graph.dot

digraph G {
  label = "Enterprise"
  rankdir = "TB";
  node [ shape="Mrecord" ]
  edge [ color="#555555"; dir="back"]

  subgraph cluster_1 {
    label = "Region: 1"
    color = "#000000"

    subgraph cluster_10 {
      label = "Zone: reporting"
      color = "#000000"

      subgraph cluster_101 {
        style = "rounded,filled"
        label = "Grand Master Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        db101 [ label="DB1" shape="custom" shapefile="db.png" color = "none"]
        ui101 [ label="{UI|worker}" ]
      }
    }
  }

  subgraph cluster_2 {
    label = "Region: 2"
    color = "#000000"

    subgraph cluster_0 {
      label = "Zone: West Coast"
      color = "#000000"

      subgraph cluster_201 {
        style = "rounded,filled"
        label = "Master Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        db201 [ label="DB2" shape="custom" shapefile="db.png" color = "none"]
        ui201 [ label="{UI|worker}" ]
        wk201 [ label="{C&U|worker}"]
        rep201[ label="{db sync|worker}" ]
      }

      subgraph cluster_202 {
        style = "rounded,filled"
        label = "Pawn Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        wk202a [ label="{Automate|worker}"]
        wk202b [ label="{C&U|worker}"]
      }
    }

    subgraph cluster_21 {
      label = "Zone: vSphere"
      color = "#000000"
      subgraph cluster_211 {
        style = "rounded,filled"
        label = "Pawn Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        ui211 [ label="{UI|worker}" ]
        wk211 [ label="{C&U|worker}"]
      }

      subgraph cluster_212 {
        style = "rounded,filled"
        label = "Pawn Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        wk212a [ label="{Automate|worker}"]
        wk212b [ label="{C&U|worker}"]

      }
    }
  }

  subgraph cluster_3 {
    label = "Region: 3"
    color = "#000000"

    subgraph cluster_30 {
      label = "Zone: East Coast"
      color = "#000000"

      subgraph cluster_301 {
        style = "rounded,filled"
        label = "Master Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        db301 [ label="DB3" shape="custom" shapefile="db.png" color = "none"]
        ui301 [ label="{UI|worker}" ]
        wk301 [ label="{C&U|worker}"]
        rep301[ label="{db sync|worker}" ]
      }

      subgraph cluster_302 {
        style = "rounded,filled"
        label = "Pawn Appliance"
        color = "#000000"
        fillcolor = "#dddddd"

        node [
          style="filled";
          color="#000000";
          fillcolor="#ffffff";
        ]
        wk302a [ label="{Automate|worker}"]
        wk302b [ label="{C&U|worker}"]
      }
    }
  }

    db101 -> ui101

    db201:s -> ui201:n
    db201:s -> wk201:n
    db201:s -> wk202a:n
    db201:s -> wk202b:n
    db201 -> ui211
    db201 -> wk211
    db201 -> wk212a
    db201 -> wk212b

    db301:s -> ui301:n
    db301:s -> wk301:n
    db301:s -> wk302a:n
    db301:s -> wk302b:n

    db101:s -> rep201:n
    rep201:s -> db201:n
    db101:s -> rep301:n
    rep301:s -> db301:n

    ui101:s -> ui201:n [dir="both"]
    ui101:s -> ui301:n [dir="both"]

/* just here to encourage a layout */
  subgraph cluster_l212 {
    label=""
    color=invis;
    edge [ color = "none"]
    ui201 -> ui211
  }
}