springcloud-eureka集群及整合spring-security
本文会给大家讲解springcloud集成eureka及整合spring security相关配置。以及在整合过程中会出现的异常情况。
SpringCloud整合eureka
eureka服务中心项目添加pom依赖文件：
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<!--安全认证-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
<version>${spring-boot.version}</version>
</dependency>
</dependencies>
其中security为安全相关组件，也就是spring security。而spring-cloud-starter-netflix-eureka-server为spring cloud集成eureka相关依赖。
application.yml相关配置
server:
port: 8761
spring:
profiles: eureka-colony1
eureka:
instance:
hostname: eureka-colony1
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://admin:admin@192.168.1.108:8762/eureka/
server:
# 关闭自我保护
enable-self-preservation: false
# 清理服务器
eviction-interval-timer-in-ms: 60000
上述配置为eureka相关配置，其中defaultZone为链接另外一个eureka地址信息，前面的admin:admin@为指定访问的security所需的账户密码。相关的密码配置项如下：
security:
user:
name: admin
password: admin
集群部署时，另外一台部署情况与上述配置一致，只需修改hostname名称和defaultZone地址即可。
启动类添加注解：
@SpringBootApplication
@EnableEurekaServer
public class TmsEurekaApplication {
public static void main(String[] args) {
SpringApplication.run(TmsEurekaApplication.class, args);
}
}
启动类需要添加@EnableEurekaServer注解，用来启动eureka服务。
客户端配置
服务提供者与服务客户端要修改application.yml，修改注册链接，带上用户名密码：
# eureka注册中心使用用户名密码，所以这里要带上用户名密码向eureka注册 defaultZone: http://admin:admin@192.168.1.108:8761/eureka/, http://admin:admin@192.168.1.108:8762/eureka/
启动服务之后，访问http://192.168.1.108:8761，则会弹出如下登录框：
输入上面配置的用户名和密码配置即可。
启动2个服务提供者，已在eureka注册中心注册：
异常情况
不同版本的spring cloud和spring security，如果按照上述步骤来操作客户端连接eureka服务时，很可能会遇到下面的异常：
2019-01-06 21:31:46.147 WARN 3456 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failure with status code 401; retrying on another server if available 2019-01-06 21:31:46.160 WARN 3456 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_UNKNOWN/192.168.0.104:8090 - registration failed Cannot execute request on any known server com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.3.jar:1.9.3] at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_181] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]
这是因为springboot引入spring-boot-starter-security做安全校验后，自动开启CSRF安全认证，任何一次服务请求默认都需要CSRF 的token（自行补脑Spring的CSRF验证），而Eureka-client不会生成该token，故启动时会报如上错误。
解决方案：关闭csrf 验证，或者说关闭针对eureka路径的csrf验证。
在springboot项目中添加对应配置项目：
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().ignoringAntMatchers("/eureka/**");
super.configure(http);
}
}
这里仅忽略掉了/eureka请求路径的csrf验证。虽然也可以直接关闭csrf验证，但不推荐，具体操作如下：
@Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable();
super.configure(http);
}
如果查看官方文档，也是推荐第一种方式进行配置：
完成上述配置，重启整个服务即可解决链接的问题。
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