Also, just as an aside, your assertion that Docker is too “fat” and too “corporate” is untrue IMO. I’ve been using Docker for a _very_ long time (since ~0.7 or so) and if you take a closer look:
root@proxy:~# ls -lah /usr/bin/docker /usr/bin/dockerd
-rwxr-xr-x 1 root root 35M Jul 21 20:35 /usr/bin/docker
-rwxr-xr-x 1 root root 96M Jul 21 20:35 /usr/bin/dockerd
root@proxy:~#
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