Eclipse配置运行SpringCloud（Hoxton + 2.2.4）微服务框架 + 搭建Eureka 以及高可用Eureka Server集群
springcloud是微服务架构的集大成者，基于springboot构建，将一系列优秀的组件进行了整合。
中文文档：https://springcloud.cc/
官方文档：http://projects.spring.io/spring-cloud/#quick-start
构建环境
请一定要注意spring boot版本和spring cloud版本的匹配关系：https://spring.io/projects/spring-cloud
| 软件 | 版本 |
|---|---|
| SpringCloud | Hoxton.RELEASE |
| Spring Boot | 2.2.4.RELEASE |
| Jdk | 1.8 |
| Maven | 3.6 |
一、创建注册中心
编写POM文件添加Spring-Cloud基本应用包
4.0.0
com.springcloud
springcloud-root
0.0.1-SNAPSHOT
pom
spring-cloud
http://maven.apache.org
UTF-8
org.springframework.boot
spring-boot-starter-parent
2.2.4.RELEASE
spring-register
springcloud-eureka
springcloud-common
springcloud-zuul
springcloud-eureka-cluster
org.springframework.cloud
spring-cloud-dependencies
Hoxton.RELEASE
pom
import
alimaven
Maven Aliyun Mirror
http://maven.aliyun.com/nexus/content/repositories/central/
true
false
junit
junit
test
二、创建注册中心项目springcloud-eureka
微服务架构中最核心的部分是服务治理，服务治理最基础的组件是注册中心。Spring Cloud支持了Zookeeper、Consul和Eureka，官方推荐Eureka。
创建一个maven-module，通过maven指定父类目录
添加依赖包文件POM.xml
4.0.0
com.springcloud
springcloud-root
0.0.1-SNAPSHOT
springcloud-eureka
springcloud-eureka
http://maven.apache.org
UTF-8
org.springframework.cloud
spring-cloud-starter-netflix-eureka-server
2.2.1.RELEASE
org.springframework.boot
spring-boot-starter-webflux
2.2.4.RELEASE
junit
junit
3.8.1
test
spring-cloud-starter-eureka-server:jar is missing 错误
Project build error: 'dependencies.dependency.version' for org.springframework.cloud:spring-cloud-starter-eureka-server:jar is missing.
change: spring-cloud-starter-eureka-server to spring-cloud-starter-netflix-eureka-server
添加注册中心启动类
package org.springcloud.eureka;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication //spring-boot 启动注解
@EnableEurekaServer // spring-cloud 服务注解
public class RegisterMain
{
public static void main( String[] args )
{
SpringApplication.run(RegisterMain.class, args);
}
}
配置application.yml文件
spring:
application:
# 当前服务名
name: springcloud-eureka
freemarker:
prefer-file-system-access: false
server:
# 端口号
port: 8899
---
eureka:
instance:
hostname: localhost
client:
# 检索服务
fetch-registry: false
# 是否将自己注册到eureka
register-with-eureka: false
# 客户端默认去这个地址找注册中心
service-url:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
server:
# 当eureka启动时，不能从集群节点中获取到instance注册信息，应该等多久
wait-time-in-ms-when-sync-empty: 0
enable-self-preservation: true
# eureka多长时间更新一次数据
peer-eureka-nodes-update-interval-ms: 100000
ERROR org.springframework.boot.SpringApplication - Application run failed 错误
15:02:33.112 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.([Ljava/lang/Object;)V
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:157)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:98)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:64)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140)
at org.springcloud.eureka.RegisterMain.main(RegisterMain.java:16)
spring boot版本兼容性导致的，在pom.xml中修改配置文件，将springcloud的版本与springboot的版本对应起来即可解决。
spring boot版本和spring cloud版本的匹配关系：
https://spring.io/projects/spring-cloud
| Spring Cloud | Spring Boot |
|---|---|
| Hoxton | 2.2.x |
| Greenwich | 2.1.x |
| Finchley | 兼容Spring Boot 2.0.x，不兼容Spring Boot 1.5.x |
| Dalston和Edgware | 兼容Spring Boot 1.5.x，不兼容Spring Boot 2.0.x |
| Camden | 兼容Spring Boot 1.4.x，也兼容Spring Boot 1.5.x |
| Brixton | 兼容Spring Boot 1.3.x，也兼容Spring Boot 1.4.x |
APPLICATION FAILED TO START 错误
***************************
APPLICATION FAILED TO START
***************************
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.cloud.client.discovery.health.DiscoveryCompositeHealthIndicator.(DiscoveryCompositeHealthIndicator.java:41)
The following method did not exist:
org.springframework.boot.actuate.health.CompositeHealthIndicator.(Lorg/springframework/boot/actuate/health/HealthAggregator;)V
The method's class, org.springframework.boot.actuate.health.CompositeHealthIndicator, is available from the following locations:
jar:file:/E:/SpringBoot/Maven-Repository/org/springframework/boot/spring-boot-actuator/2.2.4.RELEASE/spring-boot-actuator-2.2.4.RELEASE.jar!/org/springframework/boot/actuate/health/CompositeHealthIndicator.class
It was loaded from the following location:
file:/E:/SpringBoot/Maven-Repository/org/springframework/boot/spring-boot-actuator/2.2.4.RELEASE/spring-boot-actuator-2.2.4.RELEASE.jar
将springcloud的版本与springboot的版本对应起来即可解决。
Unable to start reactive web server 错误
org.springframework.context.ApplicationContextException: Unable to start reactive web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean.
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.onRefresh(ReactiveWebServerApplicationContext.java:81) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:66) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springcloud.eureka.RegisterMain.main(RegisterMain.java:15) [classes/:na]
Caused by: org.springframework.context.ApplicationContextException: Unable to start ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean.
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.getWebServerFactoryBeanName(ReactiveWebServerApplicationContext.java:100) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.createWebServer(ReactiveWebServerApplicationContext.java:88) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.onRefresh(ReactiveWebServerApplicationContext.java:78) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
添加webflux的依赖
org.springframework.boot
spring-boot-starter-webflux
2.2.4.RELEASE
运行启动类，访问http://localhost:8899即可，如下图
注册中心已经完成。
三、注册中心密码配置
在POM.xml中增加：
org.springframework.boot
spring-boot-starter-security
2.2.4.RELEASE
版本可以在此网站查询：
https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-security
application.yml 文件中增加配置
spring:
application:
name: springcloud-eureka
freemarker:
prefer-file-system-access: false
security:
basic:
enable: true
user:
name: admin
password: 123456
server:
port: 8899
---
eureka:
instance:
hostname: localhost
client:
fetch-registry: false
register-with-eureka: false
service-url:
defaultZone: http://${security.user.name}:${security.user.password}@${eureka.instance.hostname}:${server.port}/eureka/
server:
wait-time-in-ms-when-sync-empty: 0
enable-self-preservation: true
peer-eureka-nodes-update-interval-ms: 100000
再次启动后访问http://localhost:8899，如下图
输入用户名密码后，进入页面
四、创建服务注册到注册中心
创建一个maven module 项目
添加依赖包文件POM.xml
4.0.0
com.springcloud
springcloud-root
0.0.1-SNAPSHOT
springcloud-common
springcloud-common
http://maven.apache.org
UTF-8
org.springframework.cloud
spring-cloud-starter-netflix-eureka-server
2.2.1.RELEASE
org.springframework.boot
spring-boot-starter-webflux
2.2.4.RELEASE
junit
junit
3.8.1
test
添加客户端启动类
package org.springcloud.common;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient //Eureka Client
public class CommonClient
{
public static void main( String[] args )
{
SpringApplication.run(CommonClient.class, args);
}
}
配置application.yml文件
spring:
application:
name: springcloud-common
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8001
eureka:
instance:
hostname: localhost
client:
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@${eureka.instance.hostname}:8899/eureka/
运行客户端启动类，可以看到该客户端已经被注册到服务端，如下图
cannot execute any request on any know server 错误
在eurka服务中添加一个安全认证类
package org.springcloud.eureka;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
@EnableWebSecurity
@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
// Configure HttpSecurity as needed (e.g. enable http basic).
http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.NEVER);
http.csrf().disable();
//为了可以使用 http://${user}:${password}@${host}:${port}/eureka/ 这种方式登录,所以必须是httpBasic,
http.authorizeRequests().anyRequest().authenticated().and().httpBasic();
}
}
重新运行即可。
五、Eureka高可用集群
将 application.yml 文件复制三分：application-peer1.yml，application-peer2.yml，application-peer3.yml。
分别添加配置项如下：
- application-peer1.yml
spring:
application:
name: springcloud-eureka-cluster
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8897
---
eureka:
instance:
hostname: eureka-peer1.com
instance-id: eureka-peer1
client:
fetch-registry: true
register-with-eureka: true
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/
- application-peer2.yml
spring:
application:
name: springcloud-eureka-cluster
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8898
---
eureka:
instance:
hostname: eureka-peer2.com
instance-id: eureka-peer2
client:
fetch-registry: true
register-with-eureka: true
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/
- application-peer3.yml
spring:
application:
name: springcloud-eureka-cluster
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8899
---
eureka:
instance:
hostname: eureka-peer3.com
instance-id: eureka-peer3
client:
fetch-registry: true
register-with-eureka: true
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/
修改C:\Windows\System32\drivers\etc\hosts
127.0.0.1 eureka-peer1.com eureka-peer2.com eureka-peer3.com
maven install生成jar包，通过 spring.profiles.active 属性来分别启动三台服务器：
cd E:\SpringBoot\SpringCloud\springcloud-root\springcloud-eureka-cluster\target
java -jar springcloud-eureka-cluster-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1
java -jar springcloud-eureka-cluster-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2
java -jar springcloud-eureka-cluster-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer3
也可通过Run Configurations配置启动
-
访问 http://eureka-peer1.com:8897/
-
访问 http://eureka-peer2.com:8898/
-
访问http://eureka-peer3.com:8899/
Eureka服务注册集群各节点均在unavailable-replicas下错误
- 各个节点application名字要保持一致
- 本地测试时各个节点都在同一台机器，hostname需要在本地host中填写，各个节点使用自己的host
- prefer-ip-address设置为true或者默认不填写。
- register-with-eureka和fetch-registry都为true
- defaultZone不能使用localhost，需要使用自己在host中配置的域名，配置项为除自己以外的集群中所有节点。
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?错误
https://blog.csdn.net/lslk9898/article/details/73836745
六、启动多个服务提供者实例
启动多个springcloud-eureka-provider实例，端口分别为8001，8002和8003
- application-provider1.yml
spring:
application:
name: springcloud-eureka-provider
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8001
eureka:
instance:
hostname: eureka-provider1.com
instance-id: eureka-provider1
client:
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/
- application-provider2.yml
spring:
application:
name: springcloud-eureka-provider
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8002
eureka:
instance:
hostname: eureka-provider2.com
instance-id: eureka-provider2
client:
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/
- application-provider3.yml
spring:
application:
name: springcloud-eureka-provider
freemarker:
prefer-file-system-access: false
security:
user:
name: admin
password: 123456
server:
port: 8003
eureka:
instance:
hostname: eureka-provider3.com
instance-id: eureka-provider3
client:
service-url:
defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/
修改C:\Windows\System32\drivers\etc\hosts
127.0.0.1 eureka-provider1.com eureka-provider2.com eureka-provider3.com
通过Run Configurations配置启动
查看Eureka注册中心
http://eureka-peer1.com:8897/
http://eureka-peer2.com:8898/，http://eureka-peer3.com:8899/ 结果同上。
三个服务提供者实例已成功注册。