[fosk]

While I do agree it's not as easy as it should be, connecting containers it's actually doable (https://docs.docker.com/userguide/dockerlinks/), while logs are still a big mess because there is no unified strategy.

Databases are also tricky to run in containers, because even those with the best replication strategies can afford losing nodes but at a high cost (like re-balancing nodes, etc), and containers still don't have the stability to provide an acceptable uptime that's worth the risk.

On a side note, since you mentioned nginx and RESTful APIs, I would check out Kong (https://github.com/Mashape/kong) which is built on top of nginx, and provides plugins to alleviate some of these problems (http://getkong.org/plugins/).