重置集群
如果安装过程中出现问题, 无论是Master节点还是Worker节点, 都可以执行kubeadm reset命令进行重置：

[root@K8S-TEST-M1 kubernetes]# kubeadm reset
[reset] Reading configuration from the cluster...
[reset] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[reset] WARNING: Changes made to this host by 'kubeadm init' or 'kubeadm join' will be reverted.

[preflight] Running pre-flight checks
[reset] Removing info for node "k8s-test-m1" from the ConfigMap "kubeadm-config" in the "kube-system" Namespace
{"level":"warn","ts":"2020-07-09T17:41:54.061+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:41:54.117+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:41:54.239+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:41:54.460+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:41:54.946+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:41:55.846+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:41:57.672+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:42:00.938+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:42:07.510+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:42:20.455+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
{"level":"warn","ts":"2020-07-09T17:42:46.865+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-30fb2f52-f866-462a-9cee-f7fe87cef67d/192.168.122.61:2379","attempt":0,"error":"rpc error: code = Unknown desc = etcdserver: re-configuration failed due to not enough started members"}
W0709 17:42:46.867820 30317 removeetcdmember.go:61] [reset] failed to remove etcd member: etcdserver: re-configuration failed due to not enough started members
.Please manually remove this etcd member using etcdctl
[reset] Stopping the kubelet service
[reset] Unmounting mounted directories in "/var/lib/kubelet"
[reset] Deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki]
[reset] Deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/bootstrap-kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf]
[reset] Deleting contents of stateful directories: [/var/lib/etcd /var/lib/kubelet /var/lib/dockershim /var/run/kubernetes /var/lib/cni]

The reset process does not clean CNI configuration. To do so, you must remove /etc/cni/net.d

The reset process does not reset or clean up iptables rules or IPVS tables.
If you wish to reset iptables, you must do so manually by using the "iptables" command.

If your cluster was setup to utilize IPVS, run ipvsadm --clear (or similar)
to reset your system's IPVS tables.

The reset process does not clean your kubeconfig files and you must remove them manually.
Please, check the contents of the $HOME/.kube/config file.
清除CNI配置
rm -rf /etc/cni/net.d
清除iptables

下面命令谨慎操作，清除iptables

iptables -F
iptables -X

然后重启节点

清除IPVS配置
ipvsadm --clear
清除kubeconfig
rm -f $HOME/.kube/config
清除日志
rm -f /var/log/kube-audit/*

K8S v1.18.x 部署-Kubeadm方式-6：重置集群

下面命令谨慎操作，清除iptables

然后重启节点

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