Spring Boot 4 Complete Guide · 강의

Spring Boot Actuator를 활용한 모니터링

Spring Boot Actuator 엔드포인트를 활용해 운영 환경에서 애플리케이션을 모니터링하고 관리하며 검사합니다.

Spring Boot Actuator를 활용한 모니터링은(는) CoddyKit의 무료 Spring Boot 4 Complete Guide 강의입니다. 이것은 4개 중 2번째 강의입니다. 아래에서 전체 강의를 무료로 읽을 수 있으며, 내장 코드 에디터와 24/7 AI 튜터와 함께 브라우저에서 직접 실습할 수 있습니다. 이 강의는 Spring Boot 4 Complete Guide 학습 경로의 일부이며, 진행 상황이 웹과 CoddyKit 앱에 동기화됩니다. Spring Boot 4 Complete Guide 강의에는 총 4개의 강의가 포함되어 있습니다.

이 강의의 일부는 아직 번역되지 않았으며 영어로 표시됩니다.

Meet Spring Boot Actuator

Spring Boot Actuator is a powerful tool that helps you monitor and manage your application when it's running in production. Think of it as your app's built-in dashboard!

It provides production-ready features without requiring you to write much code.

Monitoring: Check health, metrics, and environment details.
Management: Log levels, shutdown, refresh context.
Insight: Understand your app's internal workings.

Include Actuator in Your Project

To use Actuator, you just need to add its starter dependency to your project. This brings in all the necessary libraries.

For Maven, add this to your pom.xml:

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

Discover Actuator's Endpoints

Once Actuator is added, your application automatically exposes several "endpoints". These are HTTP URLs that provide specific information about your running app.

Some default endpoints include:

/actuator/health: Shows application health status.
/actuator/info: Displays general application information.
/actuator/metrics: Provides detailed metrics (CPU, memory, etc.).

By default, only /health and /info are exposed via web.

Run & Access Actuator

Let's create a simple Spring Boot app with Actuator. After running it, you can access the default endpoints in your browser or with a tool like curl.

Try running this and then navigate to http://localhost:8080/actuator/health.

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

Deep Dive: The /health Endpoint

The /actuator/health endpoint is crucial for understanding your application's operational status. It aggregates information from various "health indicators".

DiskSpace: Checks available disk space.
DataSource: Verifies database connectivity (if configured).
Liveness/Readiness: For Kubernetes deployments (newer versions).

It typically returns {"status": "UP"} if everything is fine, or details if something is down.

Custom Info with /info

The /actuator/info endpoint provides general information about your application. By default, it's empty, but you can easily populate it with useful details.

Add custom properties to your application.properties or application.yml:

info.app.name=MyActuatorApp
info.app.version=1.0.0
info.app.description=A demo for CoddyKit

Configure & Expose More Endpoints

By default, only /health and /info are exposed over the web. You can expose more endpoints like /beans (list all Spring beans) or /env (environment properties).

To expose all endpoints, add this to application.properties:

management.endpoints.web.exposure.include=*

Monitor Performance with /metrics

The /actuator/metrics endpoint is invaluable for performance monitoring. It exposes various metrics about your application, JVM, and system.

Examples of metrics:

jvm.memory.used: Current JVM memory usage.
system.cpu.usage: System CPU load.
http.server.requests: Details about incoming HTTP requests.

You can query specific metrics like /actuator/metrics/jvm.memory.used for detailed data.

Build Your Own Health Checks

You can create custom health indicators to check the status of specific parts of your application, like an external service dependency or a custom cache.

Implement the HealthIndicator interface:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Component;

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

@Component
class MyCustomHealthIndicator implements HealthIndicator {

    @Override
    public Health health() {
        // Simulate checking an external service
        boolean serviceIsUp = Math.random() > 0.5; // Randomly up or down
        if (serviceIsUp) {
            return Health.up().withDetail("myServiceStatus", "OK").build();
        } else {
            return Health.down().withDetail("myServiceStatus", "Failed").build();
        }
    }
}

Quick Check: Actuator Endpoints

Which of the following Actuator endpoints are exposed by default over the web in a basic Spring Boot application with the Actuator dependency?

Actuator: Your App's Best Friend

Congratulations! You've learned how Spring Boot Actuator transforms your application into a production-ready, observable service.

It provides crucial insights into your app's health and performance.
You can easily add it with a single dependency.
Default endpoints like /health and /info are automatically available.
You can expose more endpoints and even create custom health checks.

Actuator is a must-have for any serious Spring Boot application!

자주 묻는 질문

“Spring Boot Actuator를 활용한 모니터링” 강의는 무료인가요?

네 — “Spring Boot Actuator를 활용한 모니터링” 전체 내용을 이 웹사이트에서 무료로 읽을 수 있습니다. 인터랙티브하게 실습하려면(내장 코드 에디터와 24/7 AI 튜터), CoddyKit PRO로 업그레이드하면 Spring Boot 4 Complete Guide 강의 전체를 잠금 해제할 수 있습니다. Spring Boot 4 Complete Guide 강의에는 총 4개의 강의가 포함되어 있습니다.

“Spring Boot Actuator를 활용한 모니터링”에서 뭘 배우나요?

Spring Boot Actuator 엔드포인트를 활용해 운영 환경에서 애플리케이션을 모니터링하고 관리하며 검사합니다. 브라우저에서 직접 실행하는 실습 코드로 Spring Boot 4 Complete Guide을(를) 배우며, 24/7 AI 튜터가 강의를 진행하면서 질문에 답변해줍니다.

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사전 경험은 필요하지 않습니다. CoddyKit의 Spring Boot 4 Complete Guide은(는) 초급자부터 고급 학습자까지를 위해 구성되어 있으므로, 여기서 시작하거나 처음부터 시작할 수 있으며 자신의 속도대로 진행할 수 있습니다. 이것은 4개 중 2번째 강의입니다.

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대부분의 CoddyKit 강의는 약 5~10분이 소요됩니다. 각 강의는 간결하고 인터랙티브하여 꾸준한 진행이 가능하며, 웹과 앱에서 중단한 부분부터 바로 시작할 수 있습니다.

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