Re: [Xen-users] how to use prebuilt images from jailtime.org?

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

Sadique Puthen wrote:
> Rudi Ahlers wrote:
> > Hi
> >
> > Does anyone know how to use the images from http://www.jailtime.org/? 
> > I've downloaded the CentOS 5.1 
> > (http://www.jailtime.org/download:centos:v5.1) to my CentOS 5.1 x64 
> > Xen 3.1 server, and unpacked it to my /home folder.
> > Then I took the included config file, centos.5-1.xen3.cfg and copied 
> > it to /xen - and modified to my needs:
> > [root@gimbli home]# more /etc/xen/centos5-1
> > kernel = "/boot/vmlinuz-2.6.18-53.1.13.el5xen"
> > memory = 256
> > name = "centos5-1"
> > vif = [ '' ]
> > dhcp = "dhcp"
> > #disk = ['file:/home/vm/centos.5-1.img,sda1,w', 
> > 'file:/home/centos.swap,sda2,w']
> > #root = "/dev/xvda1 ro"
> >
> > disk = [ "tap:aio:/home/vm/centos.5-1.img,xvda,w" ]
> > root = "/dev/xvda ro"
> Probably you need a initrd image built using --with=xennet 
> --preload=xenblk and specify that as ramdisk= in the guest 
> configuration file and change the /etc/fstab references in your image 
> to xvda after loopback mounting that in dom0.
> --Sadique
Hi Sadique

I'm going to attempt this again. I've installed Xen 3.2 on my CentOS 5.1 
machine, and want to try use this jailtime image again.
I've mounted /home/centos.5-1.img on /mnt/vm, edited /mnt/vm/etc/fstab & 
changed it to use /dev/xvda1
# This file is edited by fstab-sync - see 'man fstab-sync' for details
/dev/xvda1               /                       ext3    defaults 1 1


From this, I realize there's no /dev/xvda on the image:

[root@temp01 ~]# ll /mnt/vm/dev/x*
crw-rw---- 1 root root  10, 179 Mar 25  2001 /mnt/vm/dev/xsvc
crw-r--r-- 1 root root 204, 191 Mar 21  2007 /mnt/vm/dev/xvc0


So, how do I get it?

I'm trying to understand what you mean with the --with-xennet 
--preload=xenblk stuff, but I don't understand how / where to put it. 
Please elaborate?
> > Yet, when I try and use it, I get the following error:
> > VFS: Cannot open root device "xvda" or unknown-block(0,0)
> > Please append a correct "root=" boot option
> > Kernel panic - not syncing: VFS: Unable to mount root fs on 
> > unknown-block(0,0)
> >
> > Any ideas on how to get these images to work?
--

Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other 
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