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Download the QCOW2 image with https://github.com/coreos/coreos-installer[coreos-installer]
coreos-installer download -s "${STREAM}" -p exoscale -f qcow2.xz
Alternatively, QCOW2 images can be manually downloaded from the https://getfedora.org/coreos/download?tab=cloud_operators[download page].
Uncompress the file
unxz "fedora-coreos-$VERSION-exoscale.x86_64.qcow2.xz"
You need to resize the image virtual size to 10G.
Resize image virtual size with qemu-img
qemu-img resize "fedora-coreos-$VERSION-exoscale.x86_64.qcow2" +2G
Then you need to https://community.exoscale.com/documentation/compute/custom-templates/#register-a-custom-template[register your custom Template] from the Web Portal or the Exoscale CLI.
Once it is done, you can use it like an official Exoscale Template Image.