As mentionned in OpenVz wiki's Limitations section:

Bridges cannot be created inside Docker containers running inside OpenVZ container

So ok you can forget almost everything about Rancher UI as it uses docker "inceptionning" and docker nested bridging... Next time I'll have a look at theses before testing :p

Ok next.

Lets try a single node Mesos/Marathon stack.

Nothing will starts because of that nasty error:

/dev/fd/62: No such file or directory

and here is how to fix it and start playing :

ln -s /proc/self/fd /dev

more stuff is coming, stay tuned