docker swarm 过滤器affinity 限制副本不会出现在同一个节点上

      affinity:container!=容器服务名称（可以是正则）

举个例子：stack_ds.yaml

# cat stack_dsc.yaml 
version: '3.0'
services:
   test:
    image: xxxxxxxxx
    logging:
      driver: "json-file"
      options:
        max-size: "50m"
        max-file: "10"
    environment:
      - MYSQL_HOST=192.168.
      - MYSQL_DATABASE=dsc
      - MYSQL_USERNAME=u_dsc
      - MYSQL_PORT=3306
      - MYSQL_PASSWORD=xxxx
      - "affinity:container!=test"
    deploy:
      mode: replicated
      replicas: 3
      restart_policy:
        condition: on-failure
      resources:
        limits:
          memory: 1048m
    networks:
      - basenet
networks:
  basenet:
    external: true

"affinity:container!=test"
节点上若有test的容器，则不在该节点启动。
若节点小于3，则忽略上一条规则