Skip to main content

Example of a dockerCompose YAML

Here's an example of a Docker compose yaml file.

version: '3.9'
services:
  frontend:
    image: nginx
    ports:
      - "80:80"
    depends\_on:
      - backend
  backend:
    build:
      context: ./backend
    ports:
      - "5000:5000"
    depends\_on:
      - database
  database:
    image: postgres
    environment:
      POSTGRES\_USER: myuser
      POSTGRES\_PASSWORD: mypassword
      POSTGRES\_DB: mydatabase

As you can see, there are three services

  1. Frontend

  2. Backend

  3. Database

The order in which it starts is based on the dependencies.

Frontend Depends on Backend

Backend Depends on Database

Hence the order: Database -> Backend -> Frontend

The three services will start and boom, that's it. The commands are in the next slide.