Cloudformation错误：属性值NetworkInterfaces必须是对象列表

Question

在CloudFormation模板中引用NetworkInterface时，我收到错误Value of property NetworkInterfaces must be a list of objects。

以下是相关部分：

MyAppNetworkInterface: Type: AWS::EC2::NetworkInterface Properties: SubnetId: !Ref SubnetPrivate

MyApp: Type: AWS::EC2::Instance Properties: InstanceType: t2.medium NetworkInterfaces: - !Ref MyAppNetworkInterface

Answer 1

您实际上可以直接从EC2主机引用网络接口。但语法略有不同：

MyAppNetworkInterface:
  Type: AWS::EC2::NetworkInterface
  Properties:
    SubnetId: !Ref SubnetPrivate

MyApp:
  Type: AWS::EC2::Instance
  Properties:
    InstanceType: t2.medium
    NetworkInterfaces:
    - NetworkInterfaceId: !Ref MyAppNetworkInterface
      DeviceIndex: 0

（见：http://docs.amazonaws.cn/en_us/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-network-interface.html#cfn-awsec2networkinterface-templateexamples）

Answer 2

你不能这样做。而是独立创建两个资源，然后连接网络接口附件资源。

http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-network-interface-attachment.html