Comment 8 for bug 1938573

Another impact user brought this to my attention:

We enlisted 3 racks of machines (124 nodes) successfully but were unable to successfully enlist machines in the 4th rack (only 4 out of around 40).

The machines that fail to enlist, just stay in the 'Powering On' state in the MAAS UI but via the IPMI console, we can see that the machines PXE boot and reboot. Furthermore, the machines are pretty much identical (same manufacturer/models)

Specifics:

#maas DEB package:
2.8.6-8602-g.07cdffcaa-0ubuntu1~18.04.1

# sanitized logs:
maas.api: [info] <HOSTNAME>: Enlisted new machine
maas.node: [info] <HOSTNAME>: Status transition from NEW to COMMISSIONING
maas.node: [warn] <HOSTNAME>: Could not change the power state. No rack controllers can access the BMC.
maas.node: [info] <HOSTNAME>: Aborting COMMISSIONING and reverted to NEW. Unable to power control the node. Please check power credentials.
maas.node: [info] <HOSTNAME>: Status transition from COMMISSIONING to NEW
maas.node: [error] <HOSTNAME>: Could not start node for commissioning: No rack controllers can access the BMC of node <HOSTNAME>