Exam
CKS
Home › CKS practice tasks › Fix a Vulnerable Dockerfile and Deployment Manifest
CKS · Supply Chain Security
Fix a Vulnerable Dockerfile and Deployment Manifest
Analyze and edit the Dockerfile located at /home/candidate/subtle-bee/build/Dockerfile, fixing one instruction present in the file that is a prominent security/best-practice issue.
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The task
Task
Analyze and edit the Dockerfile located at /home/candidate/subtle-bee/build/Dockerfile, fixing one instruction present in the file that is a prominent security/best-practice issue.
> Do not add or remove instructions; only modify the one existing instruction with a security/best-practice concern.
> Do not build the Dockerfile. Failure to do so may result in running out of storage and a zero score.
Analyze and edit the given manifest file /home/candidate/subtle-bee/deployment.yaml, fixing one field present in the file that is a prominent security/best-practice issue.
> Do not add or remove fields; only modify the one existing field with a security/best-practice concern.
> Should you need an unprivileged user for any of the tasks, use user nobody with user ID 65535.
What this tests
Scan images for vulnerabilities, harden Dockerfiles, generate SBOMs, and enforce image policy. On the CKS exam, Supply Chain Security tasks are graded purely on what you build in the cluster - not multiple choice - so the only way to get faster is to do them on a real cluster against a clock.
Practice it for real
prepium.sh drops you into your own isolated Kubernetes cluster in the browser - no install, no credit card. You solve the task in a real terminal, hit validate, and a programmatic checker scores exactly what you got right and wrong (with partial credit). The canonical solution unlocks after you attempt it, so you learn the fast, exam-ready way to do it.