Eureka常用配置

一 Eureka的架构图

二常用配置

心跳配置

服务列表抓取配置

元数据的配置和使用

关闭自我保护模式

三新建ek-server项目

1 配置

server:
  port: 8761
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
  server:
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 5000

四新建ek-provider项目

1 配置

spring:
  application:
    name: ek-provider
eureka:
  instance:
    leaseRenewalIntervalInSeconds: 5
    leaseExpirationDurationInSeconds: 10
    metadata-map:
      company-name: crazyit
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
logging:
  level:
    com.netflix: DEBUG

2 测试心跳是5秒

2018-07-15 12:02:31.932 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.MonitoredConnectionManager  : Get connection: {}->http://localhost:8761, timeout = 5000
2018-07-15 12:02:31.932 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : [{}->http://localhost:8761] total kept alive: 1, total issued: 0, total allocated: 1 out of 200
2018-07-15 12:02:31.932 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Getting free connection [{}->http://localhost:8761][null]
2018-07-15 12:02:31.935 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.MonitoredConnectionManager  : Released connection is reusable.
2018-07-15 12:02:31.935 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Releasing connection [{}->http://localhost:8761][null]
2018-07-15 12:02:31.935 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Pooling connection [{}->http://localhost:8761][null]; keep alive indefinitely
2018-07-15 12:02:31.935 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Notifying no-one, there are no waiting threads
2018-07-15 12:02:31.935 DEBUG 1296 --- [tbeatExecutor-0] n.d.s.t.j.AbstractJerseyEurekaHttpClient : Jersey HTTP PUT http://localhost:8761/eureka//apps/EK-PROVIDER/DESKTOP-5SDKDG4:ek-provider; statusCode=200
2018-07-15 12:02:31.935 DEBUG 1296 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EK-PROVIDER/DESKTOP-5SDKDG4:ek-provider - Heartbeat status: 200
2018-07-15 12:02:36.936 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.MonitoredConnectionManager  : Get connection: {}->http://localhost:8761, timeout = 5000
2018-07-15 12:02:36.936 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : [{}->http://localhost:8761] total kept alive: 1, total issued: 0, total allocated: 1 out of 200
2018-07-15 12:02:36.936 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Getting free connection [{}->http://localhost:8761][null]
2018-07-15 12:02:36.940 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.MonitoredConnectionManager  : Released connection is reusable.
2018-07-15 12:02:36.940 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Releasing connection [{}->http://localhost:8761][null]
2018-07-15 12:02:36.940 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Pooling connection [{}->http://localhost:8761][null]; keep alive indefinitely
2018-07-15 12:02:36.940 DEBUG 1296 --- [tbeatExecutor-0] c.n.d.shared.NamedConnectionPool         : Notifying no-one, there are no waiting threads
2018-07-15 12:02:36.940 DEBUG 1296 --- [tbeatExecutor-0] n.d.s.t.j.AbstractJerseyEurekaHttpClient : Jersey HTTP PUT http://localhost:8761/eureka//apps/EK-PROVIDER/DESKTOP-5SDKDG4:ek-provider; statusCode=200
2018-07-15 12:02:36.940 DEBUG 1296 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EK-PROVIDER/DESKTOP-5SDKDG4:ek-provider - Heartbeat status: 200
2018-07-15 12:02:39.080 DEBUG 1296 --- [t-Conn-Cleaner2] c.n.d.shared.MonitoredConnectionManager  : Closing connections idle longer than 30000 SECONDS
2018-07-15 12:02:39.080 DEBUG 1296 --- [t-Conn-Cleaner2] c.n.d.shared.NamedConnectionPool         : Closing connections idle longer than 30000 SECONDS
2018-07-15 12:02:39.093 DEBUG 1296 --- [t-Conn-Cleaner2] c.n.d.shared.MonitoredConnectionManager  : Closing connections idle longer than -1 SECONDS
2018-07-15 12:02:39.093 DEBUG 1296 --- [t-Conn-Cleaner2] c.n.d.shared.NamedConnectionPool         : Closing connections idle longer than 0 SECONDS
2018-07-15 12:02:39.093 DEBUG 1296 --- [t-Conn-Cleaner2] c.n.d.shared.NamedConnectionPool         : Closing connection last used @ Sun Jul 15 12:02:36 CST 2018
2018-07-15 12:02:39.093 DEBUG 1296 --- [t-Conn-Cleaner2] c.n.d.shared.NamedConnectionPool         : Deleting connection [{}->http://localhost:8761][null]

3 测试10秒超期

关闭ek-provider项目，超过10秒后访问Eureka信息页面

四新建ek-invoker

1 新建配置

server:
  port: 8081
spring:
  application:
    name: ek-invoker
eureka:
  client:
    registry-fetch-interval-seconds: 30
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
logging:
  level:
com.netflix: DEBUG

2 新建控制类

package org.crazyit.cloud;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestTemplate;

@Controller
@Configuration
public class TestController {
    
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }

    @GetMapping("/router")
    @ResponseBody
    public String router() {
        RestTemplate tpl = getRestTemplate();
        String json = tpl.getForObject("http://first-police/call/1", String.class);
        return json;
    }
    
    @Autowired
    private DiscoveryClient discoveryClient;

    @GetMapping("/list")
    @ResponseBody
    public String serviceCount() {
        List<String> names = discoveryClient.getServices();
        for(String serviceId : names) {
            List<ServiceInstance> instances = discoveryClient.getInstances(serviceId);
            System.out.println(serviceId + ": " + instances.size());
        }
        return "";
    }

    @GetMapping("/meta")
    @ResponseBody
    public String getMetadata() {
        List<ServiceInstance> instances = discoveryClient.getInstances("ek-provider");
        for(ServiceInstance ins : instances) {
            String name = ins.getMetadata().get("company-name");
            System.out.println(ins.getPort() + "---" + name);
        }
        return "";
    }
    

}

3 测试

输入： http://localhost:8081/list

ek-provider: 1
ek-invoker: 1

输入： http://localhost:8081/meta

8080---crazyit

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