Docker Config Rails with MySql

For generating Rails skeleton, run

docker-compose run web rails new . --force --database=mysql --skip-bundle

For using Docker in linux, the generated files are owned by root, to change to access rights to current user, run

sudo chown -R $USER:$USER .

For building the Docker Image, run

docker-compose build

whenever any configuration file is changed, you need to build the image

After building the image, you need to update the config/database.yml with the following

  default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: "root"
  host: db

  development:
  <<: *default
  database: dev

  test:
  <<: *default
  database: dev

  production:
  <<: *default
  database: dev
  username: testing_app
  password: <%= ENV['TESTING_APP_DATABASE_PASSWORD'] %>

To boot up the app, run

docker-compose up

keep the terminal running, in a seperate terminal run the following command to create the database,

docker-compose run web rails db:create

In your browser, open localhost:3000 , you will see the rails welcome screen now!