In this chapter, we learnt about Docker networking using various frameworks, such as the native Docker Swarm. Using libnetwork or out-of-the-box overlay networks, Swarm provides multihost networking features.

Kubernetes, on the other hand, has a different perspective from Docker, in which each pod gets its unique IP address and communication between pods can occur with the help of services. Using Open vSwitch or IP forwarding and advanced routing rules, Kubernetes networking can be enhanced to provide connectivity between pods on different subnets across hosts and the ability to expose the pods to the external world. In the case of Mesosphere, we can see that Marathon is used as the backend for the networking of the deployed containers. In the case of DCOS by Mesosphere, the entire deployed stack of machines is treated as one machine in order to provide a rich networking experience between deployed container services.

In the next chapter, we will learn about security and QoS for basic Docker networking by understanding kernel namespace, cgroups, and virtual firewalls.