kubeadm
join on slave 找到 master,但 master 从来没有看到 slave:
user1@ubuntu:~$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
ubuntu Ready master 1h v1.8.0
user1@ubuntu:~$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system etcd-ubuntu 1/1 Running 0 1h
kube-system kube-apiserver-ubuntu 1/1 Running 0 1h
kube-system kube-controller-manager-ubuntu 1/1 Running 0 1h
kube-system kube-dns-545bc4bfd4-576sl 3/3 Running 0 1h
kube-system kube-flannel-ds-fwqct 1/1 Running 0 1h
kube-system kube-proxy-fkk6m 1/1 Running 0 1h
kube-system kube-scheduler-ubuntu 1/1 Running 0 1h
kube-system kubernetes-dashboard-7f9dbb8685-b5gmh 1/1 Running 0 26m
user1@ubuntu:~# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.0", GitCommit:"6e937839ac04a38cac63e6a7a306c5d035fe7b0a", GitTreeState:"clean", BuildDate:"2017-09-28T22:46:41Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}