I wrote my first Mojolicious web app yesterday, a cloud-init meta-data server to enable running pre-built VM images (e.g. as provided by debian, ubuntu, etc) without having to install and manage a complete, full-featured cloud environment like openstack.
I hacked up something similar several years ago when I was regularly building VM images at home for openstack at work, with just plain-text files served by apache, but that had pretty-much everything hard-coded.
fakecloud does a lot more and allows per-VM customisation of user-data (using the IP address of the requesting host). Not bad for a day’s hacking with a new web framework.