CloudFormation-更好地发现RDS DBSubnetGroup列表的EC2子网/AZ?

cfn-lint 这样做时,会抱怨硬编码可用性区域:

Resources:
  SubnetWest2a:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: us-west-2a
      CidrBlock: 10.0.0.0/24
      VpcId: !Ref GlobalVPC

  SubnetWest2b:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: us-west-2b
      CidrBlock: 10.0.1.0/24
      VpcId: !Ref GlobalVPC

  SubnetWest2c:
    Type: AWS::EC2::Subnet
    Properties:
      AvailabilityZone: us-west-2c
      CidrBlock: 10.0.2.0/24
      VpcId: !Ref GlobalVPC

所以我就这样做了:

Resources:
  #...
  SubnetWest1:
    Type: AWS::EC2::Subnet
    Properties:
      CidrBlock: 10.0.0.0/24
      VpcId: !Ref GlobalVPC
      AvailabilityZone: !Select
        - 0
        - Fn::GetAZs: !Ref 'AWS::Region'

  SubnetWest2:
    Type: AWS::EC2::Subnet
    Properties:
      CidrBlock: 10.0.1.0/24
      VpcId: !Ref GlobalVPC
      AvailabilityZone: !Select
        - 1
        - Fn::GetAZs: !Ref 'AWS::Region'

  SubnetWest3:
    Type: AWS::EC2::Subnet
    Properties:
      CidrBlock: 10.0.2.0/24
      VpcId: !Ref GlobalVPC
      AvailabilityZone: !Select
        - 2
        - Fn::GetAZs: !Ref 'AWS::Region'

但警告来自 Fn::GetAZs docs :

与descripe availability zones AWS CLI命令的响应类似,Fn::GetAZs函数的结果顺序不受保证,并且在添加新的可用性区域时可能会发生变化。

依赖于这些子网和CIDR块的节是:

GlobalDBSubnetGroup:
  Type: AWS::RDS::DBSubnetGroup
  Properties:
    DBSubnetGroupDescription: Multi-AZ RDS subnet group
    SubnetIds:
      - !Ref SubnetWest1
      - !Ref SubnetWest2
      - !Ref SubnetWest3

考虑到这两者相互排斥 最佳实践提示 ,有没有更好的发现方法 创造 这是一组相互依赖的资源,用于多个应用程序,并且每次运行堆栈时都会得到确定的结果?