application_buildpack

Description

This cookbook is designed to be able to deploy applications using heroku buildpacks.

The following buildpacks are tested and supported:

• ruby
• nodejs

Note that this cookbook is based on the application cookbook; you will find general documentation in that cookbook.

Requirements

Chef 11.0.0 or higher required (for Chef environment use).

The following Opscode cookbooks are dependencies:

• monit
• application

Resources/Providers

The LWRP provided by this cookbook is not meant to be used by itself; make sure you are familiar with the application cookbook before proceeding.

compile

The compile sub-resource LWRP deals with compiling an app using a buildpack.

Attribute Parameters

• buildpack: The buildpack to be used. Will be used to install dependencies and set the buildpack repository. Default: nil. Options: :ruby, :nodejs
• buildpack_repository: A custom buildpack repository that should be used instead. Default: nil.
• buildpack_revision: The revision of the buildpack to be used. Default: master.
• buildpack_environmet: Additional ENV variables to be passed to the buidlpack compile script. Default: {}.

scale

The scale sub-resource LWRP deals with configuring monit to start processes described in your Procfile.

Attribute Parameters

You can pass any attribute combination to scale the name of the attribute will be matched to a process describe in your Procfile.

scale do
  # scale with one process
  web 1

  # scale with multiple processes
  # PROCESS_NUM env variable will indicate the processes id
  worker 4

  # send a custom signal on reload to gracefully stop the process
  guard 1, reload: 'USR1'
end

Usage

A sample recipe that deploy a Ruby app:

application 'example' do
  path '/srv/example'

  owner 'ubuntu'
  group 'ubuntu'

  packages ['git']
  repository 'https://github.com/heroku/ruby-rails-sample.git'

  environment 'PORT' => 8000

  compile do
    buildpack :ruby
  end

  scale do
    web 1
  end
end

A sample recipe that deploys an scala app using a custom buildpack

application 'example' do
  path '/srv/example'

  owner 'ubuntu'
  group 'ubuntu'

  packages ['git']
  repository 'https://github.com/heroku/scala-sample.git'

  compile do
    buildpack_repository 'https://github.com/heroku/heroku-buildpack-scala.git'
  end

  scale do
    web 1
  end
end

Troubleshoot

• If the buildpack fails to compile because some packages are missing, just define the packages in your application LWRP: packages ['lib-imagemagick'].
• If the buildpack fails to compile due to a missing /app directory then the buidlpack uses hardcoded heroku paths. Create an issue on the repository or fork it.

Credits

Thanks to:

• progrium for https://github.com/progrium/buildstep
• Granicus for https://github.com/Granicus/chef-application_procfile