Dockernize your rails app easiest way

add Dockerfile

add this Dockerfile to your rails app root

FROM kikyous/docker-nginx-puma
MAINTAINER someone <someone@gmail.com>

build image

docker build -t someone/my-app .

push to docker hub

docker push someone/my-app

run it anywhere

docker run -i -p 80:80 --name="myapp" someone/my-app

what's in it

• ruby 2.3
• nginx
• puma

best practice

• you have to add gem 'puma' to your Gemfile.
• you can use your own config/puma.rb, but these line is needed.

environment 'production'
bind "unix:///tmp/puma.sock"

• you can use your own Procfile, but these line is needed.

web: bundle exec puma -C config/puma.rb
nginx: nginx -c /etc/nginx/nginx.conf

• use env to set database, for example:

production:
  adapter: mysql2
  host: <%= ENV['MYSQL_PORT_3306_TCP_ADDR'] %>
  database: <%= ENV['MYSQL_INSTANCE_NAME'] %>
  username: <%= ENV['MYSQL_USERNAME'] %>
  password: <%= ENV['MYSQL_PASSWORD'] %>