Spring Cloud入门教程-微服务监控Spring Boot Admin

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项目源码及相关说明请查看此文：Spring Cloud入门教程-简介Spring Boot Admin 用于管理和监控一个或多个Spring Boot程序，在 Spring Boot Actuator 的基础上提供简洁的可视化 WEB UI，提供如下功能：

• 显示 name/id 和版本号
• 显示在线状态
• Logging 日志级别管理
• JMX beans 管理
• Threads 会话和线程管理
• Trace 应用请求跟踪
• 应用运行参数信息，如：
  • Java 系统属性
  • Java 环境变量属性
  • 内存信息
  • Spring 环境属性

使用Spring Boot Admin监控Spring Cloud微服务

首先需要一个服务注册中心Eureka Server，让Spring Boot Admin（以下简称 SBA）服务端向它注册服务。

创建新的module admin-server，pom.xml 如下：

<?xml version="1.0" encoding="UTF-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>
	<parent>
		<groupId>com.springcloud.demo</groupId>
		<artifactId>springcloud-demo</artifactId>
		<version>1.0-SNAPSHOT</version>
	</parent>
	<artifactId>admin-server</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>admin-server</name>
	<description>Demo project for Spring Boot</description>


	<dependencies>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>de.codecentric</groupId>
			<artifactId>spring-boot-admin-starter-server</artifactId>
			<version>2.0.1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
		</dependency>
		<dependency>
			<groupId>org.jolokia</groupId>
			<artifactId>jolokia-core</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-security</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>

改版本的 spring cloud 没有相应的 spring-boot-admin-starter-server 版本，这里使用2.0.1 版本，需加上版本号。

 启动类加上注解@EnableAdminServer和@EnableEurekaClient

@EnableEurekaClient
@EnableAdminServer
@SpringBootApplication
@ComponentScan("com.springcloud.demo.adminserver")
public class AdminServerApplication {

	public static void main(String[] args) {
		SpringApplication.run(AdminServerApplication.class, args);
	}
}

配置文件配置端口号、程序名、服务注册中心地址和安全配置：
 

server.port=5000

spring.application.name=admin-server

spring.security.user.name=admin
spring.security.user.password=admin

eureka.instance.metadata-map.user.name=${spring.security.user.name}
eureka.instance.metadata-map.user.password=${spring.security.user.password}

eureka.client.service-url.defaultZone=http://localhost:8791/eureka/
eureka.instance.health-check-url-path=/actuator/health



management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

新增一个安全配置类。

@Configuration
public class SecuritySecureConfig extends WebSecurityConfigurerAdapter {

    private final String adminContextPath;

    public SecuritySecureConfig(AdminServerProperties adminServerProperties) {
        this.adminContextPath = adminServerProperties.getContextPath();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        // @formatter:off
        SavedRequestAwareAuthenticationSuccessHandler successHandler = new SavedRequestAwareAuthenticationSuccessHandler();
        successHandler.setTargetUrlParameter("redirectTo");

        http.authorizeRequests()
                .antMatchers(adminContextPath + "/assets/**").permitAll()
                .antMatchers(adminContextPath + "/login").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin().loginPage(adminContextPath + "/login").successHandler(successHandler).and()
                .logout().logoutUrl(adminContextPath + "/logout").and()
                .httpBasic().and()
                .csrf().disable();
        
    }


}

创建客户端

新建module admin-client :

<?xml version="1.0" encoding="UTF-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>
	<parent>
		<groupId>com.springcloud.demo</groupId>
		<artifactId>springcloud-demo</artifactId>
		<version>1.0-SNAPSHOT</version>
	</parent>
	<artifactId>admin-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>admin-client</name>
	<description>Demo project for Spring Boot</description>



	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>de.codecentric</groupId>
			<artifactId>spring-boot-admin-starter-client</artifactId>
			<version>2.0.1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</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>

启动类添加注解@EnableEurekaClient

@EnableEurekaClient
@SpringBootApplication
public class AdminClientApplication {

	public static void main(String[] args) {
		SpringApplication.run(AdminClientApplication.class, args);
	}
}

 添加配置;

eureka.client.service-url.defaultZone=http://localhost:8791/eureka/
#表示eureka client发送心跳给server端的频率，默认为30秒
eureka.instance.lease-renewal-interval-in-seconds=10
#表示eureka client间隔多久去拉取服务注册信息，默认为30秒
eureka.client.registry-fetch-interval-seconds=10

eureka.instance.health-check-url-path=/actuator/health

management.endpoints.web.exposure.include=*

management.endpoint.health.show-details=always

启动eureka-server，admin-server ,admin-client.浏览器访问：http://localhost:5000

输入配置的admin，admin --->>login .

Eureka 的 metadataMap

Eureka 中的 metadataMap 是专门用来存放一些自定义的数据，当注册中心或者其他服务需要此服务的某些配置时可以在 metadataMap 里取。实际上，每个 instance 都有各自的 metadataMap，map 中存放着需要用到的属性。例如，上面配置中的 eureka.instance.metadata-map.user.name，当这个服务成功注册到 Eureka 上，Spring Boot Admin 就会取拿到这个 instance，进而拿到 metadataMap 里的属性，然后放入请求头，向此服务发送请求，访问此服务的 Actuator 开放的端点。