Should I write ReplicaSet YAML files for my applications?

Actually, no! In modern Kubernetes, you almost never create a ReplicaSet directly. Instead, you create a `Deployment` object. The Deployment manages the ReplicaSet for you, adding the ability to perform zero-downtime rolling updates.

What happens if I manually create a Pod with the label `app: frontend` while a ReplicaSet is also managing that label?

If the ReplicaSet expects 3 pods and you manually create a 4th with a matching label, the ReplicaSet will instantly detect that there are 4 pods instead of 3, and it will immediately terminate one of them to restore the desired state.

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ReplicaSets and Self-Healing

Explore the ReplicaSet controller. Understand the reconciliation loop, how Label Selectors bind controllers to Pods, and how to scale infrastructure both declaratively and imperatively.

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