配置信息
eureka-server
spring.application.name=eureka-server
server.port=1111
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka-client
spring.application.name=eureka-client
server.port=8002
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/
错误分析
如上配置,配置信息非常简单.在启动eureka-server
的时候并未发现任何异常,但是在启动eureka-client
的时候,控制台却输出如下信息:
com.sun.jersey.api.client.ClientHandlerException: org.apache.http.conn.ConnectTimeoutException: Connect to localhost:8761 timed out
at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1]
at com.netflix.eureka.cluster.DynamicGZIPContentEncodingFilter.handle(DynamicGZIPContentEncodingFilter.java:48) ~[eureka-core-1.7.0.jar:1.7.0]
at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.7.0.jar:1.7.0]
at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar:1.19.1]
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar:1.19.1]
at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar:1.19.1]
at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:570) ~[jersey-client-1.19.1.jar:1.19.1]
at com.netflix.eureka.transport.JerseyReplicationClient.submitBatchUpdates(JerseyReplicationClient.java:116) ~[eureka-core-1.7.0.jar:1.7.0]
at com.netflix.eureka.cluster.ReplicationTaskProcessor.process(ReplicationTaskProcessor.java:71) ~[eureka-core-1.7.0.jar:1.7.0]
at com.netflix.eureka.util.batcher.TaskExecutors$BatchWorkerRunnable.run(TaskExecutors.java:187) [eureka-core-1.7.0.jar:1.7.0]
看着这段揪心的提示后反复检查了配置和代码,实在想不明白哪个地方有配置8761
端口号.
在这个时候打开注册中心localhost:1111
后也看到eureka-client
服务也注册上来了,那为什么会报这个错了,莫非eureka
有自己的默认配置?
在一番搜索后得到了答案(问题传送门),因为我并未指定eureka-server
的service-url
属性,所以在服务注册过来的时候eureka-server
会尝试将注册信息复制到默认的service-url
,即 localhost:8761
上面.所以才会报出这样的错误!
解决方案
既然上面分析出来了问题,那么解决就很容易 ,即覆盖eureka-server
的默认的属性service-url
就可以了,在eureka-server
添加如下代码:
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/
默认配置
在得知上面的解决方案后,不禁思考eureka的这些默认配置在哪里呢?他们的默认属性值又是多少?
eureka的这些默认配置是存在org.springframework.cloud.netflix.eureka.EurekaClientConfigBean
类里面.
@Data
@ConfigurationProperties(EurekaClientConfigBean.PREFIX)
public class EurekaClientConfigBean implements EurekaClientConfig, EurekaConstants {
public static final String PREFIX = "eureka.client";
@Autowired(required = false)
PropertyResolver propertyResolver;
public static final String DEFAULT_URL = "http://localhost:8761" + DEFAULT_PREFIX
+ "/";
public static final String DEFAULT_ZONE = "defaultZone";
private static final int MINUTES = 60;
private boolean enabled = true;
@NestedConfigurationProperty
private EurekaTransportConfig transport = new CloudEurekaTransportConfig();
private int registryFetchIntervalSeconds = 30;
private int instanceInfoReplicationIntervalSeconds = 30;
private int initialInstanceInfoReplicationIntervalSeconds = 40;
private int eurekaServiceUrlPollIntervalSeconds = 5 * MINUTES;
private String proxyPort;
private String proxyHost;
private String proxyUserName;
private String proxyPassword;
private int eurekaServerReadTimeoutSeconds = 8;
private int eurekaServerConnectTimeoutSeconds = 5;
private String backupRegistryImpl;
private int eurekaServerTotalConnections = 200;
private int eurekaServerTotalConnectionsPerHost = 50;
private String eurekaServerURLContext;
private String eurekaServerPort;
private String eurekaServerDNSName;
private String region = "us-east-1";
//......略
看到这里一切都豁然开朗了
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