enable serial console on vm in proxmox

tested with

• Gentoo with systemd
• Fedora Server

shell:

qm set 115 -serial0 socket

GUI:

after this the vm should have a serial adapter. Maybe a reboot / full shutdown is needed that it is no longer yellow and correct attached

after reboot check which ttyS* the virtual machine uses (normally the id chosen in proxmox settings)

dmesg | grep tty

this will show something like this:

so we know we need to use ttyS0

edit the serial service unit file with the baud rate needed for console

vim /usr/lib/systemd/system/serial-getty\@.service 

change the ExecStart line to the correct rate. Often 115200

Enable the service. Be sure to add the correct ttyS* (does not exist before)

systemctl enable serial-getty@ttyS0

start the service

systemctl start serial-getty@ttyS0

check status as running

systemctl status serial-getty@ttyS0

now you should be able to connect to the serial port with apps or tools like proxmobo