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https://blog.heroku.com/archives/2013/5/2/new_dyno_networking_model

Answer 3

Heroku,

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