Re: [Xen-users] Grub does not load Xen

[Mike Lovell <mike@xxxxxxxxxxxx>]

Andrey Chursin wrote:
> Hello
>
> I have installed XEN on CentOS using
>
> yum install xen
>
> But when in grub menu i choosing 'Centos with xen' it do not boot.
> I see next screen:
> http://img201.imageshack.us/my.php?image=xentroublerc9.jpg and then
> nothing occurs. After some time(~30 secs) system automatically reboot
>
> This is grub's menu.lst file:
>
>
> # grub.conf generated by anaconda
> #
> # Note that you do not have to rerun grub after making changes to this file
> # NOTICE:  You have a /boot partition.  This means that
> #          all kernel and initrd paths are relative to /boot/, eg.
> console=ttyS0,57600 console=tty0
> #          root (hd0,0)
> #          kernel /vmlinuz-version ro root=/dev/sda3
> console=ttyS0,57600 console=tty0
> #          initrd /initrd-version.img
> #boot=/dev/sda
> serial --unit=0 --speed=57600
>
> terminal --timeout=2 serial console
>
> default=1
> timeout=5
>
> hiddenmenu
> tittle CentOS (2.6.18-92.1.18.el5xen)
>         root (hd0,0)
>         kernel /xen.gz-2.6.18-92.1.18.el5
>         module /vmlinuz-2.6.18-92.1.18.el5xen ro root=LABEL=/ acpi=off
> noapic nodmraid console=ttyS0,57600 console=tty0
>         module /initrd-2.6.18-92.1.18.el5xen.img
> title CentOS (2.6.18-92.1.18.el5)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.18-92.1.18.el5 ro root=LABEL=/ acpi=off
> noapic nodmraid console=ttyS0,57600 console=tty0
>         initrd /initrd-2.6.18-92.1.18.el5.img
> title CentOS (2.6.18-92.el5)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.18-92.el5 ro root=LABEL=/ acpi=off noapic
> nodmraid console=ttyS0,57600 console=tty0
>         initrd /initrd-2.6.18-92.el5.img
>
>
> Choosing second option boot linux, but without xen. Choosing first
> option makes screen i provided above.
>
> Thank you for your attention.
Just out of curiosity, does the machine still boot? Do you see console 
output on the vga/local console? From looking at the options, it appears 
that you are trying to use both a serial and vga consoles. I fought with 
doing a serial console and xen for a while. What I was able to figure 
out is that defining the console settings on the line for the xen kernel 
and then not doing any console settings on the linux kernel works. Here 
is an example from one of my xen boxes.
title Xen 3.2-1-amd64 / Debian GNU/Linux, kernel 2.6.18-6-xen-amd64 serial
    root (hd0,0)
    kernel /boot/xen-3.2-1-amd64.gz dom0_mem=786432 console=com2,vga 
com2=115200,8n1
    module /boot/vmlinuz-2.6.18-6-xen-amd64 root=/dev/hda1 ro 
pciback.permissive pciback.hide=(00:02.1)
    module /boot/initrd.img-2.6.18-6-xen-amd64

This is for a Debian box and I also limit the size of the dom0 memory. 
But something similar should work for you on CentOS. The important parts 
for you would be the 'console=com2,vga com2=115200,8n1' and then no 
console definition on the linux kernel line. It looks like you are using 
com1 instead of com2 so change the settings to match what you want.
Hope that helps.

Mike

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