Content trust and image signing in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Docker Content Trust?

Docker Content Trust is a feature that uses digital signatures to verify the integrity and publisher of Docker images before they are pulled or run.

beginner

How does image signing improve security in Docker?

Image signing ensures that the image you use is exactly what the publisher created, preventing tampering or use of malicious images.

beginner

Which command enables Docker Content Trust for your session?

You enable Docker Content Trust by setting the environment variable: export DOCKER_CONTENT_TRUST=1.

intermediate

What is the role of Notary in Docker Content Trust?

Notary is the tool Docker uses to create and manage trusted collections of signed images, ensuring image authenticity.

beginner

What happens if you try to pull an unsigned image with Docker Content Trust enabled?

Docker will refuse to pull the image and show an error because it cannot verify the image's signature.

What environment variable do you set to enable Docker Content Trust?

A DOCKER_SIGN_IMAGES=yes

B DOCKER_CONTENT_TRUST=1

C CONTENT_TRUST=enabled

D DOCKER_TRUST_ENABLE=true

Setting DOCKER_CONTENT_TRUST=1 enables Docker Content Trust for the session.

What does Docker Content Trust verify before pulling an image?

A Image size

B Image download speed

C Image creation date

D Image signature and publisher

Docker Content Trust verifies the image's digital signature and publisher identity.

Which tool does Docker use to manage image signing keys?

A Kubernetes

B Helm

C Notary

D Docker Compose

Notary manages signing keys and trusted collections for Docker Content Trust.

If Docker Content Trust is enabled, what happens when pulling an unsigned image?

A Docker refuses to pull the image

B Docker pulls a warning but continues

C Image is pulled without verification

D Docker signs the image automatically

Docker refuses to pull unsigned images when Content Trust is enabled.

Why is image signing important in Docker workflows?

A To verify image authenticity and prevent tampering

B To speed up image downloads

C To reduce image size

D To enable multi-platform builds

Image signing ensures the image is authentic and has not been tampered with.

Explain how Docker Content Trust helps secure your container images.

Think about how you can trust the source and content of images before using them.

Describe the steps to enable and use Docker Content Trust when pulling images.

Consider what environment variable you set and what happens during image pull.