You want to create a Helm chart template that sets the container port only if service.port is defined in values.yaml. Which template snippet correctly implements this conditional logic?

hard📝 Best Practice Q15 of 15

Kubernetes - Helm Package Manager

You want to create a Helm chart template that sets the container port only if service.port is defined in values.yaml. Which template snippet correctly implements this conditional logic?

A{{- if .Values.service.port }} containerPort: "{{ .Values.service.port }}" {{- else }} containerPort: 80 {{- end }}

B{{- if .service.port }} containerPort: {{ .service.port }} {{- end }}

C{{- if .Values.service.port }} containerPort: {{ .Values.service.port }} {{- end }}

D{{- if .Values.service.port != null }} containerPort: {{ .Values.service.port }} {{- end }}

Step-by-Step Solution

Solution:

Step 1: Identify correct value reference
Use .Values.service.port to access the port value from values.yaml.
Step 2: Use proper conditional syntax
Helm templates use {{- if .Values.service.port }} to check if the value exists and is non-empty.
Step 3: Evaluate options
{{- if .Values.service.port }} containerPort: {{ .Values.service.port }} {{- end }} correctly uses the conditional and outputs the port only if defined. {{- if .service.port }} containerPort: {{ .service.port }} {{- end }} misses .Values. {{- if .Values.service.port }} containerPort: "{{ .Values.service.port }}" {{- else }} containerPort: 80 {{- end }} adds an else block which is not requested. {{- if .Values.service.port != null }} containerPort: {{ .Values.service.port }} {{- end }} uses invalid syntax (!= null is not valid in Helm templates).
Final Answer:
{{- if .Values.service.port }} containerPort: {{ .Values.service.port }} {{- end }} -> Option C
Quick Check:
Use if .Values.key for conditionals [OK]

Quick Trick: Check existence with if .Values.key, no need for != null [OK]

Common Mistakes:

Omitting .Values prefix
Using invalid comparison operators
Adding unnecessary else blocks

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You want to create a Helm chart template that sets the container port only if service.port is defined in values.yaml. Which template snippet correctly implements this conditional logic?

Step 1: Identify correct value reference

Step 2: Use proper conditional syntax

Step 3: Evaluate options

Final Answer:

Quick Check:

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