[2.7.1] Pod VMs lose static IP after powering down

[Pedro Guimarães]

Using:

MAAS 2.7.1 (8262-g.9a49af7df-0ubuntu1~18.04.1)

When I build VMs with the following command:

maas root pod compose 2 hostname=<hostname< cores=8 memory=24576 storage=100.0 zone=3 interfaces=eth0:space=oam-space,ip=<IP>,mode=static

I get a VM in "new" then "commissioning" state with the fixed <IP> value.
However, once that VM powers down, it loses the static IP set via constraints.

The only reliable way I have to force VMs to get a static IP is, as a post-deployment step, run:

maas root interface unlink-subnet ${SYSTEM_ID} ${NIC_ID} id=${EXISTING_LINK_ID}
maas root interface link-subnet ${SYSTEM_ID} ${NIC_ID} mode=STATIC subnet=${SUBNET_ID} ip_address=${STATIC_IP}