kohheepeace/rails6-docker-starter

Rails 6 Docker starter

Step1

mkdir rails6-docker-starter
cd rails6-docker-starter
touch Dockerfile

From rails webpacker guide... https://github.com/rails/webpacker/blob/master/docs/docker.md

Dockerfile

FROM ruby:2.6

RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
    && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list

RUN apt-get update -qq && apt-get install -y nodejs postgresql-client yarn
RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

# 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", "-b", "0.0.0.0"]

Step2

Make Gemfile

Gemfile

source 'https://rubygems.org'
gem 'rails', '~> 6.0.0'

Step3

Make Gemfile.locK

Step4

Make entrypoint.sh

#!/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 "$@"

Step5

Official docs guide and Rails webpacker docker example.

https://github.com/rails/webpacker/blob/master/docs/docker.md

docker-compose.yml

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
  webpacker:
    build: .
    env_file:
      - '.env.docker'
    command: ./bin/webpack-dev-server
    volumes:
      - .:/myapp
    ports:
      - '3035:3035'

config/webpacker.yml

development:
  <<: *default
  compile: true

  # Verifies that correct packages and versions are installed by inspecting package.json, yarn.lock, and node_modules
  check_yarn_integrity: true

  # Reference: https://webpack.js.org/configuration/dev-server/
  dev_server:
    https: false
    host: webpacker
    port: 3035
    public: localhost:3035
    hmr: false
    # Inline should be set to true if using HMR
    inline: true
    overlay: true
    compress: true
    disable_host_check: true
    use_local_ip: false
    quiet: false
    headers:
      'Access-Control-Allow-Origin': '*'
    watch_options:
      ignored: '**/node_modules/**'

env.docker

NODE_ENV=development
RAILS_ENV=development
WEBPACKER_DEV_SERVER_HOST=0.0.0.0

Step6

terminal

docker-compose run web rails new . --force --no-deps --database=postgresql

Step7

terminal

docker-compose build

Step8

config/database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: postgres
  password:
  pool: 5

development:
  <<: *default
  database: myapp_development


test:
  <<: *default
  database: myapp_test

Step9

terminal

docker-compose run web rake db:create

Step 10

docker-compose up

And

visit

http://localhost:3000/

Step 11

For database admin like pg_admin, postico... https://hub.docker.com/_/postgres

version: '3'
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
    restart: always
    environment:
      POSTGRES_PASSWORD: example
  adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080
  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
  webpacker:
    build: .
    env_file:
      - '.env.docker'
    command: ./bin/webpack-dev-server
    volumes:
      - .:/myapp
    ports:
      - '3035:3035'

database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: postgres
  password: example
  pool: 5

development:
  <<: *default
  database: myapp_development

test:
  <<: *default
  database: myapp_test

Refs

https://docs.docker.com/compose/rails/