It’s just awesome. I so wished I’d had these tools when I started my career some 14 years ago. Problems I’ve ran into with Docker:
- diskspace, as docker with aufs puts all stuff in /var/lib/docker – make sure there’s enough room :-)
- stability, with the version of Ubuntu and docker at my disposable has been pretty unstable with kernel oopses eventually freezing the entire host OS
But “apart” from the stability issue, it’s really nice to run packer inside an lxc (from docker) with the goal of producing vagrant boxes. :-)