How to update existing lambda function using AWS SAM

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

samtoddler · Accepted Answer · 2021-01-27 19:18:07Z

-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.

answered Jan 27, 2021 at 19:18

samtoddler

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3 Comments

Bilal Yousaf Over a year ago

thank you for your response. just one question: how would I reference the stack in the template.yaml file?

samtoddler Over a year ago

as per the documentation, you start with the template. >During this import, you need to provide a template that describes the entire stack, including the target resources. If existing stack resources are modified in the prepared template, the import fails.

Samwise Ganges Over a year ago

That's for importing existing lambda into an existing stack. How do you reference an existing lambda into a new stack when creating with sam deploy from a template file?

blackgreen · Accepted Answer · 2022-01-05 14:08:16Z

-1

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

edited Jan 5, 2022 at 14:08

blackgreen♦

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answered Jan 5, 2022 at 14:05

Pankaj Dhariwal

1

Comments

Juan Paulo Pérez-Tejada · Accepted Answer · 2023-09-01 06:04:23Z

-1

The answers here are not so useful for beginners.

If you want to update your AWS Lambda function using SAM-CLI, I guess that you already deployed a function with sam deploy --guided command. SAM helped you to deploy your app with CloudFormation and saved the configuration in the samconfig.toml file.

Next time you can deploy your app just by giving the stack-name and (at least in my case) the S3 Bucket where your Lambda Function is placed.

sam deploy --stack-name YOUR-APP-NAME --s3-bucket YOUR-BUCKET-NAME

answered Sep 1, 2023 at 6:04

Juan Paulo Pérez-Tejada

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