Docker - Image Optimization
Which is the correct way to specify a cache mount in a Dockerfile RUN instruction to cache dependencies?
Which is the correct way to specify a cache mount in a Dockerfile RUN instruction to cache dependencies?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct syntax
The correct syntax for cache mounts in Dockerfile RUN commands uses--mount=type=cache.Step 2: Analyze options
RUN --mount=type=cache,target=/root/.cache npm install correctly uses--mount=type=cache,target=.... RUN --cache=type=mount,target=/root/.cache npm install uses an invalid flag--cache=. RUN --mount=cache,target=/root/.cache npm install missestype=keyword. RUN --mount=type=volume,target=/root/.cache npm install usestype=volumewhich is not for build cache.Final Answer:
RUN --mount=type=cache,target=/root/.cache npm install -> Option AQuick Check:
Correct syntax includestype=cache[OK]
Quick Trick: Use --mount=type=cache,target=path for cache mounts [OK]
Common Mistakes:
- Omitting 'type=cache' in the mount option
- Using --cache instead of --mount
- Confusing cache mounts with volume mounts
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