Health checks in Docker in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a simple health check endpoint in Spring Boot.

Spring Boot

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HealthController {
    @GetMapping("/health")
    public String [1]() {
        return "OK";
    }
}

Drag options to blanks, or click blank then click option'

Ahealth

BcheckHealth

ChealthCheck

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated method names that confuse the purpose.

The method name can be anything, but health matches the endpoint and is clear.

2fill in blank

medium

Complete the Dockerfile line to add a health check that calls the Spring Boot health endpoint.

Spring Boot

HEALTHCHECK --interval=30s --timeout=5s CMD curl -f http://localhost:8080/[1] || exit 1

Drag options to blanks, or click blank then click option'

Astatus

Bhealth

Cping

Dcheck

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect endpoint paths that cause health check failures.

The health endpoint is usually /health in Spring Boot apps.

3fill in blank

hard

Fix the error in the Dockerfile health check command to correctly check the Spring Boot app health.

Spring Boot

HEALTHCHECK --interval=30s --timeout=5s CMD curl -f http://localhost:8080/[1] || exit 1

Drag options to blanks, or click blank then click option'

Alive

Bhealthz

Cstatus

Dhealth

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent endpoints causing health check failures.

The correct health endpoint is /health. Others will cause errors.

4fill in blank

hard

Fill both blanks to create a Spring Boot actuator health check configuration and Dockerfile health check command.

Spring Boot

management.endpoint.health.[1]=true
HEALTHCHECK --interval=30s CMD curl -f http://localhost:8080/actuator/[2] || exit 1

Drag options to blanks, or click blank then click option'

Aenabled

Bdisabled

Chealth

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Disabling the endpoint or using wrong endpoint paths.

Enable the health endpoint in Spring Boot actuator with enabled and check /actuator/health in Docker.

5fill in blank

hard

Fill all three blanks to define a custom health indicator bean and use it in the health endpoint.

Spring Boot

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

@Component
public class CustomHealthIndicator implements HealthIndicator {
    @Override
    public Health [1]() {
        boolean serverUp = checkServer();
        if (serverUp) {
            return Health.[2]().withDetail("server", "Up").build();
        } else {
            return Health.[3]().withDetail("server", "Down").build();
        }
    }

    private boolean checkServer() {
        // Custom logic here
        return true;
    }
}

Drag options to blanks, or click blank then click option'

Ahealth

Bup

Cdown

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Wrong method names or using incorrect Health status methods.

The method overriding HealthIndicator is health(). Use Health.up() and Health.down() to indicate status.