Kevin C kceb

Gem Install Dockerfile Hack

If you're hacking on your Gemfile and using Docker, you know the pain of having the bundle install command run after you've added or removed a gem. Using docker-compose you could mount a volume and stage your gems there, but this adds additional complexity and doesn't always really solve the problem.

Enter this imperfect solution:

What if we installed every gem into it's own Docker layer which would be happily cached for us?

gem-inject-docker does just that. It takes the list of gems used by your app via bundle list and transforms it into a list of RUN gem install <your gem> -v <gem version> statements and injects them into the Dockerfile at a point of your choosing.

	# Amazon Elastic Beanstalk

	## Grand the access to node command

	1. sudo su
	2. vipw
	3. nodejs:x:496:494::/tmp:/bin/bash (":wq" to save changes)
	4. sudo su nodejs
	5: PATH=$PATH:`ls -td /opt/elasticbeanstalk/node-install/node-* \| head -1`/bin
	6: node -v (enjoy :)

	container_commands:
	# directory '/var/app/current'
	# threads 8, 32
	# workers %x(grep -c processor /proc/cpuinfo)
	# bind 'unix:///var/run/puma/my_app.sock'
	# pidfile '/var/run/puma/puma.pid'
	# stdout_redirect '/var/log/puma/puma.log', '/var/log/puma/puma.log', true
	# daemonize false

	01backup_config:

	Sidekiq::BatchSet.new.each { \|batch\| Sidekiq::Batch::Status.new(batch.bid).delete }
	Sidekiq::Queue.all.each(&:clear)