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docker-compose Rails and Postgresql


  1. Dockerfile
    1. FROM ruby:2.6.3
      RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
      RUN mkdir /myapp
      WORKDIR /myapp
      COPY . /myapp
      RUN gem update --system
      RUN bundle install
      RUN yarn install --check-files
      
      # Add a script to be executed every time the container starts.
      COPY entrypoint.sh /usr/bin/
      RUN chmod +x /usr/bin/entrypoint.sh
      ENTRYPOINT ["entrypoint.sh"]
      EXPOSE 3000
      
      # Start the main process.
      CMD ["rails", "server", "-e", "production", "-b", "0.0.0.0"]
      # Production
      # CMD ["rails", "server", "-b", "0.0.0.0"]
      
  2. entrypoint.sh
    1. #!/bin/bash
      set -e
      
      # Remove a potentially pre-existing server.pid for Rails.
      rm -f /myapp/tmp/pids/server.pid
      
      # Then exec the container's main process (what's set as CMD in the Dockerfile).
      exec "$@"
  3. docker-compose.yml
    1. version: '3'
      services:
        db:
          image: postgres
          volumes:
            - ./tmp/db:/var/lib/postgresql/data
        web:
          build: .
          command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
          volumes:
            - .:/myapp
          ports:
            - "3000:3000"
          depends_on:
            - db
  4. database.yml
    1. default: &default
        adapter: postgresql
        encoding: unicode
        host: db
        username: postgres
        password:
        pool: 5
      
      development:
        <<: *default
        database: myapp_development
      
      
      test:
        <<: *default
        database: myapp_test
  5. build & run
    1. docker-compose build
      docker-compose up
      docker-compose run web rake db:create
      docker-compose run web rake db:migrate #or docker-compose run web rake db:create db:migrate
    2. $ docker-compose up
      Creating network "blog_default" with the default driver
      Creating blog_db_1 ... done
      Creating blog_web_1 ... done
      Attaching to blog_db_1, blog_web_1
      db_1   | 2019-06-28 03:09:42.063 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
      db_1   | 2019-06-28 03:09:42.063 UTC [1] LOG:  listening on IPv6 address "::", port 5432
      db_1   | 2019-06-28 03:09:42.113 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
      db_1   | 2019-06-28 03:09:42.210 UTC [24] LOG:  database system was shut down at 2019-06-28 03:09:21 UTC
      db_1   | 2019-06-28 03:09:42.242 UTC [1] LOG:  database system is ready to accept connections
      web_1  | WARNING: Use strings for Figaro configuration. 305150117040730 was converted to "305150117040730".
      web_1  | => Booting Puma
      web_1  | => Rails 6.0.0.rc1 application starting in development 
      web_1  | => Run `rails server --help` for more startup options
      web_1  | Puma starting in single mode...
      web_1  | * Version 3.12.1 (ruby 2.6.1-p33), codename: Llamas in Pajamas
      web_1  | * Min threads: 5, max threads: 5
      web_1  | * Environment: development
      web_1  | * Listening on tcp://0.0.0.0:3000
      web_1  | Use Ctrl-C to stop
    3. $ docker-compose down
      Stopping blog_db_1 ... done
      Removing blog_web_run_1 ... done
      Removing blog_db_1      ... done
      Removing network blog_default
  6. docker-compose test
    1. docker-compose run -e "RAILS_ENV=test" app rake test

#postgresql (3) #docker-compose (7) #docker (20) #rails (32)
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