How to attach second interface to VM

[Arjun Baindur]

I created a VM on a KVM host via following CLI:

maas admin vm-host compose 1389 cores=32 memory=65535 storage=default:512 architecture=amd64/generic interfaces='eth0:name=br_vlan_2,type=bridge' -k

Where br_vlan_2 is a bridge on the host. Now I want a dual-homed VM, so I have another bridge br_vlan_3. These map to VLAN interfaces on the KVM host

Supposed the ID of the VM is pk6md7, I tried the following, but it has no effect. MaaS UI does not report a new interface on the VM Machine, and I dont see the libvirt XML updated, no NIC hot plugged in the VM

maas admin machine update pk6md7 interfaces=ens5:name=br_vlan_3,type=bridge -k

What is the proper way to attach/detach a secondary NIC/interface to a VM in MaaS?

[Jacopo Rota (r00ta)]

afaik this is not supported. You can turn this into a feature request on Discourse.

ATM you can only specify multiple interfaces at compose time like

maas admin vm-host compose 1389 cores=32 memory=65535 storage=default:512 architecture=amd64/generic interfaces='eth0:name=br_vlan_2,type=bridge;eth1:name=br_vlan_3,type=bridge' -k

However, you can achieve your goal using LXD directly. Just login to the LXD server and do something like

lxc config device add THE_LXD_VM_NAME eth1 nic network=br_vlan_2 name=eth1 nictype=bridged ..

(see https://discuss.linuxcontainers.org/t/how-to-add-a-network-interface-in-lxc/437)

and then report back the interface to maas.