[TheIronYuppie]

Networking on AWS works fine with no additional networking as well.

Overlay networking is not required if you're running within a bunch of nodes that can see each other. Only if you get more complex will you require something, and there are quite a few solutions (Flannel, Weave, Calico, etc)

Full disclosure: I work at Google on Kubernetes

[merb]

But most of them suck, and they suck even more when you configured them badly (badly in terms of you used an option which comes by default). However with the bigger vxlan adoption most performance issues are fixed, still, could have some improvmenents. I also think that IPv6 could fix a lot of these things...