如何使用 AWS SAM 更新现有 lambda function

Question

I have some lambda functions that have been created before moving to AWS SAM. I would like to update my existing lambda function using AWS SAM. What would be the process of referencing the lambda function in AWS SAM. I have a lambda function already created called: hello.

How would I update the lambda function using AWS SAM? below is my sam template.yaml file

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: CD Demo Lambda
Resources:
  hello:
    Type: 'AWS::Serverless::Function'
    Properties:
      Handler: lambda_function.lambda_handler
      Runtime: python3.7
      CodeUri: ./s3lambda
      FunctionName: hello
      MemorySize: 128
      Timeout: 03       

Answer 1

As AWS SAM uses Cloudformation for deploying resources.

You need to import the lambdas Importing existing resources into a stack in the cloudformation stack.

Answer 2

The documentation states that you cannot import resources to AWS SAM Templates.