Which of the following is the correct syntax to add a health check in a Dockerfile for a Spring Boot app that exposes /actuator/health on port 8080?

easy📝 Syntax Q12 of 15

Spring Boot - Docker and Deployment

Which of the following is the correct syntax to add a health check in a Dockerfile for a Spring Boot app that exposes /actuator/health on port 8080?

AHEALTHCHECK RUN curl http://localhost:8080/actuator/health

BHEALTHCHECK CMD curl --fail http://localhost:8080/actuator/health || exit 1

CHEALTHCHECK CMD ping localhost:8080/actuator/health

DHEALTHCHECK EXEC curl http://localhost:8080/actuator/health

Step-by-Step Solution

Solution:

Step 1: Identify correct HEALTHCHECK syntax
The HEALTHCHECK instruction uses CMD followed by a command that returns 0 on success or non-zero on failure.
Step 2: Verify the command tests the health endpoint properly
Using curl with --fail returns error if the endpoint is unhealthy, triggering Docker restart.
Final Answer:
HEALTHCHECK CMD curl --fail http://localhost:8080/actuator/health || exit 1 -> Option B
Quick Check:
HEALTHCHECK CMD + curl --fail = correct syntax [OK]

Quick Trick: Use HEALTHCHECK CMD with curl --fail for health endpoint [OK]

Common Mistakes:

Using RUN instead of CMD in HEALTHCHECK
Using ping instead of curl for HTTP check
Using EXEC keyword which is invalid

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More Spring Boot Quizzes

Which of the following is the correct syntax to add a health check in a Dockerfile for a Spring Boot app that exposes /actuator/health on port 8080?

Step 1: Identify correct HEALTHCHECK syntax

Step 2: Verify the command tests the health endpoint properly

Final Answer:

Quick Check:

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