单master集群--master节点IP发生改变

报错如下：

kubectl get all
Unable to connect to the server: dial tcp 100.100.137.200:6443: connect: no route to host

恢复过程如下：

• 所有机器修改hosts解析文件

sed -i 's#100.100.137.200#100.100.137.210#g' /etc/hosts
sed -i 's#100.100.137.201#100.100.137.211#g' /etc/hosts
sed -i 's#100.100.137.202#100.100.137.212#g' /etc/hosts

• 把/etc/kubernetes/*.conf中所有的旧ip换成新ip

cd /etc/kubernetes
find . -type f | xargs sed -i "s/100.100.137.200/100.100.137.210/g"

• 替换$HOME/.kube/config文件中的旧ip为新ip

cd $HOME/.kube/
find . -type f | xargs sed -i "s/100.100.137.200/100.100.137.210/g"

• 修改$HOME/.kube/cache/discovery/ 下的文件夹名改成新的ip

cd $HOME/.kube/cache/discovery/
mv 100.100.137.200_6443/ 100.100.137.210_6443/

• 重新生成证书

cd /etc/kubernetes/pki
mv apiserver.key apiserver.key.bak
mv apiserver.crt apiserver.crt.bak
kubeadm init phase certs apiserver  --apiserver-advertise-address  100.100.137.210
I0513 17:27:16.733946   24860 version.go:255] remote version is much newer: v1.33.0; falling back to: stable-1.23
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master01] and IPs [10.96.0.1 100.100.137.210]

• 重启kubelet，编辑以下 ConfigMap，将旧 IP 替换成新的 IP

systemctl restart kubelet
kubectl -n kube-system edit cm kube-proxy
kubectl -n kube-public edit cm cluster-info

• 所有node节点重新加入集群

重启master01机器之后在master节点生成加入集群的命令：
reboot
kubeadm token create --print-join-command


kubeadm  reset
kubeadm join 100.100.137.210:6443 --token jfekda.agtcoz9ib95ua0m1 --discovery-token-ca-cert-hash sha256:759d3df4caeaa1c3bd85f18249cbd45b56828d9a88b77c715aae63e57a43e139

• 验证

这时已经完成：

kubectl get pod -A 
NAMESPACE       NAME                                        READY   STATUS      RESTARTS        AGE
default         busybox1-857448d9ff-shdfz                   1/1     Running     4               5d11h
default         busybox2-5c8f48d797-kk8mx                   1/1     Running     4               5d11h
default         busybox3-c997b9cc4-tlvrq                    1/1     Running     3               5d10h
default         nginx-deployment-6b9d659f5f-qbchs           1/1     Running     3               5d8h
ingress-nginx   ingress-nginx-admission-create-mlft8        0/1     Completed   0               5d8h
ingress-nginx   ingress-nginx-admission-patch-z5zss         0/1     Completed   0               5d8h
ingress-nginx   ingress-nginx-controller-7464b7f559-82dsg   1/1     Running     2               5d8h
kube-system     calico-kube-controllers-5bb5d4f7f4-zzhwz    1/1     Running     9               4d11h
kube-system     calico-node-44chg                           1/1     Running     0               3m46s
kube-system     calico-node-9hnfx                           1/1     Running     0               3m46s
kube-system     calico-node-r5gpv                           1/1     Running     0               3m46s
kube-system     coredns-64897985d-rxkhg                     1/1     Running     3 (5m54s ago)   5d11h
kube-system     coredns-64897985d-zcgtf                     1/1     Running     3 (5m54s ago)   5d11h
kube-system     etcd-master01                               1/1     Running     1 (5m59s ago)   19m
kube-system     kube-apiserver-master01                     1/1     Running     1 (5m57s ago)   19m
kube-system     kube-controller-manager-master01            1/1     Running     4 (5m59s ago)   5d11h
kube-system     kube-proxy-5lv5m                            1/1     Running     2               5d11h
kube-system     kube-proxy-9khvt                            1/1     Running     3               5d11h
kube-system     kube-proxy-vxp2g                            1/1     Running     3 (5m59s ago)   5d11h
kube-system     kube-scheduler-master01                     1/1     Running     4 (5m59s ago)   5d11h
test            nginx-deployment1-79df89b8bb-2wgrx          1/1     Running     2               4d7h
test            nginx-deployment2-645594b99c-g2p8z          1/1     Running     1               4d7h

kubectl get node
NAME       STATUS   ROLES                  AGE    VERSION
master01   Ready    control-plane,master   6d3h   v1.23.9
node01     Ready    <none>                 6d3h   v1.23.9
node02     Ready    <none>                 6d3h   v1.23.9