digraph G {
    node [ shape=box ]
    rankdir=LR;

    label="CDN Traffic flow"

    subgraph cluster_homedc {
        label="HomeDC"


        kubemaster [ label="Kubernetes master nodes" ]
        kubeworker [ label="Kubernetes worker nodes" ]

        subgraph cluster_kubernetes {
            label="Kubernetes Workload"

            api [ label="APIs" ]
        }
    }
    kubemaster->kubeworker [ label="Controls" ]
    api->kubeworker [ label="Runs on" ]

    subgraph cluster_pops {
        label="PoP"

        servicenode [ label="Service Node" ]
        edgenode [ label="Edge nodes" ]

     }

}