Docker - Security
What will happen if you run
docker pull alpine with DOCKER_CONTENT_TRUST=1 set but the image is unsigned?What will happen if you run docker pull alpine with DOCKER_CONTENT_TRUST=1 set but the image is unsigned?
medium📝 Command Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Understand content trust behavior on unsigned images
When content trust is enabled, Docker requires a valid signature to pull an image.Step 2: Identify expected Docker response
If the image is unsigned, Docker refuses to pull it and shows an error to prevent unverified usage.Final Answer:
Docker will refuse to pull the image and show an error -> Option DQuick Check:
Content trust blocks unsigned image pulls [OK]
Quick Trick: Content trust blocks unsigned images from pulling [OK]
Common Mistakes:
- Thinking Docker pulls unsigned images anyway
- Assuming Docker signs images automatically
- Believing Docker only warns but allows pull
Master "Security" in Docker
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