Using the host gateway backend
As we've seen already, Flannel supports two types of overlay network. Using either UDP or VXLAN encapsulation, Flannel can build an overlay network between Docker hosts. The obvious advantage to this is that you can provision networks across disparate Docker nodes without having to touch the physical underlay network. However, some types of overlay networks also introduce a significant performance penalty, especially for processes that perform encapsulation in user space. Host gateway mode aims to solve that problem by not using an overlay network. This, however, comes with its own limitations. In this recipe, we'll review what host gateway mode can provide as well as show how to configure it.
Getting ready
In this ...
Get Docker Networking Cookbook now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
