Create Rails5 and postgresql environment with Docker and make pgadmin available

I've only used mysql with docker and it took a long time, so I wrote it so that I can see it later. I also included pgadmin because it is convenient.

docoker-docker so you don't have to rails s after compose up-compose.I wrote in yml so that it will be done automatically with command.

 I don't usually need to recreate the container, so I'm assuming that I will do it with `` `docker-compose start / stop```.

#### **`Dockerfile`**

FROM ruby:2.6

RUN apt-get update -y && \
    apt-get install  -y nodejs

COPY Gemfile /Gemfile
COPY Gemfile.lock /Gemfile.lock
RUN gem install bundler
RUN bundle install


version: "3"
    image: postgres
      - 5432:5432
      POSTGRES_USER: root
      - "./postgres-data:/var/lib/postgresql/data"
    image: dpage/pgadmin4:4.2
      - 80:80
      - ./docker/pgadmin4:/var/lib/pgadmin
      - db
    build: .
      - ".:/app"
      - "3000:3000"
    tty: true
      - db
    working_dir: "/app"
    command: "rails s -b"

mysql and database.yml are different, and I was addicted to writing something like develop here. I had to write it properly in default.


default: &default
  adapter: postgresql
  encoding: unicode
  # For details on connection pooling, see Rails configuration guide
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  #Here and there
  username: root
  password: root
  host: db

Reference site Persistence of connection server settings of pgadmin4 / docker -Qiita

Write the Dockerfile and docker \ -compose \ .yml for rails5 -Qiita

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