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

  • To: Antonio Colin <dftonywhite@xxxxxxxxxxx>
  • From: Mark Pryor <tlviewer@xxxxxxxxx>
  • Date: Sat, 8 Oct 2011 18:31:41 -0700 (PDT)
  • Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Sat, 08 Oct 2011 18:32:53 -0700
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From: Antonio Colin <dftonywhite@xxxxxxxxxxx>
To: Xen Users List <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Friday, October 7, 2011 10:02 PM
Subject: [Xen-users] DomU image file on NFS Storage

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_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

I would really appreciate one example or config option.

Here are the snips from an SL6 domU booting from nfsroot. The dom0 is OpenSuSE 
with xen 4.1.1


this took me 3 days to get working. The kernel rebuild with config changes was 
tough until
I gave up on rpm build and went with traditional Make.

All the NFS options were passed via 

extra = ""



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