seqdiag {
    node_width = 80;
    edge_length = 100;

    "Client"
    "Tacker-server"
    "Tacker-conductor"
    "VnfLcmDriver"
    "KubernetesInfraDriver"
    "TackerDB"
    "Kubernetes client"
    "Helm(MasterNode)"

    Client -> "Tacker-server"
      [label = "POST /vnf_instances/{vnfInstanceId}/instantiate"];
    "Tacker-server" -> "Tacker-conductor"
      [label = "trigger asynchronous task"];
    Client <-- "Tacker-server"
      [label = "Response 202 Accepted"];
    "Tacker-conductor" -> "VnfLcmDriver"
      [label = "execute VnfLcmDriver"];
    "VnfLcmDriver" -> "KubernetesInfraDriver"
      [label = "execute KubernetesInfraDriver"];
    "KubernetesInfraDriver" -> "TackerDB"
      [label = "get package info"];
    "KubernetesInfraDriver" <-- "TackerDB"
      [label = "return package info"];
    "KubernetesInfraDriver" -> "TackerDB"
      [label = "get MasterNode access information"];
    "KubernetesInfraDriver" <-- "TackerDB"
      [label = "return MasterNode access information"];
    "KubernetesInfraDriver" -> "Helm(MasterNode)"
      [label = "put Helm chart"];
    "KubernetesInfraDriver" <-- "Helm(MasterNode)"
      [label = ""];
    "KubernetesInfraDriver" -> "Helm(MasterNode)"
      [label = "create repository of Helm chart"];
    "KubernetesInfraDriver" <-- "Helm(MasterNode)"
      [label = ""];
    "KubernetesInfraDriver" -> "Helm(MasterNode)"
      [label = "Kubernetes resource create by helm chart"];
    "KubernetesInfraDriver" <-- "Helm(MasterNode)"
      [label = ""]
    "KubernetesInfraDriver" -> "Helm(MasterNode)"
      [label = "get manifest information"]
    "KubernetesInfraDriver" <-- "Helm(MasterNode)"
      [label = "return manifest information"]
    "KubernetesInfraDriver" -> "TackerDB"
      [label = "save manifest information"]
    "KubernetesInfraDriver" <-- "TackerDB"
      [label = ""]
    "KubernetesInfraDriver" -> "Kubernetes client"
      [label = "get pod status"]
    "KubernetesInfraDriver" <-- "Kubernetes client"
      [label = "return pod status"]
    "KubernetesInfraDriver" -> "TackerDB"
      [label = "save pod information"]
    "KubernetesInfraDriver" <-- "TackerDB"
      [label = ""]
    "VnfLcmDriver" <-- "KubernetesInfraDriver"
      [label = ""];
    "Tacker-conductor" <-- "VnfLcmDriver"
      [label = ""];

  }