On 10/31/2011 05:02 AM, Cam Mac wrote:
To reply to myself, the problem seems to be a delay (possibly due to a
bug?) whereby it times out. I cannot see any DHCP requests leaving the
br0 device. However, when I use 'crtl+b' to get into the gPXE prompt,
and run 'dhcp net0' some DHCP packets are sent and get a reply, and
the interface gets an IP address.
Not sure what is going on here!
-Cam
-
KVM host has been set up with bridged networking, and I can
successfully kickstart a host using the command line
virt-install --name=vtest --ram 512 -f /dev/vg00/vtest --vcpus=2
--network bridge=br0 -l
http://10.62.128.11/mirrors/scientific/6.1/x86_64/os -x
"ks=http://10.62.128.11/kickstart/vm-test.cfg console=ttyS0"
However, I cannot get it to work when using virt-manager GUI
I select 'Network Boot' (PXE), under 'Advanced Options', I select
'Host device em1 (Bridge 'br0'), leaving the default Mac address
options, however, it fails to get a DHCP address, giving the
following error in the console:
---------------------------8<------------------------
Waiting for link up on net0....ok
DHCP (net052:54:00:35:8c:c2)......................connection timed
out (0x4c106035)
No more network devices
---------------------------8<------------------------
It generates the following network config in the xml:
----------------8<----------------
<interface type='bridge'>
<source bridge='br0'/>
<mac address='52:54:00:35:8c:c2'/>
<model type='virtio'/>
</interface>
----------------8<----------------
>From KVM guests I have kickstarted via the command line method, I can
get DHCP addresses.
I cannot even see any DHCP requests on br0 on the KVM when it is
attempting to get an address via GUI method
You need to add:
DELAY=0
to your interface definition for the bridge you are using for the VMs.
By default, the bridge will set a delay on any new MAC address to
prevent a Spanning Tree issue.
In the case of VMs on a bridge, there should not ever be a spanning tree
issue, so just turn the delay off.
Here is the one we use for our VMs:
DEVICE=br0
ONBOOT=yes
TYPE=Bridge
BOOTPROTO=none
DELAY=0
Good luck!
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