21.6. Troubleshooting with Serial Consoles
Linux kernels can output information to serial ports. This is useful for debugging kernel panics and hardware issues with video devices or headless servers. The subsections in this section cover setting up serial console output for host physical machines using the KVM hypervisor.
This section covers how to enable serial console output for fully virtualized guests.
Fully virtualized guest serial console output can be viewed with the
Be aware fully virtualized guest serial consoles have some limitations. Present limitations include:
- output data may be dropped or scrambled.
The serial port is called
ttyS0on Linux or
You must configure the virtualized operating system to output information to the virtual serial port.
To output kernel information from a fully virtualized Linux guest into the domain, modify the
/boot/grub/grub.conffile. Append the following to the
title Red Hat Enterprise Linux Server (2.6.32-36.x86-64) root (hd0,0) kernel /vmlinuz-2.6.32-36.x86-64 ro root=/dev/volgroup00/logvol00 \
console=tty0 console=ttyS0,115200initrd /initrd-2.6.32-36.x86-64.img
Reboot the guest.
On the host, access the serial console with the following command:
# virsh console
You can also use
virt-managerto display the virtual text console. In the guest console window, select Serial 1 in Text Consoles from the View menu.