[Solved] Which Dockerfile instruction helps reduce image size by cleaning up after package installation? — Ans: RUN apt-get update && apt-get install -y package && rm -rf /var/lib/apt/lists/* | Docker

Docker - Image Optimization

Which Dockerfile instruction helps reduce image size by cleaning up after package installation?

ACMD ["python", "app.py"]

BRUN apt-get update && apt-get install -y package && rm -rf /var/lib/apt/lists/*

CEXPOSE 80

DCOPY . /app

Step-by-Step Solution

Solution:

Step 1: Identify cleanup commands in RUN instruction
The command removes package cache files after installation to reduce image size.
Step 2: Recognize other instructions do not clean up
COPY, EXPOSE, and CMD do not affect image size cleanup.
Final Answer:
RUN apt-get update && apt-get install -y package && rm -rf /var/lib/apt/lists/* -> Option B
Quick Check:
Cleanup after install = RUN with rm command [OK]

Quick Trick: Clean package cache in same RUN to reduce image size [OK]

Common Mistakes:

Master "Image Optimization" in Docker

9 interactive learning modes - each teaches the same concept differently

More Docker Quizzes

Which Dockerfile instruction helps reduce image size by cleaning up after package installation?