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

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

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"
>
>
> 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)
I gave up on the jailtime images a while ago: they're useful, but I find 
a fast virt-install to be similarly useful and to cooperate with the 
CentOS/RHEL ideas about where things go. In particular, the /etc/fstab 
of the Jailtime image expects partitions to be on /dev/sda, while the 
current Xen installers and kernels put them in /dev/xvda.
Check the /etc/fstab of your image (which should be mountable with 
kpartx and loopback mounts, and look at its /etc/fstab. Or simply mount 
the partitions as /dev/sda the same way that the Jailtime author did.
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