[2.4, pod] RAM usage of Pod is not recognized as a constraint

[Markus Fritsche]

Packages:

root@picard:~# dpkg -l '*maas*'|cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============================-====================================-============-=================================================
ii maas 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all "Metal as a Service" is a physical cloud and IPAM
ii maas-cli 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS client and command-line interface
ii maas-common 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS server common files
ii maas-dhcp 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS DHCP server
ii maas-proxy 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS Caching Proxy
ii maas-rack-controller 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all Rack Controller for MAAS
ii maas-region-api 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all Region controller API service for MAAS
ii maas-region-controller 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all Region Controller for MAAS
ii python3-django-maas 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS server Django web framework (Python 3)
ii python3-maas-client 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS python API client (Python 3)
ii python3-maas-provisioningserver 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 all MAAS server provisioning libraries (Python 3)

How to replicate:
I have four physical machines for which I used MAAS to deploy Ubuntu-Server 18.04 on. I locked these machines, installed kvm etc., created a bridge and added Pods on those machines. Each machine has 16GiB RAM, 4 CPU Cores (2 physical x 2 hyperthreading) and 120GB of SSD disc space (it's a little cluster toy setup initially created with NUCs back in 2014).

I am using conjure-up (juju) to install the "Hadoop + Spark" charms.

All virtual machines are created on the same pod (which might be a conjure-up/ juju issue):

Name: s2031
Type: Virsh (virtual systems)
Local storage (GiB) -61.8 free of 109.5
iSCSI storage (GiB): 0 free of 0
Cores: -4 free of 4
RAM: -24.9 free of 15.6

Over Commit Ratio is set to "1" for Memory and Cores.