Spring Boot Admin 入门

Spring Boot Admin 简介

简而言之，Spring Boot Admin是用来管理和监视您的Spring Boot应用程序的。应用程序需要注册为客户端，UI由AngularJs开发。对于Spring Admin来说，需要分别配置好服务端和客户端。服务端我们将其理解为一个Servlet应用，客户端即为要监控的Springboot应用。

以下为Spring Admin官方文档的说明：

codecentric’s Spring Boot Admin is a community project to manage and monitor your Spring Boot ® applications. The applications register with our Spring Boot Admin Client (via HTTP) or are discovered using Spring Cloud ® (e.g. Eureka, Consul). The UI is just an AngularJs application on top of the Spring Boot Actuator endpoints.

Spring Boot Admin Server 设置

建立Springboot项目，Springboot Admin Server设置为servlet或webflux应用。

引入相关依赖至pom.xml

将pom.xml插入以下依赖

<dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-server</artifactId><version>2.2.0</version>
</dependency>
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>

配置主启动类注解

配置主启动类注解@EnableAdminServer

@Configuration
@EnableAutoConfiguration
@EnableAdminServer
public class SpringBootAdminApplication {public static void main(String[] args) {SpringApplication.run(SpringBootAdminApplication.class, args);}
}

启动项目，在浏览器输入http://localhost:8080/，可得到SpringAdmin监控页面

这里插一个坑，若遇到下图所示项目启动失败

2020-08-30 13:30:17.094  INFO 25568 --- [           main] c.e.a.AdminserverdemoApplication         : Starting AdminserverdemoApplication on DESKTOP-K6A15G9 with PID 25568 (D:\北京邮电大学\实验室实习\Iaas升级\SpringbootAdmin\target\classes started by 吴宇轩 in D:\北京邮电大学\实验室实习\Iaas升级\SpringbootAdmin)
2020-08-30 13:30:17.101  INFO 25568 --- [           main] c.e.a.AdminserverdemoApplication         : No active profile set, falling back to default profiles: default
2020-08-30 13:30:19.255  INFO 25568 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-08-30 13:30:19.277  INFO 25568 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-08-30 13:30:19.277  INFO 25568 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-08-30 13:30:19.280  INFO 25568 --- [           main] o.a.catalina.core.AprLifecycleListener   : Loaded Apache Tomcat Native library [1.2.23] using APR version [1.7.0].
2020-08-30 13:30:19.280  INFO 25568 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2020-08-30 13:30:19.281  INFO 25568 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2020-08-30 13:30:19.285  INFO 25568 --- [           main] o.a.catalina.core.AprLifecycleListener   : OpenSSL successfully initialized [OpenSSL 1.1.1c  28 May 2019]
2020-08-30 13:30:19.423  INFO 25568 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-08-30 13:30:19.423  INFO 25568 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2237 ms
2020-08-30 13:30:19.837  INFO 25568 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-08-30 13:30:19.839  WARN 25568 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'webMvcAsyncTaskExecutor' available
2020-08-30 13:30:19.839  INFO 25568 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2020-08-30 13:30:19.846  INFO 25568 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-08-30 13:30:19.868  INFO 25568 --- [           main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-08-30 13:30:19.987 ERROR 25568 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : ***************************
APPLICATION FAILED TO START
***************************Description:Method requestMappingHandlerAdapter in org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration required a bean named 'webMvcAsyncTaskExecutor' that could not be found.Action:Consider defining a bean named 'webMvcAsyncTaskExecutor' in your configuration.Process finished with exit code 1

则为SpringBootAdmin版本问题，将版本改为2.2.0即可

配置Spring Boot Admin Client

新建一个Spring Boot项目

添加依赖至pom.xml

<dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-client</artifactId><version>2.2.0</version>
</dependency>
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId>
</dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>

将此应用注册应用到服务端

再application.properties中添加相关参数

spring.boot.admin.client.url=http://localhost:8888
#这里公开了所有的端点
management.endpoints.web.exposure.include=*
server.port=8889

添加配置类SecurityPermitAllConfig使执行器端点可访问

package com.example.adminclientdemo;import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;public class SecurityPermitAllConfig extends WebSecurityConfigurerAdapter {@Overrideprotected void configure(HttpSecurity http) throws Exception {http.authorizeRequests().anyRequest().permitAll().and().csrf().disable();}
}

展现客户端版本信息

现在启动应用就可以在管理页面看到该客户端实例信息，为了展示客户端版本信息（其它信息请查阅Spring Boot Reference Guide)，要在build的时候列出build-info，修改pom.xml*。

<build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><executions><execution><goals><goal>build-info</goal></goals></execution></executions></plugin></plugins>
</build>

启动Server端，将client端打包成jar包并运行，可以看到如下网页进行监控

显示了build-info信息

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