On Wed, Oct 21, 2020 at 06:31:50PM +0800, Yalan Zhang wrote:
Hi,
I have tried the qemu-ifup script as below with nmcli command as brctl is
deprecated on rhel8, but the guest network can not work.
I think the script needs update. Could you please help to have a look?
Thank you in advance.
1. prepare a linux bridge on the host named br0;
2. prepare the qemu-ifup script as below:
# cat /etc/qemu-ifup
#!/bin/bash
# A br0 bridge should be already set up.
# Compare with:
#
http://en.wikibooks.org/wiki/QEMU/Networking#qemu-ifup
#
# For the bridge setup, see:
#
http://wiki.libvirt.org/page/Networking#Fedora.2FRHEL_Bridging
#
http://gist.github.com/393525
ip link set "$1" up
nmcli c add type bridge-slave ifname $1 con-name $1 master br0 autoconnect
yes
3. start vm with below interface setting:
# virsh dumpxml rh | grep /interface -B5
<interface type='ethernet'>
<mac address='52:54:00:79:ba:dd'/>
<script path='/etc/qemu-ifup'/>
I don't know how to make the script work, but I don't understand
why you are using <script> instead of <source bridge='...'> as
documented at
http://wiki.libvirt.org/page/Networking#Fedora.2FRHEL_Bridging
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x04'
slot='0x00'
function='0x0'/>
</interface>
# virsh start rh
Domain rh started
4.check on guest, the interface can not get dhcp ip address;
5. check on host,
# nmcli con
NAME UUID TYPE DEVICE
br0 f68f73c7-10ee-40c1-bb09-3366d11ac896 bridge br0
...
vnet0 90a48d77-dccc-4b59-98f5-09f8cbd62458 ethernet --
# nmcli dev
DEVICE TYPE STATE CONNECTION
br0 bridge connected br0
...
vnet0 tun unmanaged --
6. hotplug a bridge type interface and compare the tap devices:
# virsh attach-interface rh bridge br0 --model virtio
Interface attached successfully
# nmcli con
NAME UUID TYPE DEVICE
br0 f68f73c7-10ee-40c1-bb09-3366d11ac896 bridge br0
vnet1 07c2a1f8-396f-4d5f-b61f-ef2ddb42ed93 tun vnet1 --->the
hot-plugged one
...
vnet0 90a48d77-dccc-4b59-98f5-09f8cbd62458 ethernet -- ----> the
ethernet one
# nmcli dev
DEVICE TYPE STATE CONNECTION
vnet1 tun connected (externally) vnet1 --->the
hot-plugged one
vnet0 tun unmanaged -- ----> the ethernet one
...
7. from the outputs above, the back-end tun device for ethernet type
interface is unmanaged.
I don't know how to update the script to fix it. Could you please help?
-------
Best Regards,
Yalan Zhang
IRC: yalzhang
--
Eduardo