[Solved] You want Docker to check your Spring Boot app health every 30 seconds, retry 3 times before marking unhealthy, and start checking only... Which HEALTHCHECK instruction correctly implements this? | Spring Boot

Spring Boot - Docker and Deployment

You want Docker to check your Spring Boot app health every 30 seconds, retry 3 times before marking unhealthy, and start checking only after 10 seconds of container start. Which HEALTHCHECK instruction correctly implements this?

AHEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 CMD curl --fail http://localhost:8080/actuator/health || exit 1

BHEALTHCHECK --interval=10s --timeout=30s --start-period=3s --retries=5 CMD curl --fail http://localhost:8080/actuator/health || exit 1

CHEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 CMD curl http://localhost:8080/actuator/health || exit 1

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

Step-by-Step Solution

Solution:

Step 1: Match timing parameters to requirements
Interval 30s means check every 30 seconds, start-period 10s delays first check, retries 3 means try 3 times before unhealthy.
Step 2: Verify curl command correctness
curl uses --fail to detect HTTP errors, with exit 1 to signal failure to Docker.
Final Answer:
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 CMD curl --fail http://localhost:8080/actuator/health || exit 1 -> Option A
Quick Check:
Correct timing + curl --fail = HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 CMD curl --fail http://localhost:8080/actuator/health || exit 1 [OK]

Quick Trick: Set interval, retries, start-period explicitly with curl --fail [OK]

Common Mistakes:

Mixing up interval and timeout values
Omitting --fail in curl command
Not setting start-period to delay checks

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Which HEALTHCHECK instruction correctly implements this?

Step 1: Match timing parameters to requirements

Step 2: Verify curl command correctness

Final Answer:

Quick Check:

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