I had a similar problem PVE 7, but it was probably my own fault.
I was upgrading from 7.1 to 7.2 and forgot to do it in screen or tmux. Ssh connection was interrupted and at some point /etc/pve was empty. A duplicate file in config.db prevented mounting /etc/pve . I had two rows named...
Here is how to make a copy-on-write clone of a container when storage is rbd on ceph.
In this example we take a snapshot of 184 which is in ceph pool "mypool" and copy-on-write clone will be 199.
pct snapshot 184 snap1
rbd snap protect mypool/vm-184-disk-0@snap1
pct create 199...
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