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RE: [Xen-users] DomU image file on NFS Storage

Hi Erick,

Yes, that is only for locally, AoE, iSCSI (if I remember rightly) stored images. 
I'm using Xen 4.0.0 + Debian Lenny as Dom0. 
The CentOS4 *.img file was created with virt-manager within the Dom0 and stored in the local hard drive, as usual. 
Now, I want to store that same *.img file but on an NFS server and boot it from there for later migration, which
is exactly what I want to do.

I have tried mounting the DomU filesystem on the NFS server and then export the directory to the Dom0, but it does not boot. 
And it woult not work either for a HVM which is what I would be implementing later.

Do you have any option or idea of how could I do this?

Thank you,


Date: Sat, 8 Oct 2011 11:18:12 +0200
From: zod@xxxxxxxxxxxxx
To: dftonywhite@xxxxxxxxxxx
Subject: Re: [Xen-users] DomU image file on NFS Storage


I guess I'm missing something important but it is not

disk = [ 'file:/mnt/images/centos/image.img,hda,w']

you want to do? or does it have to be nfs-mounted in the DomU?


On 10/08/2011 07:02 AM, Antonio Colin wrote:
Hi everyone,

I have created a CentOS4 PV on a Xen host contained in a *.img file. Now I want to store that image file
on a NFS server. Does anyone have a config.sxp file example and want to share it on a pastebin service?

I have put the *.img on an NFS server, then mounted the img using #mount -o loop image.img /mnt/centos
and then exported it to the xen host but it does not work since the DomU kernel does not have Root NFS support.

How can I do instead to read directly from the xen host the *.img file stored in the NFS server, I think it would
look like: nfs_root = "/mnt/images/centos/image.img".

** This does not work at all, it ends up with a kernel panic on console.

kernel = "/mnt/images/centos/boot/vmlinuz-2.6.9-89.ELxenU"
ramdisk = "/mnt/images/centos/boot/initrd-2.6.9-89.ELxenU.img"
memory = 512
name = "centos4"
vcpus = 1
vif = ['']
dhcp = "dhcp"
ip = ""
netmask  = ""
gateway  = ""
hostname = "centos4"
nfs_root = "/mnt/images/centos/"
nfs_server = ""
root = "/dev/root"
on_reboot   = 'restart'
on_crash    = 'restart'

I would really appreciate one example or config option.

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