Looks interesting, but I don't really know anything about Docker except the elevator pitch so I don't understand what's achieved here.
Can some explain what is container linking?
Can some explain what is container linking?
Container linking lets containers connect to each other without exposing ports via docker.
The "linking" is exposed to the container via an /etc/hosts entry, so e.g. --link test-db:db adds "a.b.c.d db" to /etc/hosts which can be used by anything that needs it.
As mentioned by jon-wood, the simple linking approach only works with containers on the same machine unfortunately.