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Cloud Foundry buildpack: Erlang

This is a Cloud Foundry buildpack for Erlang apps. It uses Rebar.

It was adapted from a Heroku Buildpack with just a couple things changed to be CF compatible.

Select an Erlang version

The Erlang/OTP release version that will be used to build and run your application is now sourced from a dotfile called .preferred_otp_version. It needs to be the branch or tag name from the http://github.com/erlang/otp repository, and further, needs to be one of the versions that precompiled binaries are available for.

Currently supported OTP versions:

  • master (R17B pre)
  • master-pu (R16B pre)
  • OTP_R15B
  • OTP_R15B01
  • OTP_R15B02
  • OTP_R16B
  • OTP_R16B01
  • OTP_R16B02
  • OTP_R16B03

To select the version for your app:

$ echo OTP_R15B01 > .preferred_otp_version
$ git commit -m "Select R15B01 as preferred OTP version" .preferred_otp_version

Create a Procfile for CF to run

Rebar projects must be run with the appliaation name, so it must be defined in a Procfile

$ echo "web: erl -pa ebin deps/*/ebin -noshell -s <app name>" > Procfile
$ git commit -m "Added Procfile" Procfile

Build your CF App

$ cf push <app name> -b https://github.com/spiegela/cf-buildpack-erlang

You may need to write a new commit and push if your code was already up to date.