How to run a script before helm install?

@mac 

To run a script before Helm install, you can modify the Helm chart templates and add pre-install hooks. Here are the steps to achieve this:

1. Open the Helm chart template file. Typically, the template file is named templates/deployment.yaml or templates/your-chart-name.yaml.
2. Add a pre-install hook to the template. A pre-install hook is a Kubernetes Job resource that is executed before the main installation process. Here's an example of how to add a pre-install hook:

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apiVersion: batch/v1
kind: Job
metadata:
  name: pre-install-job
  annotations:
    "helm.sh/hook": pre-install
spec:
  template:
    spec:
      containers:
      - name: pre-install-script
        image: your-pre-install-image
        command: ["your-script.sh"]
      restartPolicy: OnFailure

In the above example, a Kubernetes Job named pre-install-job is created with a single container. The container runs a script named your-script.sh defined in your own image.

1. Save the modified template and package the Helm chart:

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helm package your-chart-folder/

1. Install the Helm chart using the --dry-run flag to verify the pre-install hook:

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helm install --dry-run your-chart-name your-chart-package.tgz

Make sure to replace your-chart-folder/ with the path to your chart folder, your-chart-name with the appropriate name, and your-chart-package.tgz with the generated package name.

After following these steps, your pre-install script will be executed before the helm install command.