Dockerize your rails app

Docker

An open platform for distributed applications for developers and sysadmins.

www.docker.com

• Build (linux) Images
• Run Containers from Images
• Decouple apps components (MySQL, Rails, Redis) into containers
• Docker deamon orchestrates and exposes container ports to outside

Docker Compose

... a tool for defining and running complex applications with Docker.

http://docs.docker.com/compose/

• Dockerfile (s) define images
• docker-compose.yml composes images (your app)
• docker-compose up starts app (your sandbox)

Dockerizing Rails

• Build a minimal Image

      i.e. just Rails + Passenger with port 80 exposed

         https://source.xing.com/jorge-dias/elpis

FROM xing-base-rails-web:latest

• Image with your gems minimal needed libraries

Dockerizing Rails

• Determine your Rails app components (containers)

        e.g. jobs: MySQL, Redis, Memcached, RabbitMQ

        check Docker Images Hub for more

<environment>:  
  database: <%= ENV['DB_DATABASE'] %>
  username: <%= ENV['DB_USER'] %>
  password: <%= ENV['DB_PASSWORD'] %>
  host: <%= ENV['DB_HOST'] %>
  port: <%= ENV['DB_PORT'] %>

• Configure Rails through Environment Variables 

      config/database.yml, AppConfig, etc

Status of jobs app

Already sailing on docker :-)

  TODO

• Click around
• Find Problems
• 100% Decouple gems + app from components and server 

Dockerize XING Sandboxes

https://source.xing.com/jorge-dias/elpis

Team

Jean Carlos Meninno

Jorge Dias

Joaquin Rivera Padron