Sample Docker configuration for Rails project

Docker configuration

Install Docker on OS X:

brew tap caskroom/cask
brew cask install docker-toolbox

Check if docker machine exists:

docker-machine ls

Create a new machine if it isn't there:

docker-machine create --driver virtualbox default

Besides VirtualBox, there are Docker Machine drivers for AWS, DigitalOcean and Scaleway.

Configure the shell by adding this to ~./bashrc, or ~/.zshrc, or ~/.config/fish/fish.conf:

eval $(docker-machine env default)

Remove $ if using fish.

Project specific actions

Build:

docker-compose build
docker-compose run app rails db:create db:setup

Get Docker machine IP:

docker-machine ip default

Build and start all containers:

docker-compose up

Control specific container:

docker-compose start/stop/restart [container name]

List containers:

docker-compose ps

Open Rails console:

docker-compose run app rails console

Apt Packages

• For postgres:

  • build-essential
  • libpq-dev
  • postgresql-client

• For nokogiri:

  • libxml2-dev
  • libxslt1-dev

• For a JS runtime:

  • nodejs

• For capybara-webkit:

  • libqt4-webkit
  • libqt4-dev xvfb

Misc

(via nickjanetakis.com)

Remove dangling Docker images:

docker rmi -f $(docker images -qf dangling=true)

Remove dangling Docker volumes:

docker volume rm $(docker volume ls -qf dangling=true)