Docker and docker-compose configuration for rails and mysql

README.md

Docker

Installation

• Docker for Windows: https://docs.docker.com/docker-for-windows/install/#install-docker-for-windows
• Docker for Ubuntu: sudo apt install docker.io
• Docker-compose: https://docs.docker.com/compose/install/#install-compose

Use docker on your own rails project

Create the files (Dockerfile, docker-compose.yml and Makefile) in the rails root folder and run commands:

make build # only first time
make up

Usage

# Build the docker image
make build

# Start the containers
make up # To stop use Ctrl + C

# Stop the containers if something wrong have happen on Ctrl + C
make stop

# Running bundle
make bundle

# Running db:migrate
make migrate

# Accessing the container
make bash # To stop use exit

database.yml

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 15
  host: db
  username: user
  password: password

development:
  <<: *default
  

docker-compose.yml

version: '3.4'
services:
  db:
    container_name: db
    image: library/mysql:5.6.22
    ports:
      - 3306:3306
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=development
      - MYSQL_USER=user
      - MYSQL_PASSWORD=password
  
  app:
    container_name: app
    image: myapp
    user: $USER
    volumes:
      - bundle:/usr/local/bundle
      - ${PWD}:${APP_PATH}/app
    tty: true
    ports:
      - 3000:3000
    links:
      - db
    command: rails s -b 0.0.0.0

volumes:
  bundle:
    name: bundle

Dockerfile

# From one of the official ruby images
FROM ruby:2.4.3

LABEL [email protected]

# Using same user name and id is important to keep same permission between container and local machine
ARG USER
ARG UID
ARG RAILS_ENV
ARG APP_PATH=/var/www

RUN echo "RUN env=$RAILS_ENV UID=$UID USER=$USER"

RUN addgroup --gid $UID $USER && \
  adduser --system --gid $UID --uid $UID $USER && \
  mkdir -p ${APP_PATH} && \
  chown -R $USER:$USER $APP_PATH /usr/local/bundle

RUN chown -R $USER:$USER $APP_PATH

RUN curl -sS http://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb http://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-get update
RUN apt-get -y install node yarn

USER $USER
WORKDIR ${APP_PATH}/app

CMD bash

Makefile

build:
	docker build -t myapp . --build-arg USER=$$USER --build-arg UID=$$(id -u) --no-cache

up:
	docker-compose up

stop: 
	docker-compose stop

bundle:
	docker-compose exec app bundle install -j 10 || docker-compose run app bundle install -j 10

migrate:
	docker-compose exec app rails db:migrate || docker-compose run app rails db:migrate

bash: 
	docker-compose exec app bash -c "stty cols 200 && bash" || docker-compose run app bash -c "stty cols 200 && bash"