我正在使用Spring Cloud Kubernetes,我试图让feign能够根据kubernetes中存在的服务名称发送请求,但我做不到,当我尝试发送请求时,会出现以下错误。
"timestamp": "2019-12-06T15:37:50.285+0000",
"status": 500,
"error": "Internal Server Error",
"message": "com.netflix.client.ClientException: Load balancer does not have available server for client: poc-saldo",
"trace": "java.lang.RuntimeException: com.netflix.client.ClientException: Load balancer does not have available server for client: poc-saldo\n\tat org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute....
我试着调用集群中的其他服务 问题都是一样的 我做了一个测试,进入poc -deposit pod,做了一个poc -balance curl,它正常工作,所以问题不在于poc -deposit服务,平衡或kubernetes的服务发现显然。
这个项目的公开资料在。
https://gitlab.com/viniciusxyz/spring-kubernetes-feign
对于那些想要更直接信息的人,
我的主类如下:
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ServiceDiscoveryApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceDiscoveryApplication.class, args);
}
}
我和feign的接口如下:
@FeignClient("poc-saldo")
public interface ProxyGenerico {
@RequestMapping(method = RequestMethod.GET)
String getHttpResponse();
}
我可以在应用中列出kubernetes中可用的服务,如下所示。
@RestController
public class RestTest {
@Autowired
private DiscoveryClient discoveryClient;
@Autowired
private ProxyGenerico proxyGenerico;
@GetMapping("/services")
public ResponseEntity<?> services() {
return new ResponseEntity<Object>(discoveryClient.getServices(), HttpStatus.OK);
}
@GetMapping("/pocsaldo")
public ResponseEntity<?> gitlab() {
return new ResponseEntity<Object>(proxyGenerico.getHttpResponse(), HttpStatus.OK);
}
}
而在这个列表中,我有几个服务,其中我想访问的服务叫poc-balance,返回的json如下。
[
"poc-deposito",
"poc-saldo",
"sonarqube",
"sql-server-sonar",
"zookeeper",
"gitlab"
]
按照我的依赖关系来补充这个列表。
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes-ribbon</artifactId>
</dependency>
discoveryClient.getInstances("poc -saldo")命令返回:
[
{
"instanceId": "32a4db0d-0549-11ea-8850-e0d55ef66cf8",
"serviceId": "poc-saldo",
"secure": false,
"metadata": {
"helm.sh/chart": "spring-boot-app-0.1.23",
"port.http": "8080",
"app.kubernetes.io/managed-by": "Tiller",
"app.kubernetes.io/name": "poc-saldo",
"app.kubernetes.io/instance": "banco-digital-poc-saldo",
"app.kubernetes.io/version": "1.0"
},
"port": 8080,
"host": "10.42.0.60",
"scheme": "http://",
"uri": "http://10.42.0.60:8080"
}
]
你能想到问题可能出在哪里吗?
如果你使用Ribbon来进行负载均衡,我在你的错误中看到了这一点 org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient
你需要说Ribbon关于真实地址的所有微服务,并为这个动作发现客户端使用。
在你的主类上面,添加一些注解。
@EnableDiscoveryClient
@AutoConfigureAfter(RibbonAutoConfiguration.class)
@RibbonClients(defaultConfiguration = RibbonConfiguration.class)
public class MyApp
添加实现你的动态服务器列表
public class MyServerList extends AbstractServerList<Server> {
private final DiscoveryClient discoveryClient;
private IClientConfig clientConfig;
public MyServerList(DiscoveryClient discoveryClient) {
this.discoveryClient = discoveryClient;
}
@Override
public List<Server> getInitialListOfServers() {
return getUpdatedListOfServers();
}
@Override
public List<Server> getUpdatedListOfServers() {
Server[] servers = discoveryClient.getInstances(clientConfig.getClientName()).stream()
.map(i -> new Server(i.getHost(), i.getPort()))
.toArray(Server[]::new);
return Arrays.asList(servers);
}
@Override
public void initWithNiwsConfig(IClientConfig clientConfig) {
this.clientConfig = clientConfig;
}
}
添加RibbonConfiguration.class
public class RibbonConfiguration {
@Autowired
private DiscoveryClient discoveryClient;
@Bean
@ConditionalOnMissingBean
public ServerList<?> ribbonServerList(IClientConfig config) {
MyServerList myserverLis = new MyServerList(discoveryClient);
myserverLis.initWithNiwsConfig(config);
return myserverLis;
}
}
你可以在你的应用程序中配置属性刷新时间,我的意思是时间段,调用getUpdatedListOfServers。