/etc/kubernetes是总的配置文件路径
/etc/kubernetes/manifests是kubelet寻找静态pod清单的路径etcd.yamlkube-apiserver.yamlkube-controller-manager.yamlkube-scheduler.yaml
admin.conf用于集群管理和kubeadm自身管理pki/ca.crt,ca.keyfor the Kubernetes certificate authorityapiserver.crt,apiserver.keyfor the API server certificateapiserver-kubelet-client.crt,apiserver-kubelet-client.keyfor the client certificate used by the API server to connect to the kubelets securelysa.pub,sa.keyfor the key used by the controller manager when signing ServiceAccountfront-proxy-ca.crt,front-proxy-ca.keyfor the front proxy certificate authorityfront-proxy-client.crt,front-proxy-client.keyfor the front proxy client