Spring Cloud 疑难杂症(1): Eureka docker swarm下的高可用

# bootstrap.yml
spring:
  application:
    name: eureka-server
  cloud:
    inetutils:
     # 限制在docker容器中使用的ip端防止容器绑定到不同ip端，导致容器间无法连接
      preferred-networks: 10.10.0
      timeout-seconds: 2
      default-hostname: ${EUREKA_HOST_NAME:eureka-server}

# application.yml
eureka:
    instance:
        instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
        # 集群下使用要通过IP进行通信
        prefer-ip-address: true
        hostname: ${EUREKA_HOST_NAME}
    client:
        register-with-eureka: true
        fetch-registry: true
        service-url:
            # 有多少个节点都要加进去
            defaultZone: http://${EUREKA_ZONE_HOST1:127.0.0.1}:${EUREKA_ZONE_PORT1:8761}/eureka/,http://${EUREKA_ZONE_HOST:127.0.0.1}:${EUREKA_ZONE_PORT:8761}/eureka/

version: '3.6'
services:
  eureka-server:
    image: eureka
    container_name: sc-eureka
    restart: always
    deploy:
      mode: replicated
      replicas: 1
      resources:
        limits:
          memory: 1g
          cpus: "0.5"
      update_config:
        parallelism: 1 # 每次更新复本数量
        delay: 2s # 每次更新间隔
        order: start-first # 更新顺序为新任务启动优先
      restart_policy:
        condition: on-failure
     # 多节点部署在不同docker 节点服务器上
      placement:
        constraints: [node.role == manager]
    volumes:
      - /var/log/xyj:/var/log
    environment:
      - SPRING_PROFILES_ACTIVE=${SPRING_PROFILES_ACTIVE}
      - EUREKA_HOST_NAME=eureka-server
      - EUREKA_SERVER_PORT=8761
      - EUREKA_ZONE_HOST=eureka-server
      - EUREKA_ZONE_PORT=8761
      - EUREKA_ZONE_HOST1=eureka-server1
      - EUREKA_ZONE_PORT1=8762
    networks:
      docker_net-es:
        aliases:
          - eureka
    ports:
      - 8761:8761

  eureka-server1:
    image: eureka
    container_name: sc-eureka
    restart: always
    deploy:
      mode: replicated
      replicas: 1
      resources:
        limits:
          memory: 1g
          cpus: "0.5"
      update_config:
        parallelism: 1 # 每次更新复本数量
        delay: 2s # 每次更新间隔
        order: start-first # 更新顺序为新任务启动优先
      restart_policy:
        condition: on-failure
      placement:
        constraints: [node.role == worker]
    volumes:
      - /var/log/xyj:/var/log
    environment:
      - SPRING_PROFILES_ACTIVE=${SPRING_PROFILES_ACTIVE}
      - EUREKA_HOST_NAME=eureka-server1
      - EUREKA_SERVER_PORT=8762
      - EUREKA_ZONE_HOST=eureka-server1
      - EUREKA_ZONE_PORT=8762
      - EUREKA_ZONE_HOST1=eureka-server
      - EUREKA_ZONE_PORT1=8761
    networks:
      docker_net-es:
        aliases:
          - eureka
    ports:
      - 8762:8762
networks:
  docker_net-es:
    external: true