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    2.2.0 • Public • Published

    aws-alb-lambda module

    Stability: Experimental

    All classes are under active development and subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

    Reference Documentation: https://docs.aws.amazon.com/solutions/latest/constructs/
    Language Package
    Python Logo Python aws_solutions_constructs.aws_alb_lambda
    Typescript Logo Typescript @aws-solutions-constructs/aws-alb-lambda
    Java Logo Java software.amazon.awsconstructs.services.alblambda

    This AWS Solutions Construct implements an an Application Load Balancer to an AWS Lambda function

    Here is a minimal deployable pattern definition in Typescript:

      // Obtain a pre-existing certificate from your account
      const certificate = acm.Certificate.fromCertificateArn(
      const props: AlbToLambdaProps = {
        lambdaFunctionProps: {
          code: lambda.Code.fromAsset(`${__dirname}/lambda`),
          runtime: lambda.Runtime.NODEJS_14_X,
          handler: 'index.handler'
        listenerProps: {
          certificates: [ certificate ]
        publicApi: true
      new AlbToLambda(stack, 'new-construct', props);


    new AlbToLambda(scope: Construct, id: string, props: AlbToLambdaProps);


    Pattern Construct Props

    Name Type Description
    loadBalancerProps? elasticloadbalancingv2.ApplicationLoadBalancerProps Optional custom properties for a new loadBalancer. Providing both this and existingLoadBalancer is an error. This cannot specify a VPC, it will use the VPC in existingVpc or the VPC created by the construct.
    existingLoadBalancerObj? elasticloadbalancingv2.ApplicationLoadBalancer Existing Application Load Balancer to incorporate into the construct architecture. Providing both this and loadBalancerProps is an error. The VPC containing this loadBalancer must match the VPC provided in existingVpc.
    listenerProps? ApplicationListenerProps Props to define the listener. Must be provided when adding the listener to an ALB (eg - when creating the alb), may not be provided when adding a second target to an already established listener. When provided, must include either a certificate or protocol: HTTP
    targetProps? ApplicationTargetGroupProps Optional custom properties for a new target group. While this is a standard attribute of props for ALB constructs, there are few pertinent properties for a Lambda target.
    ruleProps? AddRuleProps Rules for directing traffic to the target being created. May not be specified for the first listener added to an ALB, and must be specified for the second target added to a listener. Add a second target by instantiating this construct a second time and providing the existingAlb from the first instantiation.
    vpcProps? ec2.VpcProps Optional custom properties for a VPC the construct will create. This VPC will be used by the new ALB and any Private Hosted Zone the construct creates (that's why loadBalancerProps and privateHostedZoneProps can't include a VPC). Providing both this and existingVpc is an error.
    existingLambdaObj? lambda.Function Existing instance of Lambda Function object, providing both this and lambdaFunctionProps will cause an error.
    lambdaFunctionProps? lambda.FunctionProps Optional user provided props to override the default props for the Lambda function.
    existingVpc? ec2.IVpc An existing VPC in which to deploy the construct. Providing both this and vpcProps is an error. If the client provides an existing load balancer and/or existing Private Hosted Zone, those constructs must exist in this VPC.
    logAlbAccessLogs? boolean Whether to turn on Access Logs for the Application Load Balancer. Uses an S3 bucket with associated storage costs.Enabling Access Logging is a best practice. default - true
    albLoggingBucketProps? s3.BucketProps Optional properties to customize the bucket used to store the ALB Access Logs. Supplying this and setting logAccessLogs to false is an error. @default - none
    publicApi boolean Whether the construct is deploying a private or public API. This has implications for the VPC and ALB.

    Pattern Properties

    Name Type Description
    vpc ec2.IVpc The VPC used by the construct (whether created by the construct or providedb by the client)
    loadBalancer elasticloadbalancingv2.ApplicationLoadBalancer The Load Balancer used by the construct (whether created by the construct or provided by the client)
    lambdaFunction lambda.Function Returns an instance of the Lambda function used in the pattern.
    listener elb.ApplicationListener The listener used by this pattern.

    Default settings

    Out of the box implementation of the Construct without any override will set the following defaults:

    Application Load Balancer

    • Creates or configures an Application Load Balancer with:
      • Required listeners
      • New target group with routing rules if appropriate

    AWS Lambda Function

    • Configure limited privilege access IAM role for Lambda function
    • Enable reusing connections with Keep-Alive for NodeJs Lambda function
    • Enable X-Ray Tracing
    • Set Environment Variables
      • AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)


    Architecture Diagram

    © Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.


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