Re: FW: [Xen-users] Xen 3: Functional NAT Possible?

[Jeff Utter <jeffutter.lists@xxxxxxxxx>]

Hi, sorry for sending this again if you already got it.. however any 
posts i make to the list seem to not show up (for me at least) plus my 
mail server (running on a xen DomU has been flaky... due to the 
ip/firewall issues i describe below. so I'm sending this again in case 
it didn't go through.
Ewan Mellor wrote:
> > Ian Pratt wrote:
> > >  
> > >
> > > >         I have been trying for days now to get a working nat setup with
> > my 
> > > > domU's using the default nat scripts.
> > > Just look at what the demo CD does for a nice example of how to set up
> > > NAT.
> > >
> > > Ian
> > >  
> >         Ok, i checked that out, and it seemed to help me figure it out a
> > lot. 
> > It looks like the key i was missing was having dhcp=dhcp in my xend
> > config. Now each time a vm starts up it edits my dhcpd config and sets
> > it up for that VM and the vm gets an ip and is setup to connect to the
> > Internet. Wonderful.
> >
> >         The problem still remains though, that each new VM i setup... or
> > even if i stop a vm and start it, it ends up with a different ip. This
> > makes the vm's pretty useless if i want to forward ports to the vms. I
> > always specify mac id's for my vms:
> >
> > vif = [ 'mac=00:50:22:22:22:02']
> >
> > if i specify an ip aswell:
> >
> > vif = [ 'mac=00:50:22:22:22:02, ip=10.0.1.2']
> >
> > when i try to start that vm it complains something about vif 0 not being
> > able to start
> This should work -- it does for me.  Could you find out why the vif cannot
> start?  If you can't see anything from the logs, then please use xen-bugtool,
> which is a little application that will collate your logs in a tarball so that
> you can send them to me.
>
> Thanks,
>
> Ewan.
The actual error is:

[root@dom0 ~]# xm create -c mysql
Using config file "/etc/xen/mysql".
Error: Device 0 (vif) could not be connected. Hotplug scripts not working.
[root@dom0 ~]#

the only thing that added to the logs is:


xen-hotplug.log:

/etc/xen/scripts/vif-nat: line 90: (0xFFFFFFFF << (32 - )) & 0xFFFFFFFF
: syntax error: operand expected (error token is ")) & 0xFFFFFFFF ")
xenstore-read: couldn't read path backend/vbd/4/2050/physical-device
xenstore-read: couldn't read path backend/vbd/4/2049/physical-device
/etc/xen/scripts/vif-nat: line 90: (0xFFFFFFFF << (32 - )) & 0xFFFFFFFF
: syntax error: operand expected (error token is ")) & 0xFFFFFFFF ")

here is my xend-config.sxp (minus comments):

(logfile /var/log/xend.log)
(loglevel DEBUG)
(xend-http-server yes)
(xend-relocation-server yes)
(xend-address localhost)
(xend-relocation-address localhost)
(network-script 'network-nat dhcp=yes')
(vif-script     'vif-nat dhcp=yes')
(dom0-min-mem 160)
(dom0-cpus 0)

here is the config for the domain i was trying to start (minus comments):

kernel = "/boot/vmlinuz-2.6.12.6-xen3_2.1_fc4"
ramdisk = "/boot/initrd-2.6.12.6-xen3_2.1_fc4.img"
memory = 160
name = "mysql"
vif = [ 'mac=00:50:22:22:22:03, ip=10.0.3.2']
nics=1
dhcp = "dhcp"
hostname="mysql.sadclown.net"
disk = ['file:/xen/mysql.img,sda1,w',
        'file:/xen/mysql.swap.img,sda2,w']
root = "/dev/sda1 ro"
extra = "4"
on_reboot   = 'restart'


let me know if there is any more info you need.

-Jeff


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