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com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
解決方法，禁用 CSRF
package cn.netkiller.eureka.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
@Configuration
@EnableWebSecurity
public class SecurityConfigurerAdapter extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable();
super.configure(http);
}
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
super.configure(auth);
}
}
相同點：@EnableDiscoveryClient、@EnableEurekaClient 這二個註解作用，都可以讓該服務註冊到註冊中心上去。 不同點：@EnableEurekaClient 只支持Eureka註冊中心，@EnableDiscoveryClient 支持Eureka、Zookeeper、Consul 這三個註冊中心。
方法一，修改配置是讓Hystrix的超時時間改為5秒 hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000 方法二，修改配置，禁用Hystrix的超時時間 hystrix.command.default.execution.timeout.enabled: false 方法三，修改配置，用於索性禁用feign的hystrix。 feign.hystrix.enabled: false
由於 Eureka Server 清理無效節點周期長預設為90秒，可能會遇到微服務註銷慢甚至不註銷的問題。
Eureka Server 配置，注意僅適合開發環境。
# 設為false, 關閉自我保護， 從而保證會註銷微服務 eureka.server.enable-self-preservation=false # 清理間隔（單位毫秒，預設是60 * 1000） eureka.server.eviction-interval-timer-in-ms=30000
Eureka Client
配置開啟健康檢查，續約更新時間和到期時間。
# 設為true，開啟健康檢查（需要spring-boot-starter-actuator 依賴） eureka.client.healthcheck.enabled=ture # 續約更新時間間隔（預設是30秒） eureka.instance.lease-renewal-interval-in-seconds=20000 # 續約到期時間（預設90秒) eureka.instance.lease-expiration-duration-in-seconds=30000
問題分析，@PathVariable 找不到對應的參數
package api.feign;
import java.util.List;
import java.util.Map;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
@FeignClient("restful-api-service")
public interface Search {
@RequestMapping("/search/article/list")
public List<Map<String, Object>> list();
@RequestMapping("/search/article/{articleId}")
public Object read(@PathVariable String articleId);
}
解決方案
@RequestMapping("/search/article/{articleId}")
public Object read(@PathVariable("articleId") String articleId);
背景：我們需要共用 Feign 介面，故將 Feign 放到共用的 common-version.jar 包中，供其他項目使用。
啟動提示：Consider defining a bean of type 'common.feign.Cms' in your configuration.
註解加入包位置後解決
@EnableFeignClients("common.feign")
例 10.1. Share feign interface.
package cn.netkiller.feign;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients("common.feign")
public class Application {
public static void main(String[] args) {
System.out.println("Feign Starting...");
SpringApplication.run(Application.class, args);
}
}
com.netflix.client.ClientException: Load balancer does not have available server for client: restful
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>cn.netkiller.spring.cloud</groupId> <artifactId>eureka.client</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>eureka.client</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.3.RELEASE</version> <relativePath /> </parent> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Dalston.SR1</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <configuration> <skip>true</skip> </configuration> </plugin> </plugins> </build> </project>
package cn.netkiller.spring.cloud.eureka.client;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
package cn.netkiller.spring.cloud.eureka.client;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestRestController {
private static final Logger logger = LoggerFactory.getLogger(TestRestController.class);
@RequestMapping("/")
public String home() {
logger.info("Hello!!!");
return "Hello World";
}
@Autowired
private DiscoveryClient discoveryClient;
@RequestMapping("/service-instances/{applicationName}")
public List<ServiceInstance> serviceInstancesByApplicationName(@PathVariable String applicationName) {
return this.discoveryClient.getInstances(applicationName);
}
@RequestMapping(value = "/add", method = RequestMethod.GET)
public Integer add(@RequestParam Integer a, @RequestParam Integer b) {
@SuppressWarnings("deprecation")
ServiceInstance instance = discoveryClient.getLocalServiceInstance();
Integer r = a + b;
logger.info("/add, host:" + instance.getHost() + ", service_id:" + instance.getServiceId() + ", result:" + r);
return r;
}
@RequestMapping("/greeting")
public String greeting() {
return "GREETING";
}
}
spring.application.name=test-service server.port=8080 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
首先確認客戶端已經註冊到 http://localhost:8761/
 |
$ curl http://localhost:8080/service-instances/test-service
[
{
"host": "Neo-Desktop",
"port": 8080,
"secure": false,
"uri": "http://Neo-Desktop:8080",
"serviceId": "TEST-SERVICE",
"metadata": {},
"instanceInfo": {
"instanceId": "Neo-Desktop:test-service:8080",
"app": "TEST-SERVICE",
"appGroupName": null,
"ipAddr": "172.25.10.150",
"sid": "na",
"homePageUrl": "http://Neo-Desktop:8080/",
"statusPageUrl": "http://Neo-Desktop:8080/info",
"healthCheckUrl": "http://Neo-Desktop:8080/health",
"secureHealthCheckUrl": null,
"vipAddress": "test-service",
"secureVipAddress": "test-service",
"countryId": 1,
"dataCenterInfo": {
"@class": "com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo",
"name": "MyOwn"
},
"hostName": "Neo-Desktop",
"status": "UP",
"leaseInfo": {
"renewalIntervalInSecs": 30,
"durationInSecs": 90,
"registrationTimestamp": 1497922681680,
"lastRenewalTimestamp": 1497922681680,
"evictionTimestamp": 0,
"serviceUpTimestamp": 1497922003783
},
"isCoordinatingDiscoveryServer": false,
"metadata": {},
"lastUpdatedTimestamp": 1497922681680,
"lastDirtyTimestamp": 1497922681025,
"actionType": "ADDED",
"asgName": null,
"overriddenStatus": "UNKNOWN"
}
}
]
add 介面測試
curl http://localhost:8080/add.json?a=5&b=3 8
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>cn.netkiller</groupId> <artifactId>config</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>config</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.RELEASE</version> <relativePath /> </parent> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config</artifactId> <version>1.3.1.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
Application
package cn.netkiller.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.config.server.EnableConfigServer;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableAutoConfiguration
@EnableDiscoveryClient
@EnableConfigServer
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
server.port=8888 spring.cloud.config.server.git.uri=https://github.com/netkiller/config.git
克隆倉庫
git clone https://github.com/netkiller/config.git
創建配置檔案 server-development.properties
vim server-development.properties test.a=KKOOKK message=Hello world
提交配置檔案
git commit -a git push
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>netkiller.cn</groupId> <artifactId>cloud</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.RELEASE</version> <relativePath /> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config</artifactId> <version>1.3.1.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
package cn.netkiller.cloud.client;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
@RefreshScope
@RestController
class MessageRestController {
@Value("${message:Hello default}")
private String message;
@RequestMapping("/message")
String getMessage() {
return this.message;
}
}
注意 @RefreshScope 註解
spring.application.name=server-development spring.cloud.config.uri=http://localhost:8888 management.security.enabled=false