Including Large Files in a Helm ConfigMap

In your Kubernetes application using Helm, you’re seeking to add several large files into an external directory as part of your deployment. Here’s how you can include those within your ConfigMap effectively:

1. Structure Your Directories (if not already done): Ensure that the structure looks something like this in .values.yaml:

   my-app/conf/my-large-file1.conf
   my-app/conf/my-large-file2.conf
   

   Make sure your templates directory has a corresponding config map template, such as:

   my-app/templates/configmaps.yaml
   

2. Update Your ConfigMap Template (in the above YAML): To include these large files directly in the ConfigMap data without errors or scope issues try using tpl function to interpolate template:

   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: example-configmap
   data:
     index.html: {{- tpl (.Files.Get "conf/my-large-file1.conf") . | nindent 4 }}
     app_users.properties: {{- tpl (.Files.Get "conf/app-users.properties.tmpl") . | nindent 4 }}
   

   This approach will fetch the file content and include it in your ConfigMap. The | operator pipes output into .nindent(), ensuring consistent indentation for readability without adding additional characters that could cause issues with large files’ line breaks.

3. Check Helm Version: Ensure compatibility of tools used, as version specifics may impact functionality (note in the example provided a v3.11.1+6.el8 environment).

   helm version
   # Output here shows your installed helper's information for verification purposes only – do not include it within markdown content or code blocks directly related to instructions on including files in ConfigMap.
   

4. Apply Your Changes: After making these updates, deploy the changes with Helm by using helm upgrade --recreate. This command ensures that your new deployment will take effect and reflects recent configurations made within .Values or templates like so:

   helm upgrade my-app ./my-chart  # Assuming './my-chart' refers to the chart containing this ConfigMap resource. Replace accordingly with actual parameters of interest, such as release name if different from your directory structure naming convention. Ensure these details are included within markdown content or code examples for clarity but avoid repetition in final article formating:
   ```shell
    helm upgrade --recreate my-app ./my01_configmap # Adjust this command based on actual chart and release names used, ensure proper syntax without redundancy. 
   

By using the tpl function correctly within your Helm Chart’s template files for ConfigMaps, you can include large external configuration files seamlessly as part of a Kubernetes deployment orchestrated by Helm.