https://blog.csdn.net/gsying1474/article/details/53256599
执行：
[root@lab1 coredns]# kubectl delete -f coredns.yaml
现象：
[root@lab2 k8s]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-6c65fc5cbb-7xvzs 0/1 ContainerCreating 0 2m
coredns-6c65fc5cbb-kh4zg 0/1 ContainerCreating 0 2m
原因：
修改node名称后的遗留症状
查看pod日志，最后部分
[root@lab2 k8s]# kubectl describe po coredns-6c65fc5cbb-7xvzs -n kube-system
"cni0" already has an IP address different from 10.244.5.1/24
解决：
所有节点执行如下：
rm -rf /var/lib/cni/flannel/* && rm -rf /var/lib/cni/networks/cbr0/* && ip link delete cni0
rm -rf /var/lib/cni/networks/cni0/*
