VM disk encryption - pass paasphrase

[Tdreissi]

Hi,

My goal is to run a debian base image with disk encryption.
Proxmox host has zfs filesystem.
VM is installed with encrypted “/root disk” and serial socket.

Now I have to enter my “passphrase” when rebooting.
It's annoying, but that's the disadvantage of encryption.

VM /etc/default/grub --- config “text console=tty0 console=ttyS0,115200n8”
- without entry
- passphrase entry is only possible via Proxmox GUI VM console “noVNC”

- with entry
- passphrase can be entered via Proxmox host cli “qm terminal vmid” and gui console xterm.js BUT no longer via “noVNC”

I don't really understand this...

What is the “best practice” for VM disk encryption and passphrase?

Thanks...