node节点注册提示：failed to get config map: Unauthorized

提示如下：

[root@node1 ~]# kubeadm join 10.5.1.10:6443 --token llilpc.9je7qvdn7l4sygoo     --discovery-token-ca-cert-hash sha256:a82baf34d02c5338c6c7c8e9234316dffecee709cea7cc76cda47c8e595f1745
W0122 19:36:32.447752   12903 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
error execution phase preflight: unable to fetch the kubeadm-config ConfigMap: failed to get config map: Unauthorized
To see the stack trace of this error execute with --v=5 or higher

错误原因，token令牌失效，解决方法：
在master节点执行下面的命令

sudo kubeadm token create

然后再执行下面的命令重新生成注册令牌

sudo kubeadm token create --print-join-command

然后杀死node节点所有K8S相关的进程再注册一次即可

重新加入master节点提示error execution phase preflight: [preflight] Some fatal errors occurred

[root@node1 ~]# kubeadm join 10.5.1.5:6443 --token 1a8fot.izehoikcbfm6vcj6     --discovery-token-ca-cert-hash sha256:41498e76da4b483ec99963948303e3df1d0a4308bb096d33f77d6f8f42e53e63
W0203 17:56:00.454059   11793 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
[ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher

解决办法：删除相关残留文件

rm -f /etc/kubernetes/kubelet.conf    #删除k8s配置文件

rm -f /etc/kubernetes/pki/ca.crt    #删除K8S证书

然后重新加入

验证一下：

端口占用提示：[ERROR Port-10250]: Port 10250 is in use

解决办法：查看占用进程，然后杀掉，再加入

安装相关工具(-q：静默安装)

sudo yum install -y net-tools -q

然后查看端口

netstat -ntpl | grep 10250

可以看出，是K8S占用了，那就尝试重启服务看看能不能解决

此时，端口已经不在使用了，然后重新加入

加入master提示：error execution phase kubelet-start: error uploading crisocket: timed out waiting for the condition

#关闭swap交换

swapoff -a

#重置K8S配置

kubeadm reset

#重置配置，重启服务

systemctl daemon-reload&&systemctl restart docker kubelet

#删除配置文件

rm -rf $HOME/.kube/config

#更新iptables规则

iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X

引用:K8S问题汇总