You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of machines by running the following on each node
as root:
#记录下面这句，在其它Node加入时用到。
kubeadm join 10.3.1.20:6443 --token w79yp6.erls1tlc4olfikli --discovery-token-ca-cert-hash sha256:7aac9eb45a5e7485af93030c3f413598d8053e1beb60fb3edf4b7e4fdb6a9db2
根据提示执行：
root@k8s-master01:~# mkdir -p $HOME/.kube
root@k8s-master01:~# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
root@k8s-master01:~# sudo chown $(id -u):$(id -g) $HOME/.kube/config
此时有一台了，且状态为"NotReady"
root@k8s-master01:~# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 NotReady master 3m50s v1.12.0
root@k8s-master01:~#
查看第一台Master核心组件运行为Pod