[RUBY] Easy to display hello world with Rails + Docker

I feel like I'm checking it every time I create an app, so I've summarized it as a memorandum. Please enter the app name in the app name section below.

Create a new directory ~ hello world !!

First, create a directory that will be the base of your app. In addition, use the touch command to create two empty files.

$mkdir app name&&cd app name
$ touch Gemfile Gemfile.lock

Because I'm developing using VScode It is started using the code command. By the way, the code command will start and create for you.

Edit the Gemfile.

$ code Gemfile


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

Create and edit a Dockerfile.

$ code Dockerfile


FROM ruby:2.5
RUN apt-get update
RUN apt-get install -y \ 
    build-essential \
    libpq-dev \
    nodejs \
    postgresql-client \
    yarn \

WORKDIR /app name
COPY Gemfile Gemfile.lock /app name/
RUN bundle install

Create and edit the docker-compose.yml file.

$ code docker-compose.yml


version: "3"


    build: .
      - "3000:3000"
      - ".:/app name"
      - "DATABASE_PASSWORD=postgres"
    tty: true
    stdin_open: true
      - db
      - db

    image: postgres
      - "db-data:/var/lib/postgresql/data"
      - "POSTGRES_USER=postgres"
      - "POSTGRES_PASSWORD=postgres"

Start the container, enter the web container, and rails new.

$ docker-compose up --build -d
$ docker-compose exec web bash
$ rails new . --force --database=postgresql

Add to the database.yml file created by rails new.


default: &default
  adapter: postgresql
  encoding: unicode
  host: db  #Postscript
  user: postgres  #Postscript
  port: 5432  #Postscript
  password: <%= ENV.fetch("DATABASE_PASSWORD") %>  #Postscript
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
$ rails db:migrate
$ rails s -b

If you access Chrome's search bar by typing localhost: 3000, you'll see hello world!

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