What are some examples of Docker Compose files?

What are some examples of Docker Compose files?

Docker Compose files are used to define and run multi-container Docker applications. Here are a few examples:

1. Basic Web App:

   version: '3'
   services:
     web:
       image: nginx
       ports:
         - "80:80"
   

2. Web App with Database:

   version: '3'
   services:
     web:
       image: nginx
       ports:
         - "80:80"
     db:
       image: postgres
       environment:
         POSTGRES_PASSWORD: example
   

3. Multi-Service App:

   version: '3'
   services:
     web:
       build: .
       ports:
         - "5000:5000"
     redis:
       image: "redis:alpine"
   

Would you like to see more complex examples or specific use cases?

Can you show me a more complex example?

Sure! Here's a more complex example that includes a web application, a database, and a caching service:

version: '3.8'
services:
  web:
    build: ./app
    ports:
      - "5000:5000"
    depends_on:
      - db
      - redis
  db:
    image: postgres:latest
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password
      POSTGRES_DB: mydb
  redis:
    image: redis:alpine
  nginx:
    image: nginx:latest
    ports:
      - "80:80"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf

This setup includes a web service, a PostgreSQL database, a Redis cache, and an Nginx reverse proxy.

What is the purpose of the 'depends_on' option?

The 'depends_on' option in Docker Compose specifies the order in which services should be started. It ensures that the services listed will start before the service that depends on them. However, it does not wait for the dependent services to be 'ready' before starting the dependent service.