Create VLANs for your libvirt virtual machines with Ubuntu's netplan
I work at Red Hat but I happen to run some Ubuntu systems.
Ubuntu has netplan for network management. I have to admit I find it easier than the nmcli or nmtui of Network Manager.
In 2020, I wrote about how to configure VLAN for libvirt virtual machines.
I’ll let you go through the 2020 article. The important thing to keep in mind is how a VM can’t connect to the host in the same VLAN in this setup. My trick was to use a second NIC.
If you want to achieve the same setup on Ubuntu it’s fairly simple(r).
Edit /etc/netplan/config.yaml:
network:
renderer: networkd
version: 2
ethernets:
iftrunk:
dhcp4: false
match:
macaddress: "aa:bb:cc:dd:ee:ff"
set-name: iftrunk
addresses:
- 10.10.0.20/16
routes:
- to: default
via: 10.10.0.1
metric: 200
ifmgmt:
dhcp4: false
match:
macaddress: "gg:hh:ii:jj:kk:ll"
set-name: ifmgmt
addresses:
- 10.10.0.2/16
routes:
- to: default
via: 10.10.0.1
metric: 100
nameservers:
addresses: [10.10.0.4]
vlans:
guest:
id: 20
link: iftrunk
addresses: [10.20.0.2/16]
device:
id: 40
link: iftrunk
addresses: [10.40.0.2/16]
Run netplay apply and off you go.
The metric is needed to define which NIC gets priority to the outside world.