ufw and docker problems

[dsiganos]

It appears that ufw and docker do not work well together out of the box.
This is a common enough problem that we should have some general advice on it.

Related link (which doesn't have any easy answers):
https://stackoverflow.com/questions/30383845/what-is-the-best-practice-of-docker-ufw-under-ubuntu

Comment from @zhyatt:

From a related note: One solution I found for easy docker setups was in the docker daemon setting {"iptables": false} to disable the docker override. As long as you then explicitly allow 7075 on ufw the node works well.