LXD OpenVSwitch and VLANs
LXD is a fantastic container virtualization tool that comes by default with Ubuntu. In one of my applications I needed to have many containers each within it’s own VLAN network.
So I used OpenVSwitch in combination with LXD to achieve this.
There is no inherent facility in LXD to provide VLAN tag numbers to the interface. So it is necessary to use a “Fake bridge”. I managed to do it after reading this article by Scott – VLANs with Open vSwitch Fake Bridges
Let’s say the OpenVSwitch bridge is named vm-bridge and we want to add 10 fake bridges ranging from VLAN 20 to 30. Here’s how I did it:
for i in $(seq 20 30); do ovs-vsctl add-br vlan$i vm-bridge $i done
In LXD you can specify the bridge to which it will connect containers to, so I created 10 containers using a similar loop 😀
Further to bind each container to the fake bridge this step is needed:
for i in $(seq 20 30); do lxc config device set ct$i eth0 parent vlan$i done