问题解决：The connection to the server xxxxx:6443 was refused - did you specify the right host or port?
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具体排查过程是真的忘了，前后开关了十几个网页。
1、查看kubelet是否正常 systemctl status kubelet
2、kubelet未启动的情况，查看kubelet日志 journalctl -xefu kubelet
3、不过我这里是启动的
4、中间跳过 n 步，发现是 apiserver 没起来
5、中间又跳过 n 步，发现是 etcd 没起来导致 apiserver 没起来
6、中间又跳过 n 步，尝试备份后移除 cd /var/lib/etcd 目录下的文件，因为是在异常情况下断电导致的数据异常
7、重启
至于是否有副作用，不晓得
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