GitHub Professional Certificate GitHub Packages and Container Registry

Question 1

What is the base URL for authenticating with the GitHub Container Registry (GHCR)?

Accepted Answer

ghcr.io

Answer

GitHub Container Registry uses ghcr.io as its base URL for authentication and image pulls/pushes.

Question 2

Which command correctly logs Docker into the GitHub Container Registry using a Personal Access Token stored in an environment variable TOKEN?

Accepted Answer

echo $TOKEN | docker login ghcr.io -u USERNAME --password-stdin

Answer

Piping the token via --password-stdin is the recommended secure approach to avoid exposing the token in shell history.

Question 3

What minimum permission scope is required on a Personal Access Token (classic) to publish packages to GitHub Packages?

Accepted Answer

write:packages

Answer

The write:packages scope is required to upload and publish package versions to GitHub Packages.

Question 4

Which package ecosystems does GitHub Packages natively support? (Select the most complete answer)

Accepted Answer

npm, RubyGems, Maven, Gradle, Docker, NuGet, and Swift

Answer

GitHub Packages supports npm, RubyGems, Maven, Gradle, Docker/OCI containers, NuGet, and Swift package registries.

Question 5

How do you tag and push a Docker image to GitHub Container Registry for the user 'octocat' and image 'myapp'?

Accepted Answer

docker tag myapp ghcr.io/octocat/myapp:latest && docker push ghcr.io/octocat/myapp:latest

Answer

You must tag the image with the full ghcr.io path including namespace before pushing with docker push.

GitHub Professional Certificate Practice Test