python - 如何从 boto3 cloudformation describe_stack API 中仅获取 OutputKey？

Question

需要一些帮助!我正在尝试使用 boto3 部署 CloudFormation 堆栈。在 cloudformation 模板中，输出参数包含以下代码。当我运行describe_stack时，它会显示堆栈和所有属性的完整描述。如何从下面的 OutputKeys 中仅获取其中的一些？例如，如果我只想要 PublicDNS 或 PublicIP，该怎么办？

Outputs:
  InstanceId:
    Description: InstanceId of the newly created EC2 instance
    Value: !Ref EC2Instance
  AZ:
    Description: Availability Zone of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance
      - AvailabilityZone
  PublicDNS:
    Description: Public DNSName of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance
      - PublicDnsName
  PublicIP:
    Description: Public IP address of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance
      - PublicIp

Answer 1

您可以在 Stack 的帮助下执行以下操作(例如 PublicDNS) :

import boto3

session = boto3.Session(aws_access_key_id='', aws_secret_access_key=''...) 

cloudformation = session.resource('cloudformation')

stack = cloudformation.Stack('<your-stack-name>')

print(stack.outputs)

public_dns = ''

for output in stack.outputs:
    if output['OutputKey'] == 'PublicDNS':
        public_dns = output['OutputValue']
        break

print(public_dns)