amazon-web-services - Cloudformation 拆分和导入值

Question

我在 CloudFormation 中有 2 个堆栈。一种是创建一个带有几个子网的 vpc，这些子网将被导出以便在其他堆栈中使用。这个想法是让这些子网在其他堆栈中使用。vpc 堆栈正确导出值，但我无法将它们导入到第二个堆栈中，因为它使用字符串列表。

堆栈 1:

  PrivateSubnets:
    Description: "A list of the public subnets"
    Value: !Join [ ",", [ !Ref PrivateSubnet1, !Ref PrivateSubnet2 ]]
    Export:
      Name: !Sub "${StagingArea}-PrivateSubnets"
  
  PublicSubnet1:
    Description: "Reference to the publi subnet in the 1st Availability Zone"
    Value: !Ref PublicSubnet1

  PublicSubnet2: 
    Description: "A reference to the public subnet in the 2nd Availability Zone"
    Value: !Ref PublicSubnet2

  PrivateSubnet1:
    Description: "A reference to the private subnet in the 1st Availability Zone"
    Value: !Ref PrivateSubnet1
    Export:
      Name: !Sub "${StagingArea}-PrivateSubnet1"
  PrivateSubnet2: 
    Description: "A reference to the private subnet in the 2nd Availability Zone"
    Value: !Ref PrivateSubnet2
    Export:
      Name: !Sub "${StagingArea}-PrivateSubnet2"

当我尝试将 ImportValue 导入第二个堆栈时，它不起作用。下面的堆栈 2:

  DbSubnetGroup:
    Type: AWS::RDS::DBSubnetGroup
    Properties:
      DBSubnetGroupDescription: !Sub "${StagingArea} RDS DB Subnet Group"
      SubnetIds: 
        - !ImportValue 'Fn::Sub': '{$StagingArea}-PrivateSubnet1'
        - !ImportValue 'Fn::Sub': '{$StagingArea}-PrivateSubnet2'

是否可以将从第一个堆栈导出的值放入第二个堆栈？我尝试了各种选择，但似乎都不起作用。

Answer 1

Sub 是不正确(错误使用$)，最好遵循 docs并将语句分成两行:

        - Fn::ImportValue:
            !Sub '${StagingArea}-PrivateSubnet1'
        - Fn::ImportValue:
            !Sub '${StagingArea}--PrivateSubnet2'