With the release of Docker 1.9, the multi-host and overlay network has become one of its primary feature. It enables private networks that can be established to connect multiple containers. We will be creating the overlay network on a manager node running in swarm cluster without an external key-value store. The swarm network will make the network available to the nodes in the swarm that require it for a service.

When we deploy the service that uses overlay network, the manager automatically extends the network to the nodes that are running the service tasks. Multi-host networking requires a store for service discovery, so now we will create a Docker machine to run this service.

Overlay network across multiple hosts

For the following deployment, we will be using Docker machine application that creates the Docker daemon on a virtualization or cloud platform. For the virtualization platform, we will be using VMware fusion as the...