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

["Gordon McLellan" <gordonthree@xxxxxxxxx>]

I can't comment on some of the fancier images offered by jailtime, but
for something like Centos (or rhel), I recommend you roll your own
image.  I created a local mirror of the Centos 5.1 files, and it takes
about 8 min to do a kickstart installation.

>From what I've learned so far, xvda is provided by the xen block
device driver, which is either in the kernel image, or part of the
initial ramdisk (initrd).  I see in your config file you are booting a
special kernel, but without special initrd.  Usually they go hand in
hand.

Here is my centos 5.1 xen config file.  You'll note I am using an lvm
logical volume as the block device, instead of a loopback file.

# cat netserver
# uncomment the kernel, ramdisk and extra lines for a kickstart install
# make sure to comment the bootloader line
# after the install, comment kernel, ramdisk and extra, uncomment bootloader
#kernel = "/root/xen/centos64-xen-vmlinuz"
#ramdisk = "/root/xen/centos64-xen-initrd.img"
#extra = "text ks=http://192.168.2.8/centos64-2.ks";
bootloader = "/usr/bin/pygrub"
name = "netserver"
memory = "256"
disk = [ 'phy:vg0/xen_netserver,xvda,w', ]
vif = [ 'bridge=xenbr0', ]
vcpus=1
on_reboot = 'restart'
on_crash = 'restart'
on_poweroff = 'restart'
#on_reboot = 'destroy'
#on_crash = 'destroy'
#on_poweroff = 'destroy'

This is the site that taught me how to do a centos domu via kickstart:

http://wiki.centos.org/HowTos/Xen/InstallingCentOSDomU

Gordon

On Mon, Apr 7, 2008 at 11:58 AM, Rudi Ahlers <Rudi@xxxxxxxxxxx> wrote:
> 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
> technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting
> stuff
>
>
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