Certified Kubernetes Administrator (CKA) Practice Test

When you specify `nodeName` for a pod, the pod will bypass the normal scheduling process and be directly assigned to the specific node indicated by the `nodeName`. This means that instead of the Kubernetes scheduler evaluating which node is best suited for the pod based on resource availability, node selectors, affinity/anti-affinity rules, and other scheduling criteria, the pod will be scheduled exclusively to the specified node.

This capability can be particularly useful in scenarios where a pod requires specific resources or configurations available only on a particular node. For example, you may have specialized hardware or software that only runs on that node, and by setting the `nodeName`, you ensure that the pod lands on that node regardless of the resource availability on other nodes in the cluster.

In contrast, specifying `nodeName` does not ensure that a pod will run on the control plane node only; this would depend on your cluster setup and is not a requirement of the `nodeName` functionality. Additionally, the pod will not be deleted immediately upon setting the `nodeName`, nor will it be scheduled based solely on available resources, as these actions are contrary to the behavior defined for using `nodeName`.