vars.wf.json

{
  "Name": "vars",
  "Project": "YOURPROJECT",
  "Zone": "us-west1-a",
  "GCSPath": "gs://YOUR/GCS/PATH",
  "OAuthPath": "YOUR/CREDS.json",
  "Sources": {
    "startup": "../vm_creation/simple_vm_startup.sh"
  },
  "Vars": {
    "vm-name": "myvar"
  },
  "Steps": {
    "setup": {
      "CreateDisks": [
        {
          "Name": "foo-disk",
          "SourceImage": "projects/debian-cloud/global/images/family/debian-9",
          "SizeGb": "10",
          "Type": "pd-ssd"
        }
      ]
    },
    "run": {
      "CreateInstances": [
        {
          "Name": "${vm-name}",
          "Disks": [{"Source": "foo-disk"}],
          "MachineType": "n1-standard-1",
          "StartupScript": "startup"
        }
      ]
    },
    "wait": {
      "WaitForInstancesSignal": [{"Name": "${vm-name}", "Stopped": true}]
    }
  },
  "Dependencies": {
    "run": ["setup"],
    "wait": ["run"]
  }
}