Download a Docker image to file to use on disconnected container host

Q. How can I download an image from Docker to a container host without Internet connectivity?

A. Normally images can be pulled directly from repositories such as Docker Hub however if a machine does not have Internet connectivity and the repository is not on-premises than it will not be possible to download images. An alternate approach is to download the images from a machine that has internet connectivity, save the image to a file, copy to the container host then import.

To save a downloaded image (assuming pulled already using docker pull) to file use:

docker save -o .docker :

Then once copied to the target container host (could use Copy-Item to a session via -ToSession) to import use

docker load -i .docker

Then check it is shown (docker images).

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