DevOps: Puppet, Docker, and Kubernetes

Building your own bridge for container communication

As we know, when the Docker daemon starts, it creates a bridge called docker0 and all the containers would get the IP from it. Sometimes we might want to customize those settings. Let's see how we can do that in this recipe.

Getting ready

I am assuming you already have a Docker set up. On the Docker host, stop the Docker daemon. On Fedora, use the following command:

$ systemctl stop docker

How to do it…

1. To remove the default docker0 bridge, use the following command:

   $ sudo ip link set dev docker0 down 
   $ sudo brctl delbr docker0
   

2. To create the custom bridge, use the following command:

   $ sudo brctl addbr br0 
   $ sudo ip addr add 192.168.2.1/24 dev br0 
   $ sudo ip link set dev bridge0 up
   

3. Update the Docker ...