Change docker backend to dlite

[onnimonni]

I have been testing: https://github.com/nlf/dlite for few days. TL;DR: It is awesome.

dlite:

• automatically starts in system restart
• doesn't need any eval $(dev machine env) since it mounts docker.sock in host machine
• ip address doesn't change.

[silvamerica]

Yeah I've been using dlite off and on for a few weeks now. I'm not sure how we can change the backend without causing a lot of issues for existing users, but I'm totally open to the possibilities!

[onnimonni]

Existing users already have issues which this would solve ;).

I think we could check existance of 'docker-machine status dev' and give a huge prompt to users about breaking changes.

I'd really rather contribute to this project instead of having my own fork with all changes. In few weeks I will start rolling new dev tools internally and dlite is a must.

Do You have Any ideas of how we could make this happen?

[silvamerica]

A few options include:

• As you said, checking for the existence of the VM already
• Adding a check in dev update that would prevent updating past a certain point
• Maintaining a separate branch for dlite
• Generalizing everything so that it can work with multiple backends, including docker-machine with virtualbox, docker-machine-driver-xhyve, and dlite. ...and more! :-D

All of these have tradeoffs, and aren't necessarily mutually exclusive.