I've also had great fun with Firecracker and virt-builder (http://libguestfs.org/virt-builder.1.html http://libguestfs.org/virt-builder.1.html) as a way to prep

I've also had great fun with Firecracker and virt-builder (http://libguestfs.org/virt-builder.1.html http://libguestfs.org/virt-builder.1.html) as a way to prepare and use generic distros on Firecracker. (The only additional step is to use guestfish to "download" root partition from disk image created with virt-format and virt-builder)