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March 18, 2026
The Kubernetes API uses optimistic concurrency control. If you don’t understand resourceVersion, your controller will fight itself.
February 10, 2026
The controller-runtime cache can list resources by namespace and name. Custom indices let you query by any field.
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January 14, 2026
You run two replicas of your controller for availability. Without leader election, both try to reconcile the same resources at the same time.
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December 1, 2025
Deletion in Kubernetes is instant — unless a finalizer says otherwise. Here’s how to run cleanup logic before a resource disappears.
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October 7, 2025
Your controller creates a Deployment. The Deployment changes. How does your controller find out? Owner references and secondary watches.
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September 22, 2025
Spec is what the user wants. Status is what the controller observes. Keeping them separate is how you avoid infinite reconcile loops.
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