eureka注册报错Cannot execute request on any known server

springcloud的应用向eureka注册中心注册失败，报错如下：com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

解决方法：

先确定注册中心是否已经启动，如果注册中心已启动，并可以访问，那就注意再要注册的应用中添加下面红色的代码。

1.注册中心配置
server:
  port: 18081                    # 指定该Eureka实例的端口
eureka:
  instance:
    hostname: localhost         # 指定该Eureka实例的主机名
client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

2.要注册的应用配置
application:
  name: all-in-one    # 项目名称尽量用小写
eureka:
    client:
         register-with-eureka: true
         fetch-registry: true
         serviceUrl:
           defaultZone: http://localhost:18081/eureka/    # 指定注册中心的地址
     instance:
        preferIpAddress: true
ribbon:
  eureka:
    enabled: false

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