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问题场景：

        本地测试由于之前安装过K8S今天重启无法使用了，于是重新安装了一下，子节点加入主节点报错：

I0808 23:13:04.299356   19180 round_trippers.go:466] curl -v -XGET  -H "Accept: application/json, */*" -H "User-Agent: kubeadm/v1.24.9 (linux/amd64) kubernetes/9710807" 'https://192.168.1.100:6443/api/v1/nodes/node1?timeout=10s'
I0808 23:13:04.300840   19180 round_trippers.go:553] GET https://192.168.1.100:6443/api/v1/nodes/node1?timeout=10s 401 Unauthorized in 1 milliseconds
I0808 23:13:04.300854   19180 round_trippers.go:570] HTTP Statistics: GetConnection 0 ms ServerProcessing 1 ms Duration 1 ms
I0808 23:13:04.300860   19180 round_trippers.go:577] Response Headers:
I0808 23:13:04.300866   19180 round_trippers.go:580]     Audit-Id: 1c5934bb-82ed-4955-9499-84ec4397a8f0
I0808 23:13:04.300871   19180 round_trippers.go:580]     Cache-Control: no-cache, private
I0808 23:13:04.300876   19180 round_trippers.go:580]     Content-Type: application/json
I0808 23:13:04.300881   19180 round_trippers.go:580]     Content-Length: 129
I0808 23:13:04.300886   19180 round_trippers.go:580]     Date: Thu, 08 Aug 2024 15:13:04 GMT
I0808 23:13:04.300902   19180 request.go:1154] Response Body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Unauthorized","reason":"Unauthorized","code":401}

问题解决办法：

        先说一下原因：是之前加入过，有一些残留文件但是删除了还是没有删除干净。那就需要reset一下，执行命令即可：

[root@node1 ~]# kubeadm reset -f

此时再次join没有问题成功。

补充：

1、调试技巧还是在join下增加一个输出细节级别 --v 方便调试：

[root@node1 ~]# kubeadm join 192.168.1.100:6443 --token mk6uf1.eef01he2iqok22tm         --discovery-token-ca-cert-hash sha256:e0ad6e494a6c6b192b88f136a96c421e28d63b235b54091bf04faa5db36aa609 --v=10

2、一键清理并reset，之心过后直接可以运行join：

[root@node1 ~]# rm -rf /root/.kube && rm -rf /etc/cni/net.d && rm -rf /etc/kubernetes/* && kill -9 $(lsof -i:10250 |awk 'NR>1 {print $2}') && kubeadm reset -f