Extending on Laurent Bernaille’s excellent 3-part deep dive series on Docker’s overlay networks [https://blog.d2si.io/2017/04/25/deep-dive-into-docker-overlay-networks-part-1/] I wanted to experiment with how we could utilise Docker’s overlay network to tunnel traffic between the nodes in a Swarm outside of the container environment,

⚠️Important Note I don’t recommend running this setup in a production environment — it’s an interesting prototype, but gives no control over the bootstrap process (it essentially relies on brute-forcing a race condition on container startup) which can lead to unreliable and unpredictable behaviour. Several months ago I was