Skill Path (Easy, Medium)

Copy Container Images Like a Pro

Copying a container image from one repository to another is a common DevOps task. Sometimes, it's necessary because the image is changing homes; other times, it's motivated by Docker Hub's aggressive rate limiting; and often, it's simply a matter of "mirroring" public images using the company's internal registry.

In simpler cases, this task can be accomplished with the classic docker pull + docker tag + docker push combo. In more complex scenarios, using specialized tools like crane, skopeo, or regctl may be more efficient. And for copying multi-platform images, understanding remote image composition is essential to getting the job done correctly.

This skill path starts with the basic single-platform/single-tag image copy case and gradually introduces more complex scenarios, such as multi-platform images and copying all image tags from one repository to another.

Have fun!

Container image name format visualized: registry domain, repository path, tag, and digest.

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How to Author Skill paths on iximiuz Labs

Instead of providing a subpar online editing experience, iximiuz Labs offers a helper CLI tool called labctl, allowing you to use your favorite text editor (or a full-featured IDE) to write content from the comfort of your local machine.

Install labctl CLI

curl -sf https://labs.iximiuz.com/cli/install.sh | sh

This will download and install the latest version of the labctl CLI. You only need to do this once per workstation.

Authorize labctl

labctl auth login

This will open a browser window asking you to authorize labctl to access your account. You need to do it after a fresh install of labctl and repeat it whenever the auth session expires.

Pull skill path content

labctl content pull skill-path copy-container-images

This will create a local copy of the skill path content in a directory named copy-container-images. You only need to do this once per skill path.

Stream your changes

labctl content push -fw skill-path copy-container-images

Run this command in a separate terminal to continuously upload your changes to the server while editing the skill path in your favorite text editor or IDE.

You can also use labctl to create, list, and delete your content. Learn more about the available commands: labctl content --help