1.添加节点
（master）查看目前节点
[root@k8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 153m v1.14.0
k8s-node1 Ready <none> 117m v1.14.0
[root@k8s-master ~]#
clone k8s在执行kubeadm init命令前时的状态机器，修改ip,修改主机名
node2上操作
hostnamectl set-hostname k8s-node2
reboot
添加k8s-node2节点（node2上操作）
[root@k8s-node2 ~]# echo > /proc/sys/net/ipv4/ip_forward
[root@k8s-node2 ~]# kubeadm join 192.168.111.130: --token ymtl8s.933t59qfezi9gjcq --discovery-token-ca-cert-hash sha256:7816d0b2572e6c569ed8e63ece15a7a08d06ed3fc89698245bf2aaa6acc345d7
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.14" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Activating the kubelet service
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap... This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details. Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
master上查看是否成功添加
[root@k8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 178m v1.14.0
k8s-node1 Ready <none> 142m v1.14.0
k8s-node2 Ready <none> 27s v1.14.0
root@k8s-master ~]# kubectl get po --all-namespaces -o wide ##-o查看pod运行在那个node上，--namespace=kube-system查看系统pod
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system coredns-fb8b8dccf-ltlx4 / Running 3h12m 10.244.0.4 k8s-master <none> <none>
kube-system coredns-fb8b8dccf-q949f / Running 3h12m 10.244.0.5 k8s-master <none> <none>
kube-system etcd-k8s-master / Running 3h11m 192.168.111.130 k8s-master <none> <none>
kube-system kube-apiserver-k8s-master / Running 3h12m 192.168.111.130 k8s-master <none> <none>
kube-system kube-controller-manager-k8s-master / Running 3h11m 192.168.111.130 k8s-master <none> <none>
kube-system kube-flannel-ds-amd64-2gr2v / Running 177m 192.168.111.130 k8s-master <none> <none>
kube-system kube-flannel-ds-amd64-bsrkx / Running 157m 192.168.111.131 k8s-node1 <none> <none>
kube-system kube-flannel-ds-amd64-xdg5p / Running 15m 192.168.111.132 k8s-node2 <none> <none>
kube-system kube-proxy-2mj4q / Running 157m 192.168.111.131 k8s-node1 <none> <none>
kube-system kube-proxy-ffd8s / Running 15m 192.168.111.132 k8s-node2 <none> <none>
kube-system kube-proxy-qp5k7 / Running 3h12m 192.168.111.130 k8s-master <none> <none>
kube-system kube-scheduler-k8s-master / Running 3h12m 192.168.111.130 k8s-master <none> <none>
[root@k8s-master ~]#
2.删除节点
master上执行
kubectl drain k8s-node2 --delete-local-data --force --ignore-daemonsets
kubectl delete node k8s-node2
node2上执行
kubeadm reset
3.节点重启
无需特别操作，保证节点kubelet是开机启动就行
systemctl enable kubelet
systemctl restart kubelet 或者 service kubelet start