How to find all tags of a Docker image - the skopeo utility

Situation: you urgently need to find the list of available tags for some Docker image. It’s not always convenient to go digging through some web interface for this, be it Docker Hub itself, a GitHub package releases page, a GitLab registry, and so on.

For this purpose there’s a very handy, lightweight console utility called scopeo. It’s available in the standard Debian/Ubuntu repositories, is installed like any other package, and is quite simple to use 🐧.

Below in this how-to I’ll show a few examples of using it 👨‍💻.

skopeo is a command-line utility for working with container images and OCI registries without needing to download images or run Docker.

Installing skopeo on Debian

The skopeo utility is available in the standard repositories:

sudo apt update && sudo apt install -y skopeo

skopeo --version

Main skopeo commands

Viewing an image’s tags:

skopeo list-tags docker://docker.io/library/nginx

Examples:

skopeo list-tags docker://docker.io/rustfs/rustfs

skopeo list-tags docker://quay.io/hedgedoc/hedgedoc

skopeo list-tags docker://codeberg.org/forgejo/forgejo

skopeo list-tags docker://docker.angie.software/angie

Information about an image:

skopeo inspect docker://docker.io/library/nginx:latest

Getting an image’s digest:

skopeo inspect docker://docker.io/library/nginx:latest | jq -r .Digest

Copying an image between registries:

skopeo copy docker://docker.io/library/nginx:latest docker://registry.example.com/nginx:latest

Copying an image to an OCI layout:

skopeo copy docker://docker.io/library/nginx:latest oci:./nginx:latest

Copying an image to a Docker archive:

skopeo copy docker://docker.io/library/nginx:latest docker-archive:nginx.tar

Logging in to an image registry:

skopeo login registry.example.com

Logging out of a registry:

skopeo logout registry.example.com

Verbose output via debug:

skopeo --debug inspect docker://docker.io/library/nginx

Have a great day!

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That should be it. If not, check the logs 🙂