<p>I have by mistake added a pod in the system namespace "kube-system". And then I am unable to remove this pod. It also seems to have created a replica set. Every time delete these items, they are recreated. </p>

<p>Can't seem to find a way to delete pods or replica sets belonging to the system namespace "kube-system"</p>

<p>If you created the pod using <code>kubectl run</code>, then you will need to delete the deployment (which created the replica set, which created the pod). Otherwise, the higher level controllers will continue to ensure that the objects they are responsible for keeping running stay around in the system, even if you try to delete them manually. Try <code>kubectl get deployment --namespace=kube-system</code> to see if you have a deployment in the <code>kube-system</code> namespace. If so, deleting it should also delete the replica set and the pods that you created. </p>
