Re: [Xen-users] mount DomU root fs via. NFS

[Gordan Bobic <gordan@xxxxxxxxxx>]

If you want to run your dom0 on NFS root, there is nothing stopping you 
from making a custom initrd that will initialize your bridge device 
appropriately. The kernel and initrd get fetched by PXE via TFTP before 
the kernel even boots, so you just need to make sure your initrd brings 
with it everything you need to set up the bridge and initialize it 
before switchroot.
Extract the initrd you are using and look at the /init file. It should 
be just a simple shell script. You can edit it to do what you want, 
repack the initrd, upload it back to the tftp server, and you should be 
good to go.
Gordan

On 07/30/2014 06:03 PM, Jeenu Viswambharan wrote:
> Hi,
>
> I've Dom0 running on Vexpress with the file system mounted via. NFS. I'm
> also trying to get the DomU file system mounted via. NFS.
>
> Because the Dom0 file system is already mounted via. NFS, I believe I
> can't use bridging because that'd involve taking the eth0 interface
> down. A quick search suggested that bringing eth0 down will freeze the
> system. I therefore instead chose to go with NAT instead.
>
>  From [1], all that's to be done in Dom0 is to
>
>    echo 1 > /proc/sys/net/ipv4/ip_forward
>
> And I've in my guest configuration:
>
>    ...
>    vif = [ "script=vif-nat,ip=192.168.1.1" ]
>    extra = "... root=/dev/nfs nfsroot=my.ip.add.ress:/path/to/root ..."
>    ...
>
> What I see is the guest waits to mount root file system, and later times
> out and crashes. I do see messages like
>
>    [  687.170573] IPv6: ADDRCONF(NETDEV_UP): vif3.0: link becomes ready
>
> from Dom0. But, presumably, requests from guest aren't reaching the NFS
> server.
>
> Could you suggest if and what's wrong with my setup? Is NAT the right
> mechanism for this purpose?
>
> Thanks.
>
> --
> Jeenu
>
> [1] 
> http://wiki.xen.org/wiki/Host_Configuration/Networking#Network_Address_Translation_.28NAT.29
>
>
> -- IMPORTANT NOTICE: The contents of this email and any attachments are 
> confidential and may also be privileged. If you are not the intended recipient, 
> please notify the sender immediately and do not disclose the contents to any 
> other person, use it for any purpose, or store or copy the information in any 
> medium.  Thank you.
>
> ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in 
> England & Wales, Company No:  2557590
> ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, 
> Registered in England & Wales, Company No:  2548782
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users