We've made several assumptions in our DinD environments that should be revisited:
https://github.com/nds-org/ndslabs-dind/blob/master/dockerd-entrypoint.sh

• MTU 1404
• Storage driver VFS (when overlay performs better)
• Docker version (David suggests using an env var?)

Affected images will include:

• cloud9-docker
• docker
• jenkins
• toolmanager