qm-terminal

Attach to a VM's serial console

$ qm terminal 100

$ Ctrl+o

qm terminal vmid

qm terminal attaches to the serial console of a virtual machine. This provides direct console access to the VM without requiring network connectivity or VNC.
Use Ctrl+o to detach from the terminal session without affecting the VM.

Requires the VM to have a serial console configured. The guest OS must have serial console output enabled for useful interaction.

Part of Proxmox VE QEMU/KVM management tools for virtual machine administration.

qm(1), qm-monitor(1), qm-vncproxy(1)