AWS lambdas - deploy quickstart

In

How to create a layer

Example to create a Pandas python layer

  1. Create a directory called python, and install a library locally via pip: 
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    mkdir python
    cd python
    pip install -t pandas .
  2. Zip it on a parent folder. 
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    zip -r pandas_layer.zip .
    # Your zip file should have a folder named python with all content inside
  3. Upload your pandas_layer.zip to your s3 bucket.
  4. Next, deploy the AWS SAM template to create the layer: 
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    sam deploy --guided
    For the Stack name, enter aws-sdk-layer. Enter your preferred AWS Region and accept the other defaults.
  5. After the deployment completes, the new Lambda layer is available to use. Check the available layers:
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    aws lambda list-layers

Example to create an AWS SDK nodeJS layer:

  1. Clone this blog post’s GitHub repo. From a terminal, execute: 
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    git clone https://github.com/aws-samples/aws-lambda-layers-aws-sam-examples
    # install it
    cd ./aws-sdk-layer
    npm install
  2. Create the layer directory defined in the AWS SAM template and the nodejs directory required by Lambda. Next, move the node_modules directory: 
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    mkdir -p ./layer/nodejs
    mv ./node_modules ./layer/nodejs
  3. On the AWS Console, navigate to “Lambda -> Layers” and create a layer. You may test its reference works with some dummy code like: 
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    import json
    import pandas as pd

    def lambda_handler(event, context):
        
        series = pd.Series([2, 4, 6, 8])
        return {
            'statusCode': 200,
            'body': json.dumps('Hello from Pandas, max value is  '
                + str(series.max()) )
        }

How to create a lambda which uses layers

  1. Upload your lambda code on a zip to an S3 bucket.
  2. If you don’t need the layers, just remove them from the template, just like the X-Ray part. Then deploy this template on CloudFormation.
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AWSTemplateFormatVersion: '2010-09-09'
Description: "This stack creates a Lambda function that gets its code from an S3 bucket and makes use of 2 different Lambda layers"
Parameters:
  LambdaBucket:
    Description: S3 URI where the Lambda code zip will be located.
    Type: String
    Default: org-env-account-stack-templates-s3
  LambdaDescription:
    Description: Description of the Lambda Function.
    Type: String
    Default: Lambda for tests.
  LambdaHandler:
    Description: Handler of the Lambda Function.
    Type: String
    Default: lambda_function.lambda_handler
  LambdaMemory:
    Description: Memory available to the Lambda Function.
    Type: Number
    Default: 832
  LambdaName:
    Description: Name of the Lambda function.
    Type: String
    Default: TestLambda
  LambdaObject:
    Description: Name of the zip file that includes the Lambda code.
    Type: String
    Default: MyTest/Lambda_Test.zip
  LambdaObjectVersion:
    Description: Version of the Lambda code.
    Type: String
    Default: abcdeFGHij12LmN3opqRSTuV45wx67yz    
  LambdaRole:
    Description: IAM role with permissions required to execute the Lambda function.
    Type: String
    Default: arn:aws:iam::123456789012:role/service-role/ChromelessTest-role-a1bcd2ef
  LambdaRuntime:
    Description: IAM role with permissions required to execute the Lambda function.
    Type: String
    Default: python3.7  
  LambdaTimeout:
    Description: Timeout (in seconds) to execute the Lambda Function.
    Type: Number
    Default: 63
  TracingMode:
    Description: Tracing mode for integration with AWS X-Ray if needed.
    Type: String
    Default: Active
  LambdaLayer1:
    Description: ARNs of the layers that will be applied to the Lambda function, in case you need dependencies.
    Type: String
    Default: arn:aws:lambda:eu-west-1:123456789012:layer:LambdaInsightsExtension:10
  LambdaLayer2:
    Description: ARNs of the layers that will be applied to the Lambda function, in case you need dependencies.
    Type: String
    Default: arn:aws:lambda:eu-west-1:01234567890:layer:selenium-python-dependencies:12
Resources:
  LambdaFunction:
      Type: 'AWS::Lambda::Function'
      Properties:
          MemorySize: !Ref LambdaMemory 
          Description: !Ref LambdaDescription 
          TracingConfig:
              Mode: !Ref TracingMode
          Timeout: !Ref LambdaTimeout
          Code:
              S3ObjectVersion: !Ref LambdaObjectVersion
              S3Bucket: !Ref LambdaBucket
              S3Key: !Ref LambdaObject
          Role: !Ref LambdaRole
          Handler: !Ref LambdaHandler
          FunctionName: !Ref LambdaName
          Runtime: !Ref LambdaRuntime #"python3.7"
          PackageType: "Zip"
          Layers:
              - !Ref LambdaLayer1 #LayerInsights
              - !Ref LambdaLayer2 #LayerSeleniumPython