Hi All, I've been doing some testing of running Docker inside a rkt (fly) container. Part of the reason for this is to be able to run various Docker versions that are not currently shipping within the CoreOS release.
I wanted to share the (somewhat hack-ish) process so far, and see if anyone else is interested in testing / has feedback / finds interesting ways this is broken. The starting point (thanks Brandon): https://gist.github.com/philips/4ba6f9888499266b0ab09d95991e6784 I've broken the above into two pieces, a wrapper script and the service file, to allow for running docker commands on the cli easier: https://gist.github.com/aaronlevy/1211c6bb69d9cc60d8965f8733963c13#file-docker-wrapper-sh https://gist.github.com/aaronlevy/1211c6bb69d9cc60d8965f8733963c13#file-docker-service For example: DOCKER_VERSION=1.9.1 /opt/bin/docker-wrapper version DOCKER_VERSION=1.9.1 /opt/bin/docker-wrapper run -it busybox /bin/sh I've also added a bind mount for root certificates: https://gist.github.com/aaronlevy/1211c6bb69d9cc60d8965f8733963c13#file-docker-wrapper-sh-L34 At this point it seems to be working reasonably well based on some initial testing with the coreos-kubernetes single-node installation (running CoreOS alpha with Docker 1.9.1): https://github.com/coreos/coreos-kubernetes/compare/master...aaronlevy:docker-in-rkt
