问题现象
PVE主机/etc/pve/nodes下面的节点配置文件被删除，虚拟机仍在运行，WebUI看不到虚拟机

解决方法
不要重启主机，使用以下命令从集群配置数据库恢复配置文件

cp /var/lib/pve-cluster/config.db /var/lib/clusterconfig.db
systemctl stop pve-cluster.service & systemctl stop corosync.service
cp /var/lib/clusterconfig.db /var/lib/pve-cluster/config.db
systemctl start pve-cluster.service & systemctl start corosync.service

来源：https://forum.proxmox.com/threads/accidentally-deleted-etc-pve-nodes-in-main-node-in-cluster-how-to-recover.147467

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