详解spring-boot actuator（监控）配置和使用

在生产环境中，需要实时或定期监控服务的可用性。spring-boot 的actuator（监控）功能提供了很多监控所需的接口。简单的配置和使用如下：

1、引入依赖：

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

如果使用http调用的方式，还需要这个依赖：

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

2、配置：

application.yml中指定监控的HTTP端口（如果不指定，则使用和server相同的端口）；指定去掉某项的检查（比如不监控health.mail）：

server:
 port: 8082
management:
 port: 54001
 health:
  mail:
   enabled: false 

3、使用：

查看health指标：http://localhost:54001/health

{"status":"UP","diskSpace":{"status":"UP","total":120031539200,"free":33554337792,"threshold":10485760},"db":{"status":"UP","dataSource1":{"status":"UP","database":"MySQL","hello":1},"dataSource2":{"status":"UP","database":"MySQL","hello":1}}} 

4、自定义指标：

4.1 /health：在某个类中implements HealthIndicator接口，然后实现其中的health()方法即可：

代码：

@SpringBootApplication
@EnableScheduling
public class MySpringBootApplication implements HealthIndicator{
  private static Logger logger = LoggerFactory.getLogger(MySpringBootApplication.class); 

  public static void main(String[] args) {
    SpringApplication.run(MySpringBootApplication.class, args);
    logger.info("My Spring Boot Application Started");
  } 

  /**
   * 在/health接口调用的时候，返回多一个属性："mySpringBootApplication":{"status":"UP","hello":"world"}
   */
  @Override
  public Health health() {
    return Health.up().withDetail("hello", "world").build();
  }
}

/health 运行结果（注意第二个指标）：

{"status":"UP","mySpringBootApplication":{"status":"UP","hello":"world"},"diskSpace":{"status":"UP","total":120031539200,"free":33554337792,"threshold":10485760},"db":{"status":"UP","dataSource1":{"status":"UP","database":"MySQL","hello":1},"dataSource2":{"status":"UP","database":"MySQL","hello":1}}}

4.2 /info：配置如下，可以直接给一个字符串，也可以从pom.xml配置中获取

info:
 app:
  name: "@project.name@" #从pom.xml中获取
  description: "@project.description@"
  version: "@project.version@"
  spring-boot-version: "@project.parent.version@"

/info的结果如下：

{"app":{"name":"my-spring-boot","description":"Test Project for Spring Boot","version":"1.0","spring-boot-version":"1.3.6.RELEASE"}}

官网：http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#production-ready

源代码参考：https://github.com/xujijun/my-spring-boot

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