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docker-compose — Структура файла конфигурации

Фрагмент из «docker-compose»: Структура файла конфигурации.

yaml infra-securityencyclopedia8-06-konteynerizatsiya-i-orkestratsiya-1111 embed URL статья в энциклопедии
YAML main.yaml 
version: '3.8'

services:
  web:
    image: nginx:alpine
    ports:
      - "80:80"
    volumes:
      - ./html:/usr/share/nginx/html
  
  db:
    image: postgres:15
    environment:
      POSTGRES_USER: admin
      POSTGRES_PASSWORD: secret
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  pgdata:
version: '3.8'

services:
  web:
    image: nginx:alpine
    ports:
      - "80:80"
    volumes:
      - ./html:/usr/share/nginx/html
  
  db:
    image: postgres:15
    environment:
      POSTGRES_USER: admin
      POSTGRES_PASSWORD: secret
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  pgdata: