问题描述：
现有测试环境有3台k8s服务器，现在新添加两台服务器，发现新加的服务器flannel.1和cni0网卡没有生成
[root@slave1 ~]# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:99:7b:ac:77 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.247.137 netmask 255.255.255.0 broadcast 192.168.247.255
inet6 fe80::e506:6851:fb1e:4f55 prefixlen 64 scopeid 0x20<link>
inet6 fe80::5082:19ec:92f7:a4f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:40:b9:ac txqueuelen 1000 (Ethernet)
RX packets 1139 bytes 355392 (347.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 876 bytes 118103 (115.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
排查
1 检查master节点的flannel服务
[root@master ~]# kubectl get pods -n kube-system | grep flannel
kube-flannel-ds-amd64-9ccf7 1/1 Running 0 7m23s
kube-flannel-ds-amd64-j8q9w 1/1 Running 0 7m23s
kube-flannel-ds-amd64-t6wxg 1/1 Running 0 7m23s
如果master节点没有找到对应的flannel服务，执行kubeadm reset,并重新生成flannel服务
kubeadm reset
rm -rf /etc/kubernetes/admin.conf
rm -rf $HOME/.kube/config
2 重置flannel网络
（1）删除node节点（master操作）
kubectl delete node xxx
（2）node 节点删除cni和flannel网卡（node操作）
kubeadm reset
ifconfig cni0 down
ifconfig flannel.1 down
ifconfig del flannel.1
ifconfig del cni0
ip link del flannel.1
ip link del cni0
# 命令执行过程中可能会有报错，有的网卡不存在则忽视
# 后面重新加入后会生成的
（3）加入节点准备工作(master操作)
# 通过 kubedam 重新生成 token
[root@master ~]# kubeadm token create --print-join-command
~~
kubeadm join 192.168.247.136:6443 --token x5phh9.9lpb629032p7dseb --discovery-token-ca-cert-hash sha256:bd23534d635b46f5316f0d388bd88853a6ddb47b1c04129bf25ea31cdbbfba4a
# 将文件传输至node
[root@master ~]# scp /etc/kubernetes/admin.conf
usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]
[-l limit] [-o ssh_option] [-P port] [-S program]
[[user@]host1:]file1 ... [[user@]host2:]file2
[root@master ~]# scp /etc/kubernetes/admin.conf root@192.168.247.137:/etc/kubernetes/admin.conf
root@192.168.247.137's password:
admin.conf 100% 5451 3.1MB/s 00:00
（4）node加入集群
[root@slave1 ~]# kubeadm join 192.168.247.136:6443 --token x5phh9.9lpb629032p7dseb --discovery-token-ca-cert-hash sha256:bd23534d635b46f5316f0d388bd88853a6ddb47b1c04129bf25ea31cdbbfba4a
~~~
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.
# 加入成功
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