Connect a pre-existing role to AWS Lambda using the AWS Cloud Development Kit (CDK)

Seeking to assign an existing role to a lambda function created with CDK Here is what I am attempting:

  const role1 = iam.Role.fromRoleArn(this, 'Role', 'ARN', {
         mutable: true,
    });
 const lambda1 = new lambda.Function(this, 'lambda1', {
        runtime: lambda.Runtime.PYTHON_3_7,
        code: lambda.Code.asset('lambda/lambda1_function'),
        handler: 'lambda_function.lambda_handler',
        role:role1,
             reservedConcurrentExecutions: 1
    });

Encountering the following exception during cdk deploy:

The role defined for the function cannot be assumed by Lambda. (Service: AWSLambdaInternal; Status Code: 400; Error Code: InvalidParameterValueException; Request ID:

Any assistance in resolving this issue would be greatly appreciated. Note: I am using typescript [email protected]

Answer №1

According to the documentation for the parameter role:

The Lambda execution role.

This role is assumed by the function during execution and determines the permissions of the function. The Role must be able to be assumed by the 'lambda.amazonaws.com' service principal.

To accomplish this, grant permission to the lambda service:

role1.grant(new iam.ServicePrincipal("lambda.amazonaws.com"))

Answer №2

After analyzing the feedback, it was determined that the root cause of the problem lied in a faulty trust policy within the assigned role.

To address this issue, it was necessary to include lambda.amazonaws.com in the designated trust policy.

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