Demystifying Kubernetes `controller-runtime`
If you’re like me and just starting your Kubernetes journey, you’ll likely need to write an Operator to manage your custom resources. Kubernetes offers a high-level Go framework called controller-runtime for building such operators; frameworks like Kubebuilder are built on top of it. What do I mean by custom resources? Well, anything that you would create which is not part of the Kubernetes well-known built-in resources - Pods, Deployments, ReplicaSets, etc. An example might be you adding a new custom Backup resource whose main purpose is to do a scheduled cron job to upload backups to a desired target storage solution. ...