KCNA Cloud Native Application Delivery Practice Question
A team uses Helm to manage a complex application. They want to perform a release upgrade but keep a record of the previous release so they can roll back if needed. Which Helm command should they use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
helm upgrade --history-max 5
The 'helm upgrade' command with the '--history-max' flag sets the maximum number of release versions to retain. Without this flag, old versions are kept by default, allowing rollback. Alternatively, 'helm upgrade' alone maintains history; 'helm rollback' is used later. But the question asks which command to use for the upgrade while keeping history. 'helm upgrade' naturally keeps history unless '--history-max' is set to 0.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
helm delete --purge
Why it's wrong here
This deletes the release and its history, preventing rollback.
- ✓
helm upgrade --history-max 5
Why this is correct
This upgrades the release and keeps the last 5 revisions, allowing rollback. It retains history.
- ✗
helm rollback
Why it's wrong here
helm rollback is used to revert to a previous revision, not to perform an upgrade.
- ✗
helm install
Why it's wrong here
helm install is for initial deployment, not upgrades.
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