Resources:
  Instance:
    Type: AWS::EC2::Instance
    Properties:
      AvailabilityZone: ap-northeast-1a
      ImageId: ami-XXXXXXXX
      InstanceType: t2.micro
      KeyName: キーペア名
      NetworkInterfaces:
        - AssociatePublicIpAddress: "true"
          DeviceIndex: "0"
          SubnetId: subnet-XXXXXXXX
          GroupSet:
           - sg-XXXXXXXX