Spring Boot Admin用於管理和監控Spring Boot程式，Spring Boot Admin 作為 Server 端，其他的要被監控的應用作為 Client 端。前面幾篇文章搭建的model如service-feign，service-ribbon，eureka-client之類的都可以是被監控的Client端。

一、搭建Admin Server服務端

新建model：admin-server
pom.xml

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

應用主類添加註解並新增配置(這個配置來資源官方文件推薦)：

@SpringBootApplication
@EnableAdminServer
@EnableEurekaClient
public class AdminServerApplication {

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

    @Profile("insecure")
    @Configuration
    public static class SecurityPermitAllConfig extends WebSecurityConfigurerAdapter {
        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http.authorizeRequests().anyRequest().permitAll()//
                    .and().csrf().disable();
        }
    }

    @Profile("secure")
    @Configuration
    public static 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();
            // @formatter:on
        }
    }
}

可以看出是兩種選項，是否需要secure安全保護。可以再配置檔案裡選擇啟用哪種配置。
application.yml

spring:
  application:
    name: admin-server
  profiles:
    active:
      - secure
server:
  port: 9997

# tag::configuration-eureka[]
eureka:   #<1>
  instance:
    leaseRenewalIntervalInSeconds: 10
    health-check-url-path: /actuator/health
  client:
    registryFetchIntervalSeconds: 5
    serviceUrl:
      defaultZone: ${EUREKA_SERVICE_URL:http://localhost:7777}/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"  #<2>
  endpoint:
    health:
      show-details: ALWAYS
# end::configuration-eureka[]

---
spring:
  profiles: insecure

---
spring:
  profiles: secure
  security:
    user:
      name: "user"
      password: "password"
eureka:
  instance:
    metadata-map:
      user.name: "user"         #These two are needed so that the server
      user.password: "password" #can access the protected client endpoints

二、修改客戶端

在原來service-feign，service-ribbon，eureka-client三個model的基礎上修改其依賴和配置，新增依賴：

<dependency>
   <groupId>de.codecentric</groupId>
    <artifactId>spring-boot-admin-starter-client</artifactId>
    <version>2.0.1</version>
</dependency>

配置檔案新增配置：

spring:
    boot:
      admin:
        client:
          url: "http://localhost:9997"
management:
  endpoints:
    web:
      exposure:
        include: '*'
  endpoint:
      health:
        show-details: ALWAYS

Spring Boot 2.0 的 Actuator 只暴露了 /health、/info 兩個埠（為了安全考慮），所以要配置 management.endpoints.web.exposure.include 的屬性。

三、測試

啟動eureka-server，admin-server，eureka-client，service-feign，service-ribbon
訪問：http://localhost:9997，輸入配置好的使用者名稱和密碼

原始碼