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Fetch the latest image suitable for the `qemu` platform using `coreos-installer` (or https://getfedora.org/coreos/download/[download and verify] it from the web). You can use `coreos-installer` https://quay.io/repository/coreos/coreos-installer[as a container], or on Fedora install it from the repos.
STREAM="stable"
# as an installed binary:
coreos-installer download -s "${STREAM}" -p qemu -f qcow2.xz --decompress -C ~/.local/share/libvirt/images/
# or as a container:
podman run --pull=always --rm -v $HOME/.local/share/libvirt/images/:/data -w /data \
quay.io/coreos/coreos-installer:release download -s "${STREAM}" -p qemu -f qcow2.xz --decompress
Launch a new machine via `virt-install`, using the Ignition file with your customizations.
IGNITION_CONFIG="/path/to/example.ign"
IMAGE="/path/to/image.qcow2"
VM_NAME="fcos-test-01"
VCPUS="2"
RAM_MB="2048"
DISK_GB="10"
virt-install --connect="qemu:///system" --name="${VM_NAME}" --vcpus="${VCPUS}" --memory="${RAM_MB}" \
--os-variant="fedora-coreos-$STREAM" --import --graphics=none \
--disk="size=${DISK_GB},backing_store=${IMAGE}" \
--qemu-commandline="-fw_cfg name=opt/com.coreos/config,file=${IGNITION_CONFIG}"
`virt-install` requires both the OS image and Ignition file to be specified as absolute paths.
Depending on your version of `virt-install`, you may not be able to use `--os-variant=fedora-coreos-*` and will get an error. In this case, you should pick an older Fedora variant (`--os-variant=fedora31` for example). You can find the variants that are supported by you current version of `virt-install` with `osinfo-query os | grep '^\s*fedora'`.
Make sure that your user has access to `/dev/kvm`. The default is to allow access for everyone, but on some distributions you may need to add yourself to the `kvm` group.