Kubernetes has a requirement that containers (more accurately "pods") can connect via a "flat networking space". How this is achieved varies between deployments

Kubernetes has a requirement that containers (more accurately "pods") can connect via a "flat networking space". How this is achieved varies between deployments, flannel, calico and weave are all common approaches. Kelsey Hightower's "Kubernetes the Hard Way" simply configured it at the router level: https://github.com/kelseyhightower/kubernetes-the-hard-way/blob/master/docs/07-network.md https://github.com/kelseyhightower/kubernetes-the-hard-way/b...