Through the use of the bridge Driver, users can provision custom bridges to connect to containers. You can create as many as you like with the only real limitation being that you must use unique IP addressing on each bridge. That is, you can't overlap with existing subnets that are already defined on other network interfaces.
In this recipe, we'll learn how to define a user-defined bridge as well as some of the unique options available to you during its creation.
The docker network subcommand was introduced in Docker 1.9, so you'll need a Docker host running at least that version. In our examples, we'll be using Docker version 1.12. You'll also want to have a good understanding of your current network layout, so you can follow along as we inspect the current configuration. It is assumed that each Docker host is in its native configuration.