spring:
    application:
        name: eureka-server

server:
    port: 8761 #启动端口

eureka:
    instance:
        hostname: eureka-server
        instance-id: ${spring.cloud.client.ipAddress}:${server.port}
        prefer-ip-address: true
    client:
        registerWithEureka: false  #false:不作为一个客户端注册到注册中心
        fetchRegistry: false      #为true时，可以启动，但报异常：Cannot execute request on any known server
        service-url:
          defaultZone: http://${EUREKA_HOST:localhost}:${server.port}/eureka/
    server:
        enable-self-preservation: false #关闭保护机制，确保注册中心可以将不可用的实例正确剔除
        eviction-interval-timer-in-ms: 3000
        response-cache-update-interval-ms: 2000

Eureka配置的端口是8761，一直启动正常，突然启动不正常了，启动端口口变成8780，导致其他服务注册Eureka失败

 原因：IDEA没有编译yml文件，解决办法：对Eureka项目重新install即可