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# Download image
Browse here https://builds.coreos.fedoraproject.org/browser?stream=stable&arch=x86_64

# Decompress
xz -d <image.qcow2.xz>

# Convert
qemu-img convert -f qcow2 -O raw <image.qcow2> <image.raw>

# Upload to glance. Note the  properties. These are important
openstack image create \
                      --disk-format=raw \
                      --container-format=bare \
                      --file=<imagw>.raw \
                      --min-disk <big enough> \
                      --property os_distro='fedora-atomiccoreos' \
                      --property hw_rng_model='virtio' \
                      --public \
                      --protected \
                      fedora-coreos<version>-stable