From testing, it seems that the PXE boot configuration is invalid. The coreos.inst.image_url kernel argument should actually be coreos.live.rootfs_url, and the metal.x86_64.raw.gz image should not be used, but rather the live-rootfs.x86_64.img image.
From testing, it seems that the PXE boot configuration is invalid. The
coreos.inst.image_urlkernel argument should actually becoreos.live.rootfs_url, and themetal.x86_64.raw.gzimage should not be used, but rather thelive-rootfs.x86_64.imgimage.