Note that this will happen for each host that is running Docker, without any coordination between the hosts.
“For each container that is created, a virtual ethernet device is attached to this bridge, which is then mapped to eth0 inside the container, with an ip within the aforementioned network range. From a previous article on Kubernetes Networking : You will need Ansible 2.2+, Docker, Vagrant and Molecule This is episode 2, regarding Swarm networking. The whole subject was way too long for a single article. I hacked another thing together, this time in order to install a highly available Docker Swarm cluster on CoreOS (yeah, Container Linux), using Ansible.