Compose file - Advance

anchor & Alias

https://docs.docker.com/compose/compose-file/11-extension/

• Anchor & Alias를 이용하여 반복적으로 사용되는 요소들을 모듈화
• 방법
  • &”명칭” 으로 요소를 지정, <<: *”명칭” 으로 가져다 사용
• 예시

  • 모듈화

    version: '3.8'
    
    x-common:
    	&common
    	restart: always
    	volumes:
    		- source:/code
    	environment:
    		&default-env
    		BY: "x-common"
    	
    x-value: &v1 x
    
    services:
    	ubuntu:
    		<<: *common
    		image: ubuntu:22.04
    		environment:
    			<<: *default-env
    			FROM: "env definition"
    			X: *v1
    		entrypoint: /bin/bash
    		command:
    			- -c
    			- echo 'env from ${FROM}' && echo env from $${BY}
    		restart: no
    
    volumes:
    	source:
    	
    
    설명
    ----
    &common
    ==
    restart: always
    volumes:
      - source:/code
    
    &default-env
    ==
    BY: "x-common"
    
    &v1
    ==
    x
    

    • 모듈화 안한 경우

    version: '3.8'
    
    services:
      ubuntu:
        image: ubuntu:22.04
        restart: always
        volumes:
          - source:/code
        environment:
          BY: "x-common"
          FROM: "env definition"
          X: x
        entrypoint: /bin/bash
        command:
          - -c
          - echo 'env from ${FROM}' && echo env from $${BY}
        restart: no
    
    volumes:
      source:
    
    

profile

https://docs.docker.com/compose/profiles/

https://docs.docker.com/compose/compose-file/15-profiles/

• 예제

  1. yaml 파일 작성
  --------------
  version: '3.8'
  services:
  	postgres:
  		image: postgres:16.1-bullseye
  		environment:
  		- POSTGRES_PASSWORD=mysecretpassword
  	
  	server:
  		image: ubuntu:22.04
  		stdin_open: true # docker run -i
  		tty: true # docker run -t
  		depends_on:
  			- postgres
  	
  	pgadmin:
  		image: dpage/pgadmin4:7.4
  		environment:
  			- [email protected]
  			- PGADMIN_DEFAULT_PASSWORD=SuperSecret
  		depends_on:
  			- postgres
  			- server
  		profiles:
  			- debug
  			
  2. 프로젝트 실행, profile 선언 x
  -------------------------------
  docker compose -f docker-compose.yaml up -d
  => postgres, server 2개의 서비스만 실행
  
  3. 프로젝트 실행, profile 선언 o
  -------------------------------
  docker compose -f docker-compose.yaml --profile debug up -d
  => postrgres, server ,pgadmin 3개의 서비스 실행
  
  

deploy

https://docs.docker.com/compose/compose-file/deploy/

• 예제

  deploy:
  	resources:
  		limits: ------- 한계치
  			cpus: '0.50'
  			memory: 50M
  			pids: 1
  		reservations: ----- 사용할 예약 공간
  			cpus: '0.25'
  			memory: 20M
  	restart_policy:
  		condition: on-failure
  		delay: 5s
  		max_attempts: 3
  		window: 120s ----- 120초안에 3번의 시도가 있었는지
  	update_config:
  		parallelism: 2
  		delay: 10s
  		order: stop-first
  

• 예제2

  name: deploy-replica
  services:
  	web:
  		image: nginx:latest
  		expose:
  			- 80
  		deploy:
  			replicas: 3
  

depend_on

https://docs.docker.com/compose/startup-order/