Using docker cloud can result in a black box experience should something go wrong.

This is especially the case when you provision the node from the cloud UI.

Building a stack with Docker/Dockercloud -AuthorisedKeys however, can get you SSH access, to poke around inside.

This will let you add root access via your SSH cert.

Ensure you also open up port 22 on your VM

Once inside, you can take a peek at various logs using a couple of methods.