Magnum needs a image in glance to use when it spawns masters and workers. In openstack stein, we need to use (the outdated) Fedora Atomic 29 image.
# Download image wget http://ftp-stud.hs-esslingen.de/pub/Mirrors/alt.fedoraproject.org/atomic/stable/Fedora-29-updates-20191126.0/AtomicHost/x86_64/images/Fedora-AtomicHost-29-20191126.0.x86_64.raw.xz # Decompress xz -d Fedora-AtomicHost-29-20191126.0.x86_64.raw.xz # Upload to glance. Note the properties. These are important openstack image create \ --disk-format=raw \ --container-format=bare \ --file=Fedora-AtomicHost-29-20191126.0.x86_64.raw \ --min-disk 6 \ --property os_distro='fedora-atomic' \ --property hw_rng_model='virtio' \ --public \ --protected \ fedora-atomic-latest