refer

static pod
Kubeadm writes static Pod manifest files for control plane components to /etc/kubernetes/manifests. The kubelet watches this directory for Pods to create on startup

/etc/kubernetes/manifests# ls
etcd.yaml  kube-apiserver.yaml  kube-controller-manager.yaml  kube-scheduler.yaml

apiserver

  1. using –runtime-config= to test cluster for new change