[Solved] Which Dockerfile instruction correctly defines a health check that runs every 30 seconds? — Ans: HEALTHCHECK --interval=30s CMD curl -f http://localhost/ || exit 1 | Docker

Docker - Logging and Monitoring

Which Dockerfile instruction correctly defines a health check that runs every 30 seconds?

AHEALTHCHECK CMD --interval=30s curl -f http://localhost/ || exit 1

BHEALTHCHECK CMD curl -f http://localhost/ || exit 1 --interval=30s

CHEALTHCHECK --interval=30s CMD curl -f http://localhost/ || exit 1

DHEALTHCHECK INTERVAL 30 CMD curl -f http://localhost/ || exit 1

Step-by-Step Solution

Solution:

Step 1: Understand HEALTHCHECK syntax
The correct syntax places options like --interval before CMD.
Step 2: Identify correct placement
HEALTHCHECK --interval=30s CMD curl -f http://localhost/ || exit 1 correctly uses --interval=30s before CMD.
Final Answer:
HEALTHCHECK --interval=30s CMD curl -f http://localhost/ || exit 1 -> Option C
Quick Check:
HEALTHCHECK --interval=30s CMD curl -f http://localhost/ || exit 1 syntax matches Dockerfile HEALTHCHECK format [OK]

Quick Trick: Options like --interval go before CMD in HEALTHCHECK [OK]

Common Mistakes:

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Which Dockerfile instruction correctly defines a health check that runs every 30 seconds?