Dockerize project

Dockerfile

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+FROM ruby:3.1.2
+RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
+
+RUN mkdir /myapp
+WORKDIR /myapp
+COPY Gemfile /myapp/Gemfile
+COPY Gemfile.lock /myapp/Gemfile.lock
+RUN bundle install
+EXPOSE 3000
+CMD ["rails", "server", "-b", "0.0.0.0"]

config/database.yml

@@ -1,86 +1,20 @@
-# PostgreSQL. Versions 9.3 and up are supported.
-#
-# Install the pg driver:
-#   gem install pg
-# On macOS with Homebrew:
-#   gem install pg -- --with-pg-config=/usr/local/bin/pg_config
-# On macOS with MacPorts:
-#   gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
-# On Windows:
-#   gem install pg
-#       Choose the win32 build.
-#       Install PostgreSQL and put its /bin directory on your path.
-#
-# Configure Using Gemfile
-# gem "pg"
-#
 default: &default
   adapter: postgresql
   encoding: unicode
-  # For details on connection pooling, see Rails configuration guide
-  # https://guides.rubyonrails.org/configuring.html#database-pooling
+  host: db
+  username: postgres
+  password: supersecretpass
+
   pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
 
 development:
   <<: *default
   database: blog_api_development
 
-  # The specified database role being used to connect to postgres.
-  # To create additional roles in postgres see `$ createuser --help`.
-  # When left blank, postgres will use the default role. This is
-  # the same name as the operating system user running Rails.
-  #username: blog_api
-
-  # The password associated with the postgres role (username).
-  #password:
-
-  # Connect on a TCP socket. Omitted by default since the client uses a
-  # domain socket that doesn't need configuration. Windows does not have
-  # domain sockets, so uncomment these lines.
-  #host: localhost
-
-  # The TCP port the server listens on. Defaults to 5432.
-  # If your server runs on a different port number, change accordingly.
-  #port: 5432
-
-  # Schema search path. The server defaults to $user,public
-  #schema_search_path: myapp,sharedapp,public
-
-  # Minimum log levels, in increasing order:
-  #   debug5, debug4, debug3, debug2, debug1,
-  #   log, notice, warning, error, fatal, and panic
-  # Defaults to warning.
-  #min_messages: notice
-
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
 test:
   <<: *default
   database: blog_api_test
 
-# As with config/credentials.yml, you never want to store sensitive information,
-# like your database password, in your source code. If your source code is
-# ever seen by anyone, they now have access to your database.
-#
-# Instead, provide the password or a full connection URL as an environment
-# variable when you boot the app. For example:
-#
-#   DATABASE_URL="postgres://myuser:mypass@localhost/somedatabase"
-#
-# If the connection URL is provided in the special DATABASE_URL environment
-# variable, Rails will automatically merge its configuration values on top of
-# the values provided in this file. Alternatively, you can specify a connection
-# URL environment variable explicitly:
-#
-#   production:
-#     url: <%= ENV["MY_APP_DATABASE_URL"] %>
-#
-# Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
-# for a full overview on how database connection configuration can be specified.
-#
 production:
   <<: *default
   database: blog_api_production
-  username: blog_api
-  password: <%= ENV["BLOG_API_DATABASE_PASSWORD"] %>

docker-compose.yml

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+version: '3'
+services:
+  db:
+    image: postgres
+    restart: always
+    environment:
+      POSTGRES_PASSWORD: supersecretpass
+    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