Spring 云:Zuul 投掷 "Load balancer does not have available server for client"
Spring Cloud : Zuul throwing "Load balancer does not have available server for client"
我正在尝试让一个简单的微服务注册到 Eureka 服务器,然后让 Zuul 代理到微服务。我让微服务注册到 Eureka 服务器。但是,每当我启动 Zuul 服务时,我都会发现它没有注册到 Eureka 服务器。每当我尝试路由到微服务时,都会出现以下异常:
Load balancer does not have available server for client: microservice
我无法弄清楚问题出在哪里。任何帮助将不胜感激
下面是每个组件的 Spring 启动 类。
微服务组件
MicroserviceApplication.java
@SpringBootApplication(scanBasePackages = { "some.package.controller", "some.package.service" })
@EnableEurekaClient
@EnableJpaRepositories("some.package.repository")
@EntityScan("some.package.entity")
public class MicroserviceApplication {
public static void main(String[] args) {
SpringApplication.run(MicroserviceApplication.class, args);
}
}
bootstrap.yml
server:
port: 8090
info:
component: Core Services
spring:
application:
name: microservice
application.yml
eureka:
instance:
leaseRenewalIntervalInSeconds: 1
leaseExpirationDurationInSeconds: 2
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
healthcheck:
enabled: true
lease:
duration: 5
#some other logging and jpa properties below
Eureka 服务器组件
EurekaServerApplication.java
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
bootstrap.yml
spring:
application:
name: discovery-server
application.yml
server:
port: 8761
info:
component: Discovery Server
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
instance:
hostname: localhost
server:
waitTimeInMsWhenSyncEmpty: 0
API 网关组件
ZuulGatewayApplication.java
@SpringBootApplication
@EnableZuulProxy
public class ZuulGatewayApplication {
public static void main(String[] args) {
SpringApplication.run(ZuulGatewayApplication.class, args);
}
@Bean
public ZuulGatewayPreFilter gatewayPreFilter() {
return new ZuulGatewayPreFilter();
}
}
bootstrap.yml
spring:
application:
name: api-gateway
application.yml
server:
port: 8888
info:
component: API Gateway
eureka:
instance:
leaseRenewalIntervalInSeconds: 1
leaseExpirationDurationInSeconds: 2
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
zuul:
routes:
microservice:
path: /microservice/**
serviceId: microservice
添加 @EnableEurekaClient
解决了这个问题。 Zuul 应用程序现在可以在 Eureka 服务器中发现并且能够路由请求。
错误 spring.application.name 可能是此错误的其他原因
将 @EnableEurekaClient 添加到 Zuul 应用程序 class.
我在我的 Zuul 应用程序 @EnableZuulClient 上有正确的注释,但仍然出现该错误。
问题是我同时启动了所有应用程序(Eureka、Zuul 和第三个应用程序),而不是一个一个地启动。所以他们都需要时间来注册。一段时间后,错误消失了,我可以通过 Zuul 客户端访问我的服务。
我正在尝试让一个简单的微服务注册到 Eureka 服务器,然后让 Zuul 代理到微服务。我让微服务注册到 Eureka 服务器。但是,每当我启动 Zuul 服务时,我都会发现它没有注册到 Eureka 服务器。每当我尝试路由到微服务时,都会出现以下异常:
Load balancer does not have available server for client: microservice
我无法弄清楚问题出在哪里。任何帮助将不胜感激
下面是每个组件的 Spring 启动 类。
微服务组件
MicroserviceApplication.java
@SpringBootApplication(scanBasePackages = { "some.package.controller", "some.package.service" })
@EnableEurekaClient
@EnableJpaRepositories("some.package.repository")
@EntityScan("some.package.entity")
public class MicroserviceApplication {
public static void main(String[] args) {
SpringApplication.run(MicroserviceApplication.class, args);
}
}
bootstrap.yml
server:
port: 8090
info:
component: Core Services
spring:
application:
name: microservice
application.yml
eureka:
instance:
leaseRenewalIntervalInSeconds: 1
leaseExpirationDurationInSeconds: 2
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
healthcheck:
enabled: true
lease:
duration: 5
#some other logging and jpa properties below
Eureka 服务器组件
EurekaServerApplication.java
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
bootstrap.yml
spring:
application:
name: discovery-server
application.yml
server:
port: 8761
info:
component: Discovery Server
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
instance:
hostname: localhost
server:
waitTimeInMsWhenSyncEmpty: 0
API 网关组件
ZuulGatewayApplication.java
@SpringBootApplication
@EnableZuulProxy
public class ZuulGatewayApplication {
public static void main(String[] args) {
SpringApplication.run(ZuulGatewayApplication.class, args);
}
@Bean
public ZuulGatewayPreFilter gatewayPreFilter() {
return new ZuulGatewayPreFilter();
}
}
bootstrap.yml
spring:
application:
name: api-gateway
application.yml
server:
port: 8888
info:
component: API Gateway
eureka:
instance:
leaseRenewalIntervalInSeconds: 1
leaseExpirationDurationInSeconds: 2
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
zuul:
routes:
microservice:
path: /microservice/**
serviceId: microservice
添加 @EnableEurekaClient
解决了这个问题。 Zuul 应用程序现在可以在 Eureka 服务器中发现并且能够路由请求。
错误 spring.application.name 可能是此错误的其他原因 将 @EnableEurekaClient 添加到 Zuul 应用程序 class.
我在我的 Zuul 应用程序 @EnableZuulClient 上有正确的注释,但仍然出现该错误。
问题是我同时启动了所有应用程序(Eureka、Zuul 和第三个应用程序),而不是一个一个地启动。所以他们都需要时间来注册。一段时间后,错误消失了,我可以通过 Zuul 客户端访问我的服务。