AWS Lambda - import to cloudformation. Required properties

Question

There is something that I don't understand in the concept of Cloudformation import feature.

I have a Lambda function, lets call it "myLambdaFunc". "myLambdaFunc" is running and working.

Now I want to create a cloudFormation-stack to deploy the same Lambda.

So I followed this article - "Bringing Existing Resources Into CloudFormation Management".

My cloud formation file look like this:

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources" : {
    "LambdaImportTest2" : {
        "Type" : "AWS::Lambda::Function",
        "DeletionPolicy" : "Delete",
        "Properties" : {
        }
    }
  }
}

But when trying to run the import in cloudFormation I get an "IMPORT_FAILED" error, because "Property Handler cannot be empty."

The error makes sense because the Property is empty.

But this is where my confusion starts - I try to import an existing Lambda. I don't want to define a new Lambda.. So what should I put in the Property handler? what code should I set there?

@AssaelAzran Thanks. I know this guide. But this is my problem: What do I put in the required property "Code"? I expect it to be the code from the already running Lambda. Isn't it the meaning of importing existing resources to cloudformation? — carmel
You created your lambda in your aws console. it is not a resource inside an existing cloud-formation stack. — Assael Azran
i thought you created your lambda locally and you want to import it. — Assael Azran
ok now i understand read this aws.amazon.com/blogs/aws/… try to omit properties field — Assael Azran

carmel carmel · Accepted Answer · 2019-11-14T10:37:42

Ok.. I think I figured out the confusion..

The main goal of the import process is to import the existing resource configuration.

In the case of a Lambda function - the main part of the resource is NOT the "Code" property. It can be copied manually from the existing Lambda.

When running the import I'll get the Lambda configuration in a cloudformation-stack, and I guess that is the main advantage in the import process, not needing to configure the resource by hand.

AWS Lambda - import to cloudformation. Required properties

1 Answers