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2.4.1 GRUB Conﬁguration

An entry should be added to grub.conf (often found under /boot/ or /boot/grub/)

to allow Xen / XenLinux to boot. This ﬁle is sometimes called menu.lst, depending

on your distribution. The entry should look something like the following:

title Xen 2.0 / XenLinux 2.6

kernel /boot/xen-2.0.gz dom0_mem=131072

module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0

The kernel line tells GRUB where to ﬁnd Xen itself and what boot parameters should

be passed to it (in this case, setting domain 0’s memory allocation in kilobytes and the

settings for the serial port). For more details on the various Xen boot parameters see

Section 8.2.

The module line of the conﬁguration describes the location of the XenLinux kernel

that Xen should start and the parameters that should be passed to it (these are standard

Linux parameters, identifying the root device and specifying it be initially mounted

read only and instructing that console output be sent to the screen). Some distributions

such as SuSE do not require the ro parameter.

If you want to use an initrd, just add another module line to the conﬁguration, as usual:

module /boot/my_initrd.gz

As always when installing a new kernel, it is recommended that you do not delete

existing menu options from menu.lst — you may want to boot your old Linux kernel

in future, particularly if you have problems.

2.4.2 Serial Console (optional)

In order to conﬁgure Xen serial console output, it is necessary to add an boot option to

your GRUB conﬁg; e.g. replace the above kernel line with:

kernel /boot/xen.gz dom0_mem=131072 com1=115200,8n1

This conﬁgures Xen to output on COM1 at 115,200 baud, 8 data bits, 1 stop bit and no

parity. Modify these parameters for your set up.

One can also conﬁgure XenLinux to share the serial console; to achieve this append

“console=ttyS0” to your module line.

If you wish to be able to log in over the XenLinux serial console it is necessary to add

a line into /etc/inittab, just as per regular Linux. Simply add the line:

c:2345:respawn:/sbin/mingetty ttyS0

and you should be able to log in. Note that to successfully log in as root over the serial

line will require adding ttyS0 to /etc/securetty in most modern distributions.

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Belkin XM Commander Manuale Utente Pagina 17