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Re: [Xen-users] Slackware 12 DomU NIC increments on each start

  • To: Florian Heigl <florian.heigl@xxxxxxxxx>
  • From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
  • Date: Sat, 24 Nov 2007 07:16:47 +0000
  • Cc: Xen list <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 23 Nov 2007 23:15:29 -0800
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Florian Heigl wrote:
Another try...
please note i do not intent to offend single people giving the below
advice, but just try to wake up the hand-typing mac=xx:xx: fraction of
xen gurus on this list. The very question below has probably come up
dozens to hundreds of times over the last years and I feel sad a large
number of people still thinks it's a good thing to live with.[1]

2007/11/23, jim burns <jim_burn@xxxxxxxxxxxxx>:
On Fri November 16 2007 8:21:58 am Russell Packer wrote:
So - I have a Slackware 12.0 system running. I used rsync to copy the
system over to a partition on an already running Xen system with several
guests running. I just copied everything over apart from /proc and /sys.
I used my standard, "nothing special" Xen configuration file - pretty
much all the default settings (vif = [ '' ], etc) apart from I change
which disk partition I'm going to run from. Simple enough.
As mentioned by other knowledgeable people on this list, try assigning a mac
address to your virtual card: vif = [ 'mac=00:16:3e:xx:xx:xx,
script=vif-whatever, bridge = your-choice' ] .

...There's about 20 auto-assignment scripts floating
And some people found the guid/mac-querying from xm list --long and
hacked something around that.

But what's it with understanding that 20 different wheels will never
run as smooth as 4 round ones?

This is a functionality best placed with Xen
- as half of it is already there
- as xend is the best thing to query other members in
clustered/load-balanced setups
- as there is NO point in everyone being asked to handle it manually
or hack scripts
- as it will save time for everyone.

Please try to see my point, there are some people trying to use Xen
for more than a dev box and I'm getting really desparate seeing how a
load of topics for advanced deployment are generally being put off,
just because it [editing by hand] works nicely while you only handle
3-20 domUs, plus it's even a waste of energy for one single domU.
And I don't think pointing yet another person at a hack (manually
setting MAC or having a script autoincrement it) that had already
grown a beard when Xen 2.0.1 was still hot makes any sense.


[1] Yes... I know a lunatic was defined as a minority of one.
You've a reasonable point. I don't know what the commercial Xensource tools do about this: Some system tools, like "virt-install" in RHEL, will allow you to hard-code the MAC address at run-time. This is handy. Unfortunately, that tool does not allow you to set other useful characteristics, like multiple disk images or a hard-coded vifname. We seem to see a big divorce between the capabilities of the modest freeware tools (like virt-install) and the commercial grade ones, such as the fairly expensive RHN tool suite from RedHat.

Is anyone out there using the Xensource tools? Do they have these capabilities?

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