Requirements
The virtual machine must have the pty configured. From the KVM server edit the domain and make sure there is this section:
From KVM Server
sudo virsh edit virtual-machine
<serial type='pty'> <source path='/dev/pts/0'/> <target type='isa-serial' port='0'> <model name='isa-serial'/> </target> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/0'> <source path='/dev/pts/0'/> <target type='serial' port='0'/> <alias name='serial0'/> </console>
From Debian / Ubuntu guest
You eithar have to enable the serial service or add it to grub.
Option 1: Enable Serial Service
sudo systemctl enable --now serial-getty@ttyS0.service
Option 2: Add console to grub
Search for the grub.cfg configuration file and add this to GRUB_CMDLINE_LINUX_DEFAULT:
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8"
From KVM server
virsh list Id Name State ---------------------------------------------------- 1 freebsd running 2 ubuntu-box1 running 3 ubuntu-box2 running
Type the following command from KVM host to login to the guest named ubuntu-box1
virsh console ubuntu-box1
OR
virsh console 2
How to enable KVM virsh console access