Ok, it seems in this combination demo01gravwell01 is the one already up
as it has a live network section:
<interface type='bridge'>
<mac address='52:54:00:6a:da:e8'/>
<source network='corp_net' bridge='br0'/>
<target dev='vnet0'/>
<model type='e1000'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</interface>
demo01inmon01 doesn't - I assume it is not started due to that issue
<interface type='network'>
<mac address='52:54:00:11:61:54'/>
<source network='corp_net'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</interface>
It all looks quite normal for a bridge setup.
Trying to recreate with that.
$ sudo brctl addbr testbr0
$ cat corp-net.xml
<network>
<name>corp_net</name>
<forward mode='bridge'/>
<bridge name='testbr0'/>
</network>
$ virsh net-define corp-net.xml
Network corp_net defined from corp-net.xml
$ virsh net-start corp_net
Network corp_net started
Obviously this is a rather empty bridge, but I only want to know if I
can start more than one guest on it. ...
I set this in a uvt template:
<interface type='network'>
<source network='corp_net'/>
<model type='virtio'/>
</interface>
$ uvt-kvm create --template template-corpnet.xml --password ubuntu bionic-test2
arch=amd64 release=bionic label=daily
$ uvt-kvm create --template template-corpnet.xml --password ubuntu bionic-test2
arch=amd64 release=bionic label=daily
As expected both work with the status being:
$ brctl show testbr0
bridge name bridge id STP enabled interfaces
testbr0 8000.fe5400dead42 no vnet1
vnet2
$ virsh net-info corp_net
Name: corp_net
UUID: d352751a-4b27-41ed-957e-8a83c105d2db
Active: yes
Persistent: yes
Autostart: no
Bridge: testbr0
$ virsh net-dumpxml corp_net
<network connections='2'>
<name>corp_net</name>
<uuid>d352751a-4b27-41ed-957e-8a83c105d2db</uuid>
<forward mode='bridge'/>
<bridge name='testbr0'/>
</network>
So all working for me.
Do you have anything in dmesg like an apparmor deny or anything else that might
provide a hint what is failing?
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https://bugs.launchpad.net/bugs/1787680
Title:
guest fails to start if another running guest has an interface in the
same bridge
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