Learn the correct command to publish the latest version of a Docker image to GitHub Container Registry (GHCR) using GitHub Actions. Boost your GitHub Actions skills with this quick tip.
Table of Contents
Question
Which action do you use to publish the latest version of a Docker image to GitHub Container Registry?
A. docker push ghcr.io/OWNER/IMAGE_NAME
B. docker push ghcr.io/OWNER/IMAGE_NAME:latest
C. docker push latest ghcr.io/OWNER/IMAGE_NAME
Answer
B. docker push ghcr.io/OWNER/IMAGE_NAME:latest
Explanation
This is the correct command to push the latest Docker image.
To publish the latest version of a Docker image to GitHub Container Registry (GHCR) using GitHub Actions, the correct command is:
B. docker push ghcr.io/OWNER/IMAGE_NAME:latest
When pushing a Docker image to GHCR, you need to specify the complete image name, including the registry URL (ghcr.io), the owner or organization name (OWNER), the image name (IMAGE_NAME), and optionally, the image tag (latest in this case).
The format for the Docker push command is:
docker push [REGISTRY_URL]/[OWNER]/[IMAGE_NAME]:[TAG]
In the given options:
A. docker push ghcr.io/OWNER/IMAGE_NAME
This command is missing the image tag. While it may work, it doesn’t explicitly specify that you want to push the “latest” version of the image.
B. docker push ghcr.io/OWNER/IMAGE_NAME:latest
This is the correct command. It includes the registry URL, owner, image name, and the “latest” tag, ensuring that the most recent version of the image is pushed to GHCR.
C. docker push latest ghcr.io/OWNER/IMAGE_NAME
This command has an incorrect syntax. The image tag (latest) should be specified after the image name, not before the registry URL.
Therefore, the correct action to publish the latest version of a Docker image to GitHub Container Registry is:
docker push ghcr.io/OWNER/IMAGE_NAME:latest
Remember to replace OWNER and IMAGE_NAME with your actual GitHub username or organization and the desired name for your Docker image.
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