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AWS Secrets Manager

2 min read

AWS Secrets Manager

  • Newer service, meant for storing secrets
  • Capability to force rotation of secrets every X days
  • Automate generation of secrets on rotation (uses Lambda)
  • Integration with RDS
  • Secrets are encrypted using KMS
  • Mostly meant for RDS integration

Multi-Region Secrets

  • Replicate Secrets across multiple AWS Regions
  • Secrets Manager keeps read replicas in sync with the primary Secret
  • Ability to promote a read replica Secret to a standalone Secret

Using Secrets Manager with Python

class GetSecretWrapper:
    def __init__(self, secretsmanager_client):
        self.client = secretsmanager_client
 
 
    def get_secret(self, secret_name):
        """
        Retrieve individual secrets from AWS Secrets Manager using the get_secret_value API.
        This function assumes the stack mentioned in the source code README has been successfully deployed.
        This stack includes 7 secrets, all of which have names beginning with "mySecret".
 
        :param secret_name: The name of the secret fetched.
        :type secret_name: str
        """
        try:
            get_secret_value_response = self.client.get_secret_value(
                SecretId=secret_name
            )
            logging.info("Secret retrieved successfully.")
            return get_secret_value_response["SecretString"]
        except self.client.exceptions.ResourceNotFoundException:
            msg = f"The requested secret {secret_name} was not found."
            logger.info(msg)
            return msg
        except Exception as e:
            logger.error(f"An unknown error occurred: {str(e)}.")
            raise
  • Other type key-value pair 로 저장 시 get_secret_value_response 는 json 형식의 String 이 반환됨
  • json.loads() 로 dictionary 로 전환해 사용 가능
  • 물론 Lambda 에 할당된 IAM Role 에 GetSecrets permission 을 적용해야 호출 가능

AWS-Parameters-and-Secrets-Lambda-Extension

  • AWS Secrets Manager 는 API 호출 마다 비용이 발생함
  • 1M per 5USD 로 저렴해서 호출이 많이 발생하지 않는 경우 비용을 감수해도 무관
  • 호출이 많은 서비스 개발 시 Lambda Layer 에서 해당 Extension 을 통해 호출한 secrets 를 캐싱하여 사용 가능 + 응답속도 향상 역시 이점으로 챙길 수 있음

References

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