digraph G {
  node[shape=box];
  edge[headport=n];

  subgraph cluster {
    hitch
    lego
  }
  hitch -> varnish;
  varnish -> nginx;
  varnish -> pkb;
  varnish -> wizards;
  varnish -> rust_melbourne;
  varnish -> pleroma;
  varnish -> read_rust;
  varnish -> read_rust_leaf;
  varnish -> quotes;
  varnish -> dewpoint;
  pkb -> syncthing;
  read_rust -> postgresql:ne;
  wizards -> postgresql;
  rust_melbourne -> postgresql:ne;
  pleroma -> postgresql:ne;
}