My NAS is a walled-off system without SSH or terminal access, and it only lets me import local .tar container images. I need an image hosted in a GitHub container registry. Is there a way to download or generate a Docker-compatible .tar file from the image link without running Docker on the NAS itself?
3 Answers
The simplest approach is to use another computer that has network access and Docker. Pull the image there, export it with `docker save -o image.tar image-name:tag`, transfer the TAR file to the NAS, and import it with the NAS’s image-upload feature. This works well for isolated or air-gapped systems.
You do not necessarily need Docker. Tools such as Skopeo or Crane can copy an image from a registry directly into a Docker-compatible archive. For example, Skopeo can use a command like `skopeo copy docker://ghcr.io/owner/image:tag docker-archive:image.tar:image:tag`. Private images may also require registry credentials.
A registry image is made up of multiple layers and metadata, so downloading the visible link with a normal browser or basic `curl` usually will not produce a usable TAR by itself. A registry-aware tool such as Skopeo, Crane, or a temporary Docker installation is the safer option.
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