ports.dot

digraph G {
  rankdir=LR;
  graph [fontname = "Source Sans Pro"];
  node [fontname = "Source Sans Pro"];
  edge [fontname = "Source Sans Pro"];

  local [ label="Local\nport" ];
  machine [ label="Machine\nport" ];
  container [ label="Container\nport" ];
  subgraph cluster_VM {
    rankdir=LR;
    style=filled;
    color=lightskyblue;
    machine container;
    label = "Hypervisor";
  }
  local -> machine [ label="ssh -L" ];
  machine -> local [ label="ip" ];
  machine -> container [ label="publish" ];
}