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27.12.3. Serial console output from fully virtualized guests

This section covers how to enable serial console output for fully virtualized guests.
Fully virtualized guest serial console output can be viewed with the "virsh console" command.
Be aware fully virtualized guest serial consoles have some limitations. Present limitations include:
  • logging output with xend is unavailable.
  • output data may be dropped or scrambled.
The serial port is called ttyS0 on Linux or COM1 on Windows.
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.conf file by inserting the line " console=tty0 console=ttys0,115200 ".
title Red Hat Enterprise Linux Server (2.6.18-92.el5)
	root (hd0,0)
	kernel /vmlinuz-2.6.18-92.el5 ro root=/dev/volgroup00/logvol00
console=tty0 console=ttys0,115200

	initrd /initrd-2.6.18-92.el5.img
Reboot the guest.
View the serial console messages using the "virsh console" command.


Serial console messages from fully virtualized domains are not logged in /var/log/xen/console as they are for para-virtualized guests.

  Published under the terms of the GNU General Public License Design by Interspire