DCA Question #31: Real Exam Question with Answer & Explanation

Question

The output of which command can be used to find the architecture and operating system an image is compatible with?

Options

• Adocker image inspect --filter {{.Architecture}} {{.OS}} ' <image-id>
• Bdocker image ls <image-id>
• Cdocker image inspect --format {{.Architecture}} {{.OS}} ' <image-id>
• Ddocker image info <image-id>

Explanation

To identify an image's architecture and operating system, the docker image inspect command should be used with the --format flag.

Common mistakes.

• A. The --filter flag is used to filter lists of resources, not to format the output of a single resource inspection, and its syntax here is incorrect for output formatting.
• B. The docker image ls command is used to list Docker images but does not provide detailed information like architecture or operating system for a specific image.
• D. The docker image info command provides information about the Docker daemon and its environment, not about a specific Docker image.

Concept tested. Docker image inspection and metadata formatting

Reference. https://docs.docker.com/engine/reference/commandline/image_inspect/

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