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

[Jeenu Viswambharan <Jeenu.Viswambharan@xxxxxxx>]

On Thu, Jul 31, 2014 at 09:53:32, xen-users-bounces@xxxxxxxxxxxxx wrote:
> On Wed, 2014-07-30 at 18:03 +0100, Jeenu Viswambharan wrote:
> >  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
>
> [1] also says you need to do
>         iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
> to enable NAT, otherwise you are just in regular routing mode.
>
> If you don't do that then you would have to arrange a subnet for your
> VMs and appropriate routing tables in your external infrastructure
> etc.

Uh, my init script was doing that too; I missed to mention it earlier.

The behaviour is reproducible - guest waits for the NFS mount and
crashes. All I see in Dom0 dmesg pertaining to virtual interfaces is:

  [  262.676269] IPv6: ADDRCONF(NETDEV_UP): vif1.0: link is not ready
  [  272.153571] IPv6: ADDRCONF(NETDEV_CHANGE): vif1.0: link becomes ready

I also have a virtual interface in Dom0 while the guest is alive:

  vif1.0  Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet addr:192.168.1.128  Bcast:0.0.0.0  Mask:255.255.255.255
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 B)  TX bytes:468 (468.0 B)

If I'm reading this right, there were 6 packets received from the guest.
How do we know what happened to these?

FWIW, `iptables -t nat -L` is:

  Chain PREROUTING (policy ACCEPT)
  target     prot opt source               destination

  Chain INPUT (policy ACCEPT)
  target     prot opt source               destination

  Chain OUTPUT (policy ACCEPT)
  target     prot opt source               destination

  Chain POSTROUTING (policy ACCEPT)
  target     prot opt source               destination
  MASQUERADE  all  --  anywhere             anywhere

Anything suspicious here?

--
Jeenu

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