helm upgrade
- Docker & Kubernetes course
- Advanced
- Lesson 11/70
- 4 min
Learn to upgrade a release with helm upgrade.
helm upgrade
helm upgrade moves a release to a new chart version or new values; each upgrade creates a new revision. --install installs the release if it doesn't exist; that's why in CI pipelines upgrade --install is used as a single command:
helm upgrade --install magaza ./magaza -n magaza -f prod-values.yaml --set image.tag=1.4.3 --wait
helm history magaza -n magaza
REVISION STATUS CHART APP VERSION DESCRIPTION
1 superseded magaza-0.1.0 1.4.2 Install complete
2 deployed magaza-0.1.0 1.4.2 Upgrade completeRolling back and uninstalling
If an upgrade causes problems, helm rollback returns the release to an earlier revision. --atomic rolls back a failed upgrade automatically. helm uninstall deletes all of the release's resources (PVCs usually remain):
helm rollback magaza 1 -n magaza
helm upgrade magaza ./magaza --atomic --timeout 5m
helm uninstall magaza -n magazaPractice CI deployment and rollback
Write three commands: upgrade ./magaza as the magaza release in the magaza namespace, installing it if missing, with prod-values.yaml, --set image.tag=1.4.3 and --atomic; show the release history; roll back to revision 1.
Starter code
# buraya yazSample solution
helm upgrade --install magaza ./magaza -n magaza -f prod-values.yaml --set image.tag=1.4.3 --atomic
helm history magaza -n magaza
helm rollback magaza 1 -n magazaExpected output
Release "magaza" has been upgraded. Happy Helming! REVISION STATUS CHART APP VERSION DESCRIPTION 1 superseded magaza-0.1.0 1.4.2 Install complete 2 deployed magaza-0.1.0 1.4.2 Upgrade complete Rollback was a success! Happy Helming!
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 During helm upgrade, what happens to values not given with --set?
- All are kept
- The release is deleted
- It errors
- They return to chart defaults; the previous install's --set values aren't kept by themselves Correct answer
Explanation: --reuse-values keeps the previous values; but keeping all values in a file is safest.
2 Install the release if missing, otherwise upgrade it.
helm upgrade ____ magaza ./magazahelm upgrade --install magaza ./magazaExplanation: upgrade --install is an idempotent deploy command.
3 Match.
| Term | Meaning |
|---|---|
upgrade --install |
Install or upgrade |
helm history |
Revisions |
helm rollback |
Return to an earlier revision |
--atomic |
Roll back on failure |