GITHUB-1124: Add Support for Configuring Custom Cluster Domain in Helm Chart for Splunk Operator

[vivekr-splunk]

Description:

This PR introduces the ability to configure a custom cluster domain for the Splunk Operator through the Helm chart. Previously, configuring a custom cluster domain was only supported through manifest installation. This enhancement aligns the Helm chart with the manifest-based configuration, allowing users to specify a custom domain directly in the Helm chart's values.yaml file.

Changes Made:

1. Helm Values File:

   • Added a new entry clusterDomain to the values.yaml file.

     # values.yaml
     clusterDomain: "mydomain.com"

2. Helm Chart Templates:

   • Updated the deployment template to inject the CLUSTER_DOMAIN environment variable based on the clusterDomain value from values.yaml.

     # deployment.yaml
     spec:
     containers:
     - name: splunk-operator
     env:
     - name: CLUSTER_DOMAIN
      value: "{{ .Values.clusterDomain | default "cluster.local" }}"

Implementation Details:

• Default Behavior: If no custom domain is specified, the Helm chart defaults to cluster.local for FQDN calculations.
• Custom Domain: Users can now set a custom domain by specifying the clusterDomain value in the values.yaml file.

Testing:

• Verified that the CLUSTER_DOMAIN environment variable is correctly set in the deployment spec when deploying the Splunk Operator using Helm.
• Ensured backward compatibility with existing deployments that do not specify a custom domain.

Related Issues:

• Related to GITHUB-1124
• Related to CSPL-2820

Notes:

• Please ensure that the Helm chart is tested in your environment to confirm that the custom domain configuration is applied correctly.