kubenetes

安裝kubenetes https://kubernetes.io/docs/setup/independent/install-kubeadm/ 

• kubeadm: the command to bootstrap the cluster.啓動集羣命令

• kubelet: the component that runs on all of the machines in your cluster and does things like starting pods and containers.運行於集羣上的全部機器，用來啓動pod和容器

• kubectl: the command line util to talk to your cluster. 命令行執行某些命令

The master is the machine where the control plane components run, including etcd (the cluster database) and the API server (which the kubectl CLI communicates with).主機是控制組件運行的地方，包括了etcd集羣數據庫和api server（kubectl命令行與之進行通訊）