What are Helm hooks and how do they work?

What are Helm hooks and how do they work?

Helm hooks are scripts that run at certain points in the release lifecycle of a Helm chart. They allow you to perform actions like running database migrations or sending notifications.

Can you give me an example of a Helm hook?

Sure! A common example is the pre-install hook, which runs before a chart is installed. You might use it to set up prerequisites.

How do I define a hook in my Helm chart?

You define a hook in your chart by adding an annotation to your Kubernetes resource. For example, you can add helm.sh/hook: pre-install to a Job resource.

Are there any best practices for using Helm hooks?

Yes, it's best to keep hooks idempotent, ensure they handle failures gracefully, and document their purpose clearly.