Docker: Ruby + Rails + Postgres + Elasticsearch + Redis + Sidekiq + Mailcatcher

docker-compose.yml

version: "3"

services:
  postgres:
    image: "postgres:11.4-alpine"
    restart: always
    ports:
      - '5432:5432'
    volumes:
      - postgres:/var/lib/postgresql/data
    networks:
      - backend

  sidekiq:
    build: .
    restart: always
    command: bundle exec sidekiq
    networks:
      - backend

  redis:
    image: redis:5.0.5-alpine
    restart: always
    command: redis-server
    ports:
      - '6379:6379'
    volumes:
      - redis:/var/lib/redis/data
    networks:
      - backend

  elasticsearch:
    image: elasticsearch:7.3.0
    restart: always
    ports:
      - "9200:9200"
    volumes:
      - elasticsearch:/usr/share/elasticsearch/data
    networks:
      - backend

  mailcatcher:
    image: yappabe/mailcatcher
    ports:
      - "1025:1025"
      - "1080:1080"
    networks:
      - backend

  app:
    build: .
    restart: always
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    ports:
      - "3000:3000"
    volumes:
      - .:/my-app
    networks:
      - backend

volumes:
  postgres:
  redis:
  elasticsearch:

networks:
  backend:
    driver: "bridge"

Dockerfile

FROM ruby:2.6.3-slim

RUN apt-get update && apt-get install -qq -y --no-install-recommends build-essential libpq-dev libsqlite3-dev curl imagemagick nodejs

RUN	groupadd -r -g 1000 docker && \
		useradd -r --create-home -u 1000 -g docker docker

WORKDIR /my-app

COPY Gemfile /my-app/Gemfile
COPY Gemfile.lock /my-app/Gemfile.lock

RUN chown -R docker:docker /my-app && \
chmod g+w /my-app/Gemfile.lock

COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

USER docker

RUN gem install mailcatcher && \
		bundle install

COPY . /my-app

CMD ["rails", "server", "-b", "0.0.0.0"]

entrypoint.sh

#!/bin/bash

set -e

rm -f /my-app/tmp/pids/server.pid
exec "$@"

Gemfile

source 'https://rubygems.org'
gem 'rails', '~> 5.2', '>= 5.2.3'

notes.md

Need to create blank Gemfile.lock file

Official Documentation

• Docker

DockerHub

• Ruby
• Postgres
• Redis
• Elasticsearch
• Mailcatcher