What happens when you run kubectl apply
The Kubernetes API server: the one door of the control plane
In a Kubernetes cluster, every request goes through one door. Your requests go through it. The requests of the cluster's own parts go through it too. What does this door check before it lets your app in?
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Your request waits at the API server. It is not alone: the nodes and the other programs of the control plane send their requests here too. They never send them to each other directly.
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That makes the API server the one door of the control plane, and it does not open for just anyone.
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