Mailing List Archive: Xen and IP

Xen and IP

Apr 12, 2005, 8:11 AM

Post #1 of 3 (848 views)

Hi

I've got fedora core 4 running in a domain. I configured the IP, but
it didn't seem to work. Basically the fc4 is confiured to use dhcp,
but I wrote the ip in teh rawhide config file. Instead of using teh ip
from the config file it picked up a dhcp assigned ip. Am I missing
something fundamental? Can someone please advise me

My config file is like this: (/etc/xen/rawhide)

kernel ="/boot/vmlinuz-2.6.11-1.1226_FC4xenU"
memory = 100
name = "rhel-4-ws"
nics = 1
disk = ['phy:hda7,hda7,w']
root = "/dev/hda7 ro"
#dhcp = "dhcp"
vip = "10.222.4.231"

Many Thanks
Shaz

No probs.

It won't detect the underlying network card because dom0 is controlling it.
Configure an IP address in the domain config file and it should just work -
it'll use a Xen virtual network interface instead.

Cheers,
Mark

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Re: Xen and IP [ In reply to ]

niv at us

Apr 12, 2005, 8:36 AM

Post #2 of 3 (819 views)

Permalink

Shahzad Chohan wrote:

> Hi
>
> I've got fedora core 4 running in a domain. I configured the IP, but
> it didn't seem to work. Basically the fc4 is confiured to use dhcp,
> but I wrote the ip in teh rawhide config file. Instead of using teh ip
> from the config file it picked up a dhcp assigned ip. Am I missing
> something fundamental? Can someone please advise me
>
> My config file is like this: (/etc/xen/rawhide)
>
> kernel ="/boot/vmlinuz-2.6.11-1.1226_FC4xenU"
> memory = 100
> name = "rhel-4-ws"
> nics = 1
> disk = ['phy:hda7,hda7,w']
> root = "/dev/hda7 ro"
> #dhcp = "dhcp"
> vip = "10.222.4.231"

I wasn't aware vip was a valid parameter?

You do need to provide a MAC address that the virtual interface
on domU can use, and the associated bridge interface on dom0).
e.g.:

vif= [ 'mac=aa:00:00:00:00:11, bridge=xen-br0' ]

The easiest way to configure the IP address of the domU
interface is by editing the normal interface configuration file
(such as /etc/sysconfig/network-scripts/ifcfg-eth0, if the
device name you want to use is eth0).

Make sure you have mounted and are editing the domU
filesystem :).

You can, of course, always manually bring up the
interface once the domain is created.

thanks,
Nivedita

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Re: Xen and IP [ In reply to ]

xen-users at nils

Apr 12, 2005, 9:00 AM

Post #3 of 3 (819 views)

Permalink

Am Dienstag, den 12.04.2005, 08:36 -0700 schrieb Nivedita Singhvi:
> Shahzad Chohan wrote:
>
> > Hi
> >
> > I've got fedora core 4 running in a domain. I configured the IP, but
> > it didn't seem to work. Basically the fc4 is confiured to use dhcp,
> > but I wrote the ip in teh rawhide config file. Instead of using teh ip
> > from the config file it picked up a dhcp assigned ip. Am I missing
> > something fundamental? Can someone please advise me
> >
> > My config file is like this: (/etc/xen/rawhide)
> >
> > kernel ="/boot/vmlinuz-2.6.11-1.1226_FC4xenU"
> > memory = 100
> > name = "rhel-4-ws"
> > nics = 1
> > disk = ['phy:hda7,hda7,w']
> > root = "/dev/hda7 ro"
> > #dhcp = "dhcp"
> > vip = "10.222.4.231"
>
> I wasn't aware vip was a valid parameter?

No, it was "ip":

<http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html#SECTION03210000000000000000>

But afaik all networking options in the /etc/xen/ config files configure
the virtual 'vif*' interfaces within dom0 ("host"), _not_ the 'eth0'
interfaces within a domU ("guest")! If you use bridging (is there a
"xen-br0" device in dom0?), you do not need to configure the vif*
devices, omit options like ip/dhcp/netmask.

> You do need to provide a MAC address that the virtual interface
> on domU can use, and the associated bridge interface on dom0).
> e.g.:
>
> vif= [ 'mac=aa:00:00:00:00:11, bridge=xen-br0' ]
>
> The easiest way to configure the IP address of the domU
> interface is by editing the normal interface configuration file
> (such as /etc/sysconfig/network-scripts/ifcfg-eth0, if the
> device name you want to use is eth0).

Some distro initscripts allow network config via kernel command line
such that you could do that with the "extra=" option, but
RH/FC/CentOS/RawHide do not, so the guest image has to be configured
properly (as Nivedita descibes).

> Make sure you have mounted and are editing the domU
> filesystem :).

... and umount it before "xm create" ;)

> You can, of course, always manually bring up the
> interface once the domain is created.

/nils.

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