Rails development using docker

Local setup

• Requirements

  • Virtualbox >=4.2
  • Vagrant >=1.6

• Download host OS image for docker host OS.

% vagrant box add precise64 http://files.vagrantup.com/precise64.box

• Build Docker images and run containers.
  • This would take 30 minutes.
  • Password of your host OS is required to mount current directory by NFS.

% vagrant up

• Then access to http://localhost:3000/cars

Usage

• d command is utility for rails development.

Usage : ./d command
Commands:
rc - Rails Console
rdbm - Migrate Database
restore-db - Restoring drop db, migrate and put seed
restart - Restart rails app after bundling gems
rebuild - Rebuild the docker container with latest Gemfile and restart
cmd "bundle exec something" - Run the command in quotes in /app

• To execute rspec

% ./d cmd bundle exec rspec

• To execute bundle install

% ./d restart

• To stop host machine, shutdown the Docker host OS on Virtualbox.

% vagrant halt

• Just want to get a rails server instance.

$ docker run -it -v /app:/app --link redis:redis --link mysql:db rails:latest /bin/bash

• To acquire console of rails server
  • To exit the console, Ctrl + Z or Ctrl + C

$ docker attach --sig-proxy=false rails

Rebuild

• Rebuild from VirtualBox VM
• This takes 30 minutes.

% vagrant destroy && vagrant up

• Rebuild docker images by referring Dockerfile.
  • This uses docker image cache.
  • bundle install will be ran.
  • This takes 5 minutes.

% vagrant provision

Issues

• MySQL's permission for docker allows connection from anywhere.
  • I'd like to restrict MySQL incoming connection from rails server and host computer.

Expressions

• % indicates prompt of host computer.
• $ indicates prompt of VirtualMachine(=docker host) on vagrant.
• # indicates prompt of Docker container.