스웜

# Swarm 클러스터 초기화 및 관리
docker swarm init --advertise-addr 192.168.1.10
docker swarm join-token worker          # Worker 조인 토큰 확인
docker swarm join-token manager         # Manager 조인 토큰 확인

# 노드 관리
docker node ls                          # 노드 목록
docker node promote worker-1            # Worker를 Manager로 승격
docker node update --availability drain manager-2  # 유지보수 모드

# docker-compose.yml (Stack 배포용)
version: '3.8'
services:
  web:
    image: nginx:alpine
    deploy:
      replicas: 3
      update_config:
        parallelism: 1
        delay: 10s
        failure_action: rollback
      rollback_config:
        parallelism: 1
      restart_policy:
        condition: on-failure
        max_attempts: 3
      resources:
        limits:
          cpus: '0.5'
          memory: 256M
    ports:
      - "80:80"
    networks:
      - webnet

  api:
    image: myapp/api:latest
    deploy:
      replicas: 2
      placement:
        constraints:
          - node.role == worker
    secrets:
      - db_password
    networks:
      - webnet

networks:
  webnet:
    driver: overlay

secrets:
  db_password:
    external: true

# Stack 배포 및 관리
docker stack deploy -c docker-compose.yml myapp
docker stack services myapp             # 서비스 목록
docker service scale myapp_web=5        # 스케일 조정
docker service logs myapp_api -f        # 로그 확인