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我正在尝试在嵌套CloudFormation堆栈中重用旧的VPC和ELB模板。

VPC模板：

 {
   "AWSTemplateFormatVersion" : "2010-09-09",
   "Description" : "AppVPC",
   "Resources" : {
      "AppVPC" : {
         "Type" : "AWS::EC2::VPC",
         "Properties" : {
            "CidrBlock" : "10.100.0.0/16",
            "EnableDnsSupport" : "true",
            "EnableDnsHostnames" : "true",
            "InstanceTenancy" : "default",
            "Tags" : [ {"Key" : "Name", "Value" : "appvpc"} ]
         }
      },

      "Pub1" :{
        "Type" : "AWS::EC2::Subnet",
        "Properties" : {
          "VpcId" : { "Ref": "AppVPC" },
          "CidrBlock" : "10.100.64.0/26",
          "AvailabilityZone" : "us-east-1a",
          "Tags" : [ {"Key" : "Name", "Value" : "public-1"} ]
        }
      } ,

  "Outputs" : …