【springcloud】服务启动后正常，但是⽆法上线，⼀直处于down状态
springcloud和springboot
spring cloud eureka 如果出现某个应⽤实例 down(1),
说明 spring admin 健康检测没有通过导致 eureka 注册中⼼不会把这个实例从列表中删除掉。这样所有使⽤这个实例的服务都会现404（前提是在应⽤中配置过spring admin）；
2：spring admin 健康检测会检测*.properties⾥的所有连能性的配置(mysql,redis，短信服务，邮件服务)，如果这些URL中有⼀个不通，则会导致eureka中出现，这个实例down(1) 并且不会从列表中删除掉。
例：应⽤中不使⽤reides，但是在l中引⽤reides的配置（只限于spring-boot redis配置）这样spring admin 健康检测发现*.properties没配置redis，但是spring-boot-starter-data-redis 有默认配置(是localhost), 会导致检测不通过，eureka 显⽰状态为 down(1).
处理这样问题可以使⽤：eureakIP:port/health 如果没有问题会返回：
{"description":"Spring Cloud Eureka Discovery Client","status":"UP"} 如果有问题会返回那个实例的检测什么配置项没有通过，只要修改后重启应⽤实例，这样eureka应⽤会显⽰UP(1);
如：
{"description":"Remote status from Eureka server","status":"DOWN","discoveryComposite":
{"description":"Remote status from Eureka server","status":"DOWN","discoveryClient":{"description":"Spring Cloud Eureka Discovery Client","status":"UP","services":    ["sail-coupon","member-inf","sail_message","sail-route","sail-member","sail-point","gift-card"]},
"eureka":{"description":"Remote status from Eureka server","status":"DOWN","applications":
{"SAIL-MEMBER":1,"SAIL-POINT":1,"SAIL-COUPON":1,"MEMBER-INF":1,"GIFT-CARD":1,"SAIL_MESSAGE":1,"SAIL-MERCHANT":0,"SAIL-ROUTE":1}}},    "diskSpace":{"status":"UP","total":42842714112,"free":25094348800,"threshold":10485760},
"rabbit":{"status":"DOWN","error":"org.springframework.amqp.AmqpConnectException: java.ConnectException: Connection refused: connect"},
"redis":{"status":"UP","version":"3.2.100"},"db":{"status":"UP","database":"MySQL","hello":1},"refreshScope":{"status":"UP"},"hystrix":{"status":"UP"}}

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