{
   "Type" : "AWS::EC2::Instance",
   "Properties" : {
      "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
      "KeyName" : { "Ref" : "KeyName" },
      "SecurityGroupIds" : [{ "Ref" : "WebSecurityGroup" }],
      "SubnetId" : { "Ref" : "SubnetId" },
      "NetworkInterfaces" : [ {
         "NetworkInterfaceId" : {"Ref" : "controlXface"}, "DeviceIndex" : "1" } ],
      "Tags" : [ {"Key" : "Role", "Value" : "Test Instance"}],
      "UserData" : { "Fn::Base64" : { "Ref" : "WebServerPort" }}
   }
}