Which Podman command saves an image to a tar file using an optional output file name?

Which Podman command saves an image to a tar file using an optional output file name?

• A. sudo podman save -o FILE_NAME IMAGE_NAME[:TAG]
• B. sudo podman export -o FILE_NAME IMAGE_NAME
• C. sudo podman save IMAGE_NAME[:TAG] -o FILE_NAME
• D. sudo podman save -i FILE_NAME

Answer: (A)

Saving an image to a tar file in Podman is done with the save subcommand and the -o option to specify the output file. The -o FILE_NAME flag tells Podman exactly where to write the tarball, and the image name (with an optional tag) tells Podman which image to archive. So the proper form is to place -o FILE_NAME right after save, followed by IMAGE_NAME[:TAG]. This produces a tarball named FILE_NAME containing the specified image (including its layers and manifest). Why the other forms aren’t correct: using export is for saving the filesystem of a container, not an image, so it doesn’t save an image as a tar that you can load back with podman load. Placing the output option after the image can be less conventional or unsupported in some versions, whereas the documented usage places -o before the image to clearly associate the output with the archive you’re creating.

Saving an image to a tar file in Podman is done with the save subcommand and the -o option to specify the output file. The -o FILE_NAME flag tells Podman exactly where to write the tarball, and the image name (with an optional tag) tells Podman which image to archive. So the proper form is to place -o FILE_NAME right after save, followed by IMAGE_NAME[:TAG]. This produces a tarball named FILE_NAME containing the specified image (including its layers and manifest).

Why the other forms aren’t correct: using export is for saving the filesystem of a container, not an image, so it doesn’t save an image as a tar that you can load back with podman load. Placing the output option after the image can be less conventional or unsupported in some versions, whereas the documented usage places -o before the image to clearly associate the output with the archive you’re creating.