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Asked: 2024-09-22T03:07:18+05:30 In:

How can I concatenate two variables in a Helm template with a string in between them? I’m looking for an example of how to achieve this in my Kubernetes configuration files.

Hey everyone! I’m diving into Helm templates for my Kubernetes configuration and I’ve hit a bit of a snag. I need to concatenate two variables with a specific string in between them, but I’m not quite sure how to go about it in my template.

For example, I have two variables: `varA` and `varB`, and I want to combine them into a single string formatted like this: `”varA – varB”`.

Could someone please show me how I can achieve this in my Helm templates? Any pointers or examples would be super helpful! Thanks in advance!

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    3 Answers






    1. Helm Template Help

      Helm Template Concatenation

      Hi there!

      You’re definitely not alone; many people run into this when they’re getting started with Helm templates. Concatenating variables in a Helm template is pretty straightforward using the printf function. You can create the desired output format by doing something like this:

      {{ printf "%s - %s" .Values.varA .Values.varB }}

      In this example:

      • printf is used to format the string.
      • %s is a placeholder for the string values of varA and varB.
      • You access the values from your values.yaml file using .Values.

      This will give you the output in the desired format “varA – varB”. Just make sure varA and varB are defined in your values.yaml.

      If you have any more questions or need further clarification, feel free to ask!



    2. Concatenating Variables in Helm Templates

      Hey there! No worries, I can help you with that!

      In Helm templates, you can concatenate strings using the printf function. Here’s how you can format your variables varA and varB with a hyphen in between:

      {{- $varA := "ValueA" -}}
{{- $varB := "ValueB" -}}
{{- $result := printf "%s - %s" $varA $varB -}}
{{- $result -}}

      In this example:

      • {{- $varA := "ValueA" -}} sets varA.
      • {{- $varB := "ValueB" -}} sets varB.
      • {{- $result := printf "%s - %s" $varA $varB -}} combines the two variables with a hyphen.
      • {{- $result -}} outputs the final result.

      Just replace "ValueA" and "ValueB" with your actual variables. This will give you the string formatted as "varA - varB". Hope this helps!



    3. To concatenate two variables in Helm templates, you can utilize the built-in `printf` function, which allows you to format strings easily. Given your requirement to format `varA` and `varB` into the string “varA – varB”, you can do this with the following line in your Helm template: {{ printf "%s - %s" .Values.varA .Values.varB }}. This uses the `printf` function to format the output, where “%s” serves as a placeholder for each variable. Make sure that `varA` and `varB` are defined in your values.yaml file or passed during the Helm install/upgrade command.

      Here’s a simplified example of how you might structure your Helm template. Assuming you have the following variables defined in your values file:

      varA: "ValueA"
varB: "ValueB"

      In your template file (e.g., templates/my-template.yaml), you would include the concatenation like this:

      message: {{ printf "%s - %s" .Values.varA .Values.varB }}

      This will render the output as ValueA - ValueB when you deploy your Helm chart. It’s a concise and effective way to format strings using Helm’s templating functionalities.


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