The recently released Packer templates for MAAS contain templates for creating both CentOS and RHEL 8 MAAS images. These images require Curtin 19.3-792 which has yet to be released into the Ubuntu archive. I have created a PPA with Curtin 19.3-792 to allow CentOS/RHEL 8 deployments with MAAS. To use the PPA Curtin must be installed on each controller and MAAS must be restarted
sudo add-apt-repository ppa:maas/centos8
sudo apt-get update
sudo apt-get dist-upgrade
sudo systemctl stop maas-regiond
sudo systemctl stop maas-rackd
sudo systemctl start maas-regiond
sudo systemctl start maas-rackd
We are working to get Curtin released into the archive and a CentOS 8 image provided on images.maas.io.