HostStatus.dot

digraph HostStateMachine {
    graph [nodesep = "1.0", ranksep = "1.0"];
    node [style = filled];
    compound = true;
    newrank = false;

    start [shape = house, color = coral];
    subgraph cluster_level1 {
        "pending-for-input" [color = gold2]
        discovering [color = gold2];
        known [color = cadetblue3];
        insufficient [color = lightpink];
    }
    disconnected [color = plum];
    disabled [color = grey70];
    subgraph cluster_level2 {
        "preparing-for-installation" [color = darkolivegreen3];
        installing [color = darkolivegreen3];
        "installing-in-progress" [color = darkolivegreen3]
    }
    "installing-pending-user-action" [color = cornsilk]
    installed [shape = doublecircle, color = chartreuse];
    error [shape = doublecircle, color = crimson];
    cancelled [shape = doublecircle, color = slategray];
    subgraph cluster_level3 {
        resetting [color = aquamarine3]
        "resetting-pending-user-action" [color = yellow]
    }

    start -> discovering [label = "host\nregistered", color=goldenrod, fontcolor=goldenrod];

    discovering -> disconnected [label = "no ping\n3 minutes", color=plum3, fontcolor=plum3, ltail = cluster_level1];
    discovering -> "pending-for-input" [label = "user input required", color=goldenrod, fontcolor=goldenrod];
    discovering -> known [label = "received\nall info", color=cadetblue4, fontcolor=cadetblue4];
    discovering -> insufficient [label = "minimum\nrequirements\nnot satisfied", color=lightpink3, fontcolor=lightpink3];
    discovering -> disabled [label = "user\ndisables", color=grey29, fontcolor=grey29, ltail = cluster_level1];

    "pending-for-input" -> known [label = "received\nall info", color=cadetblue4, fontcolor=cadetblue4];
    "pending-for-input" -> insufficient [label = "minimum\nrequirements\nnot satisfied", color=lightpink3, fontcolor=lightpink3];

    known -> "preparing-for-installation" [label = "installation\nstarted", color=darkolivegreen4, fontcolor=darkolivegreen4];
    known -> insufficient [label = "insufficient for role", color=lightpink3, fontcolor=lightpink3];

    disconnected -> discovering [label = "received\nping", color=goldenrod, fontcolor=goldenrod];
    disconnected -> disabled [label = "user\ndisables", color=grey29, fontcolor=grey29];

    disabled -> discovering [label = "user\nenables", color=goldenrod, fontcolor=goldenrod];

    insufficient -> known [label = "sufficient for role", color=cadetblue4, fontcolor=cadetblue4];

    "preparing-for-installation" -> installing [color=darkolivegreen3];
    "preparing-for-installation" -> error [label = "installation\nerror", color=crimson, fontcolor=crimson, ltail = cluster_level2];
    "preparing-for-installation" -> cancelled [label = "cancel", color=slategray, fontcolor=slategray, ltail = cluster_level2];

    installing -> "installing-in-progress" [color=darkolivegreen3];

    "installing-in-progress" -> installed [label = "installation\ncompleted", color=chartreuse4, fontcolor=chartreuse4];
    "installing-in-progress" -> "installing-pending-user-action" [label = "wrong boot\norder", color=cornsilk4, fontcolor=cornsilk4];

    "installing-pending-user-action" -> installed [label = "boot from\ninstall disk", color=chartreuse4, fontcolor=chartreuse4];

    cancelled -> resetting [label = "reset", color=aquamarine4, fontcolor=aquamarine4];

    resetting -> discovering [color=goldenrod, fontcolor=goldenrod, ltail = cluster_level3];
    resetting -> "resetting-pending-user-action" [label = "wrong boot\norder", color=yellow3, fontcolor=yellow3];
 
    installed -> error [label = "installation", color=crimson, fontcolor=crimson, ltail = cluster_level2];
    installed-> cancelled [label = "cancel", color=slategray, fontcolor=slategray, ltail = cluster_level2];

    error -> cancelled [label = "cancel", color=slategray, fontcolor=slategray, ltail = cluster_level2];

    {rank=min; start}
    {rank=max; installed}
    {rank=same; disconnected; disabled}
    {rank=same; "pending-for-input"; discovering}
    {rank=same; insufficient; known}
}