How to:

New App

1. clone this repository
2. cd into created directory
3. run docker-compose build
4. create a new rails app in the directory with:

docker-compose run --no-deps app rails new . -d postgresql 

5. Edit config/database.yml and set up the host and username:

...
default: &default
  adapter: postgresql
  encoding: unicode
  # For details on connection pooling, see Rails configuration guide
  # http://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  host: db
  username: postgres
...

6. Generate the databases with docker-compose run app bundle exec rails db:create
7. Start the app with docker-compose up
8. Nagivate to http://localhost on your browser. You should see the rails welcome page.

Existing App

1. Copy the Dockerfile, docker-compose.yml and entrypoint.sh files into the root of your app.
2. Build the image with docker-compose build
3. Follow from step 5 above