Which outbound port is used for the Kubernetes HTTPS Kubelet?

The Kubernetes HTTPS Kubelet primarily communicates over port 10250. This specific port is designated for secure communication with the Kubelet, which is the primary node agent that runs on each node within a Kubernetes cluster. The Kubelet is responsible for managing the containers on a node, ensuring that they are running as expected, and reporting the status of those containers back to the Kubernetes control plane.

Port 80 is commonly used for standard HTTP traffic, while port 443 is designated for HTTPS. Port 8080 is often used for alternative web services or APIs but is not the standard port for Kubelet communication. Therefore, 10250 is the port specifically allocated for HTTPS Kubelet interactions, making it the correct choice in this context.