OpenShift networking
Throughout this book, we continue to reaffirm the importance of choosing the right architecture as it directly impacts the way the cluster will work. We expect that, at this time, all the required network decisions have been made and implemented already – there are a lot of network changes that are not possible after cluster deployment.
Although we already discussed networks in Chapter 2, Architecture Overview and Definitions, and deployed our cluster, we believe that it is important to expand on this topic a bit more and include more details about the differences when considering network usage.
Red Hat OpenShift uses a default Software-Defined Network (SDN) based on Open vSwitch (https://github.com/openvswitch/ovs) that creates a multilayer network solution. This additional layer works as a virtual switch on top of the network layer, and it is responsible for creating, maintaining, and isolating traffic on the virtual LAN.