You can demostrate how kubernetes stores everything in etcd (v3):
You can exec etcdctl
rigth in the etc pod:
kubectl exec -it \
-n kube-system etcd-minikube \
-- sh -c 'ETCDCTL_CACERT=/var/lib/localkube/certs/etcd/ca.crt \
ETCDCTL_CERT=/var/lib/localkube/certs/etcd/peer.crt \