9:48 a.m.
Hi,
I have a standalone VM host running Debian bookworm, which features
libvirt 9.0.0 and qemu 7.2. My users mostly have Debian unstable on
their notebooks, which currently comes with virt manager 4.1.0. The host
has a 802.1Q VLAN trunk to the network with contains a number of VLANs.
Each VLAN has a bridge host-side, for example VLAN 188:
[3/114]mh@spiral:~ $ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group
default qlen 1000
link/ether 4c:52:62:b4:53:12 brd ff:ff:ff:ff:ff:ff
altname enp2s0
inet6 fe80::4e52:62ff:feb4:5312/64 scope link
valid_lft forever preferred_lft forever
5: int188: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group
default qlen 1000
link/ether 96:f3:9b:c6:7f:db brd ff:ff:ff:ff:ff:ff
inet6 fe80::94f3:9bff:fec6:7fdb/64 scope link
valid_lft forever preferred_lft forever
21: vlan188@eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master
int188 state UP group default qlen 1000
link/ether 4c:52:62:b4:53:12 brd ff:ff:ff:ff:ff:ff
This is configured with systemd-networkd:
==> /etc/systemd/network/10-eno1.network <==
[Match]
Name=eno1
[Network]
Description=eno1 VLAN 1xx
DHCP=no
IPForward=no
IPv6AcceptRA=no
IPv6SendRA=no
DHCPv6PrefixDelegation=no
[Network]
VLAN=vlan188
/etc/systemd/network/int188.netdev <==
[NetDev]
Name=int188
Kind=bridge
==> /etc/systemd/network/int188.network <==
[Match]
Name=int188
[Network]
Description=int188 Labor
DHCP=no
IPForward=no
IPv6AcceptRA=no
IPv6SendRA=no
DHCPv6PrefixDelegation=no
==> /etc/systemd/network/vlan188.netdev <==
[NetDev]
Name=vlan188
Kind=vlan
[VLAN]
Id=188
==> /etc/systemd/network/vlan188.network <==
[Match]
Name=vlan188
[Network]
Description=vlan188 Labor
Bridge=int188
DHCP=no
IPForward=no
IPv6AcceptRA=no
IPv6SendRA=no
DHCPv6PrefixDelegation=no
I can attach a VM to that vlan in virt-manager by selecting the virtual
NIC, network source: bridge device, device name: int188. This works and
results in the following XML snippet:
<interface type="bridge">
<mac address="52:54:00:af:fd:f8"/>
<source bridge="int188"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x01"
slot="0x00" function="0x0"/>
</interface>
Network configuration host-wise looks like this:
1 [13/119]mh@spiral:~ $ virsh net-list
Name State Autostart Persistent
----------------------------------------
[14/120]mh@spiral:~ $ virsh iface-list
Name State MAC Address
--------------------------------------
eno1 active 4c:52:62:b4:53:12
int188 active 96:f3:9b:c6:7f:db
[15/120]mh@spiral:~ $ virsh iface-dumpxml int188
<interface type='bridge' name='int188'>
<mtu size='1500'/>
<bridge stp='off' delay='1500'>
<interface type='vlan' name='vlan188'>
<link speed='1000' state='up'/>
<vlan tag='188'>
<interface name='eno1'/>
</vlan>
</interface>
</bridge>
</interface>
[16/121]mh@spiral:~ $
So far so good, this is useable. However, I need to document a list of
available interfaces since the interface name "int188" needs to be
entered in a text area in virt-manager.
The dialog in virt-manager also has a list box that is pre-filled with
"Virtual Network 'default'", "Bridge Device..." and
"Macvtap device...",
and the text area for the bridge device name shows up once "Bridge
device" is selected.
Can I configure somewhere (may it be in libvirt, may it be in
virt-manager) a list of network interfaces, so that this list box has
like "Bridge Device int181", "Bridge Device int188" etc in addition
to
the three entries that are already present, to give my users a hint
about which interfaces might be available?
You can also point me towards documentation if I might have missed
something.
Greetings
Marc
--
-----------------------------------------------------------------------------
Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421
1:35 p.m.
New subject: How can I have a list of interfaces in virt-manager network
config
Hi,
On Fri, Dec 08, 2023 at 04:48:09PM +0100, Marc Haber wrote:
You can also point me towards documentation if I might have missed
something.
Nobody?
Greetings
Marc
--
-----------------------------------------------------------------------------
Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421
2:20 p.m.
New subject: How can I have a list of interfaces in virt-manager network
config
On Fri, Dec 08, 2023 at 04:48:09PM +0100, Marc Haber wrote:
> You can also point me towards documentation if I might have missed
> something.
Nobody?
Interfaces of what? What you can't get from this?
[@ ~]# virsh domiflist vps-ad2
Interface Type Source Model MAC
-------------------------------------------------------
[@~]# virsh iface-list
Name State MAC Address
---------------------------------------------------
2:37 p.m.
New subject: How can I have a list of interfaces in virt-manager network
config
On Tue, Dec 12, 2023 at 08:20:52PM +0000, Marc wrote:
> On Fri, Dec 08, 2023 at 04:48:09PM +0100, Marc Haber wrote:
> > You can also point me towards documentation if I might have missed
> > something.
>
> Nobody?
>
Interfaces of what? What you can't get from this?
[@ ~]# virsh domiflist vps-ad2
Interface Type Source Model MAC
-------------------------------------------------------
That list is empty on my new host because it doesn't have any domains
yet.
[@~]# virsh iface-list
Name State MAC Address
---------------------------------------------------
That gives a list of the interfaces, for example:
mh@spiral:~ $ virsh iface-list
Name State MAC Address
--------------------------------------
eno1 active 4c:52:62:b4:53:12
int182 active da:9c:98:9e:35:86
int192 active 16:64:a5:ff:e8:92
[3/135]mh@spiral:~ $
(just two interfaces listed)
But what does this have to do with my question?
Greetings
Marc
--
-----------------------------------------------------------------------------
Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421
2:28 p.m.
New subject: How can I have a list of interfaces in virt-manager network
config
On 12/8/23 10:48 AM, Marc Haber wrote:
[very detailed description of a network setup, the important point
being that there is a bridge created outside of libvirt]
I can attach a VM to that vlan in virt-manager by selecting the
virtual
NIC, network source: bridge device, device name: int188. This works and
results in the following XML snippet:
<interface type="bridge">
<mac address="52:54:00:af:fd:f8"/>
<source bridge="int188"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x01"
slot="0x00" function="0x0"/>
</interface>
[more details]
So far so good, this is useable. However, I need to document a list of
available interfaces since the interface name "int188" needs to be
entered in a text area in virt-manager.
The dialog in virt-manager also has a list box that is pre-filled with
"Virtual Network 'default'", "Bridge Device..." and
"Macvtap device...",
and the text area for the bridge device name shows up once "Bridge
device" is selected.
Can I configure somewhere (may it be in libvirt, may it be in
virt-manager) a list of network interfaces, so that this list box has
like "Bridge Device int181", "Bridge Device int188" etc in addition
to
the three entries that are already present, to give my users a hint
about which interfaces might be available?
So you have a host bridge created outside libvirt that you want to be
listed in the potential connections in virt-manager (rather than needing
to type the name of the bridge).
You can do that by creating a libvirt virtual network with <forward
mode='bridge'/> - this type of virtual network expects that the bridge
device will have already been created and attached to the world by
someone other than libvirt:
https://libvirt.org/formatnetwork.html#using-an-existing-host-bridge
Create a temporary file (call it /tmp/xyz.xml for example) with the text
of that example, but replace "br0" with "int188", and
"host-bridge" with
whatever name you want to use (it could be "int188", or it could be,
e.g. "engineering-support" or something equally descriptive). define and
start this network with:
virsh net-define /tmp/xyz.xml
virsh net-start engineering-support
virsh net-autostart engineering-support
Now "engineering-support" should show up as a potential connection in
virt-manager's list of virtual networks.
If you look at the domain XML, you'll find that
<interface type='bridge'>
<source bridge='int188'/>
...
has been replaced with
<interface type='network'>
<source network='engineering-support'/>
...
but the result will be the same - the guest's tap interface will be
connected to the bridge int188.
2:46 p.m.
New subject: How can I have a list of interfaces in virt-manager network
config
On Tue, Dec 12, 2023 at 03:28:50PM -0500, Laine Stump wrote:
On 12/8/23 10:48 AM, Marc Haber wrote:
> [very detailed description of a network setup, the important point being that there
is a bridge created outside of libvirt]
Sorry for being too detailed, I reckoned it is better to give all
information that MIGHT be useful.
So you have a host bridge created outside libvirt that you want to be
listed
in the potential connections in virt-manager (rather than needing to type
the name of the bridge).
Yes, that sounds like it.
You can do that by creating a libvirt virtual network with
<forward
mode='bridge'/> - this type of virtual network expects that the bridge
device will have already been created and attached to the world by someone
other than libvirt:
https://libvirt.org/formatnetwork.html#using-an-existing-host-bridge
Yes, that solved my issue nicely. Thank you very much for the pointer.
Greetings
Marc
--
-----------------------------------------------------------------------------
Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421
227
days inactive
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days old
5 comments
3 participants
participants (3)
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Marc Haber