Docker to run ruby

commands.sh

# set up
docker-compose run web rails new . --force --database=postgresql --skip-bundle

# db
docker-compose run web rails db:create && rails db:migrate

# if you have any issues with gems and any time
# you change your Gemfile or Dockerfile, run
docker-compose build

# running the app
docker-compose up -d

# show the files
ls -l

# if on linux
sudo chown -R $USER:$USER .

# config for database
username: postgres
password:
host: db

docker-compose.yml

version: '2'
services:
  db:
    image: postgres
  web:
    build: .
    command: bundle exec rails -p 3000 -b '0.0.0.0'
    volumes:
      - .:/app
    ports:
      - "3000:3000"
    depends_on:
      - db

Dockerfile

FROM ruby:2.3.3

RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
RUN mkdir /app # app name

WORKDIR /app

ADD Gemfile /app/Gemfile
ADD Gemfile.lock /app/Gemfile.lock

RUN bundle install

ADD . /app