SpringBoot admin 2.0 详解

一、什么是Spring Boot Admin ？

Spring Boot Admin是一个开源社区项目，用于管理和监控SpringBoot应用程序。 应用程序作为Spring Boot Admin Client向为Spring Boot Admin Server注册（通过HTTP）或使用SpringCloud注册中心（例如Eureka，Consul）发现。 UI是的Vue.js应用程序，展示Spring Boot Admin Client的Actuator端点上的一些监控。服务端采用Spring WebFlux + Netty的方式。Spring Boot Admin为注册的应用程序提供以下功能：

• 显示健康状况
• 显示详细信息，例如
• JVM和内存指标
• micrometer.io指标
• 数据源指标
• 缓存指标
• 显示构建信息编号
• 关注并下载日志文件
• 查看jvm system-和environment-properties
• 查看Spring Boot配置属性
• 支持Spring Cloud的postable / env-和/ refresh-endpoint
• 轻松的日志级管理
• 与JMX-beans交互
• 查看线程转储
• 查看http-traces
• 查看auditevents
• 查看http-endpoints
• 查看计划任务
• 查看和删除活动会话（使用spring-session）
• 查看Flyway / Liquibase数据库迁移
• 下载heapdump
• 状态变更通知（通过电子邮件，Slack，Hipchat，…）
• 状态更改的事件日志（非持久性）

二、入门

1. 创建 Spring Boot Admin Server

pom.xml

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gf</groupId>
    <artifactId>admin-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>admin-server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot-admin.version>2.1.0</spring-boot-admin.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>${spring-boot-admin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  application:
    name: admin-server
server:
  port: 8769

启动类 AdminServerApplication

启动类加上@EnableAdminServer注解，开启AdminServer的功能：

@SpringBootApplication
@EnableAdminServer
public class AdminServerApplication {

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

}

2. 创建 Spring Boot Admin Client

pom.xml

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gf</groupId>
    <artifactId>admin-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>admin-client</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot-admin.version>2.1.0</spring-boot-admin.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>${spring-boot-admin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

• spring.boot.admin.client.url：要注册的Spring Boot Admin Server的URL。
• management.endpoints.web.exposure.include：与Spring Boot 2一样，默认情况下，大多数actuator的端口都不会通过http公开，* 代表公开所有这些端点。对于生产环境，应该仔细选择要公开的端点。

spring:
  application:
    name: admin-client
  boot:
    admin:
      client:
        url: http://localhost:8769
server:
  port: 8768

management:
  endpoints:
    web:
      exposure:
        include: '*'
  endpoint:
    health:
      show-details: ALWAYS

启动类 AdminClientApplication

@SpringBootApplication
public class AdminClientApplication {

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

}

启动两个工程，在浏览器上输入localhost:8769 ，浏览器显示的界面如下：

查看wallboard：

点击wallboard，可以查看admin-client具体的信息，比如内存状态信息：

查看spring bean的情况：

查看应用程序运行状况，信息和详细：

还有很多监控信息，多点一点就知道。

三、集成 Eureka

1. 创建 sc-eureka-server

这是一个 eureka-server 注册中心。

pom.xml

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gf</groupId>
    <artifactId>sc-admin-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sc-admin-server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot-admin.version>2.1.0</spring-boot-admin.version>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-server</artifactId>
            <version>2.1.0</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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jolokia</groupId>
            <artifactId>jolokia-core</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>${spring-boot-admin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  application:
    name: sc-eureka-server
server:
  port: 8761
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka
    register-with-eureka: false
    fetch-registry: false
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS

启动类 ScEurekaServerApplication

@SpringBootApplication
@EnableEurekaServer
public class ScEurekaServerApplication {

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

}

2. 创建 sc-admin-server

这是一个 Spring Boot Admin Server端。

pom.xml

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gf</groupId>
    <artifactId>sc-admin-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sc-admin-server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot-admin.version>2.1.0</spring-boot-admin.version>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-server</artifactId>
            <version>2.1.0</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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jolokia</groupId>
            <artifactId>jolokia-core</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>${spring-boot-admin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  application:
    name: admin-server
server:
  port: 8769
eureka:
  client:
    registryFetchIntervalSeconds: 5
    service-url:
      defaultZone: ${EUREKA_SERVICE_URL:http://localhost:8761}/eureka/
  instance:
    leaseRenewalIntervalInSeconds: 10
    health-check-url-path: /actuator/health

management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS

启动类 ScAdminServerApplication

@SpringBootApplication
@EnableAdminServer
@EnableDiscoveryClient
public class ScAdminServerApplication {

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

}

3. 创建 sc-admin-client

这是一个 Spring Boot Admin client 端。

pom.xml

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gf</groupId>
    <artifactId>sc-admin-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sc-admin-client</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-boot-admin.version>2.1.0</spring-boot-admin.version>
        <spring-cloud.version>Finchley.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <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-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
        </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>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>de.codecentric</groupId>
                <artifactId>spring-boot-admin-dependencies</artifactId>
                <version>${spring-boot-admin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  application:
    name: sc-admin-client
eureka:
  instance:
    leaseRenewalIntervalInSeconds: 10
    health-check-url-path: /actuator/health

  client:
    registryFetchIntervalSeconds: 5
    service-url:
      defaultZone: ${EUREKA_SERVICE_URL:http://localhost:8761}/eureka/
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS
server:
  port: 8762

启动类 ScAdminClientApplication

@SpringBootApplication
@EnableDiscoveryClient
public class ScAdminClientApplication {

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

}

启动三个工程，访问localhost:8769，出现如下界面：

admin 会自己拉取 Eureka 上注册的 app 信息，主动去注册。这也是唯一区别之前入门中手动注册的地方，就是 client 端不需要 admin-client 的依赖，也不需要配置 admin 地址了，一切全部由 admin-server 自己实现。这样的设计对环境变化很友好，不用改了admin-server后去改所有app 的配置了。

四、集成 Spring Security

Web应用程序中的身份验证和授权有多种方法，因此Spring Boot Admin不提供默认方法。默认情况下，spring-boot-admin-server-ui提供登录页面和注销按钮。我们结合 Spring Security 实现需要用户名和密码登录的安全认证。

sc-admin-server工程的pom文件需要增加以下的依赖：

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

在 sc-admin-server工的配置文件 application.yml 中配置 spring security 的用户名和密码，这时需要在服务注册时带上 metadata-map 的信息，如下：

spring:
  security:
    user:
      name: "admin"
      password: "admin"
      
eureka:
  instance:
    metadata-map:
      user.name: ${spring.security.user.name}
      user.password: ${spring.security.user.password}

@EnableWebSecurity注解以及WebSecurityConfigurerAdapter一起配合提供基于web的security。继承了WebSecurityConfigurerAdapter之后，再加上几行代码，我们就能实现要求用户在进入应用的任何URL之前都进行验证的功能，写一个配置类SecuritySecureConfig继承WebSecurityConfigurerAdapter，配置如下：

@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");
        successHandler.setDefaultTargetUrl(adminContextPath + "/");

        http.authorizeRequests()
                //授予对所有静态资产和登录页面的公共访问权限。
                .antMatchers(adminContextPath + "/assets/**").permitAll()
                .antMatchers(adminContextPath + "/login").permitAll()
                //必须对每个其他请求进行身份验证
                .anyRequest().authenticated()
                .and()
                //配置登录和注销
                .formLogin().loginPage(adminContextPath + "/login").successHandler(successHandler).and()
                .logout().logoutUrl(adminContextPath + "/logout").and()
                //启用HTTP-Basic支持。这是Spring Boot Admin Client注册所必需的
                .httpBasic().and();
        // @formatter:on
    }
}

重新访问 http://localhost:8769/ 会出现登录界面，密码是 配置文件中配置好的，账号 admin 密码 admin，界面如下：

五、通知

1. 邮件通知

在 Spring Boot Admin 中 当注册的应用程序状态更改为DOWN、UNKNOWN、OFFLINE 都可以指定触发通知，下面讲解配置邮件通知。

在sc-admin-server工程pom文件，加上mail的依赖，如下：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

在配置文件application.yml文件中，配置收发邮件的配置：

spring:
  mail:
    host: smtp.163.com
    username: xxxx@163.com
    password: xxxx
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
            required: true
  boot:
    admin:
      notify:
        mail:
          from: xxxx@163.com
          to: xxxx@qq.com

配置后，重启sc-admin-server工程，之后若出现注册的客户端的状态从 UP 变为 OFFLINE 或其他状态，服务端就会自动将电子邮件发送到上面配置的收件地址。

注意 : 配置了邮件通知后，会出现 反复通知 service offline / up。这个问题的原因在于 查询应用程序的状态和信息超时，下面给出两种解决方案：

#方法一：增加超时时间（单位:ms）

spring.boot.admin.monitor.read-timeout=20000

#方法二：关闭闭未使用或不重要的检查点

management.health.db.enabled=false
management.health.mail.enabled=false
management.health.redis.enabled=false
management.health.mongo.enabled=false

2. 自定义通知

可以通过添加实现Notifier接口的Spring Beans来添加您自己的通知程序，最好通过扩展 AbstractEventNotifier或AbstractStatusChangeNotifier。在sc-admin-server工程中编写一个自定义的通知器：

@Component
public class CustomNotifier  extends AbstractStatusChangeNotifier {
    private static final Logger LOGGER = LoggerFactory.getLogger( LoggingNotifier.class);

    public CustomNotifier(InstanceRepository repository) {
        super(repository);
    }

    @Override
    protected Mono<Void> doNotify(InstanceEvent event, Instance instance) {
        return Mono.fromRunnable(() -> {
            if (event instanceof InstanceStatusChangedEvent) {
                LOGGER.info("Instance {} ({}) is {}", instance.getRegistration().getName(), event.getInstance(),
                        ((InstanceStatusChangedEvent) event).getStatusInfo().getStatus());

                String status = ((InstanceStatusChangedEvent) event).getStatusInfo().getStatus();

                switch (status) {
                    // 健康检查没通过
                    case "DOWN":
                        System.out.println("发送 健康检查没通过 的通知！");
                        break;
                    // 服务离线
                    case "OFFLINE":
                        System.out.println("发送 服务离线 的通知！");
                        break;
                    //服务上线
                    case "UP":
                        System.out.println("发送 服务上线 的通知！");
                        break;
                    // 服务未知异常
                    case "UNKNOWN":
                        System.out.println("发送 服务未知异常 的通知！");
                        break;
                    default:
                        break;
                }

            } else {
                LOGGER.info("Instance {} ({}) {}", instance.getRegistration().getName(), event.getInstance(),
                        event.getType());
            }
        });
    }
}

源码下载：https://github.com/gf-huanchupk/SpringBootLearning/tree/master/springboot-admin

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