Cloud / HELM Interview Questions
How do you write Helm tests and integrate them into CI/CD pipelines?
Helm tests are pod definitions that run custom validation after a release is installed. They are defined in the templates/tests/ directory (must start with test- prefix).
Example test definition (test-connection.yaml):
apiVersion: v1
kind: Pod
metadata:
name: "{{ .Release.Name }}-test-connection"
annotations:
"helm.sh/hook": test
spec:
containers:
- name: test
image: curlimages/curl
command: ["sh", "-c"]
args:
- "curl -f http://{{ .Release.Name }}/health && echo 'Test passed' && exit 0"
restartPolicy: Never
Running tests: helm test RELEASE_NAME executes all test pods and collects results. Test passes if pod exits with code 0, fails on any other exit code.
CI/CD integration patterns:
- ArgoCD:
helm test my-release --logsin post-deployment hooks - GitLab CI:
helm upgrade --install ... && helm test my-release - Jenkins: Parallel test execution across multiple releases
- GitHub Actions:
timeout 5m helm test my-release || exit 1
Test templates access the same .Values and .Release objects as regular templates. Common tests include connectivity checks, data validation, schema verification, and smoke tests.
Best practice: Keep tests idempotent and fast (<30 seconds). Use --timeout flag to prevent hanging tests.
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