How to Use a Docker Image as AWS Lambda?

In this guide, we will demonstrate how to use a Docker image as an AWS Lambda function using Pulumi in TypeScript. We will cover the key services involved, provide a step-by-step explanation of the process, highlight key points, and conclude with a summary.

Introduction

In this solution, we will use Pulumi to deploy an AWS Lambda function that runs a Docker image. AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers. By using a Docker image, you can package your application and its dependencies into a container, ensuring consistency across different environments. The key services involved in this solution are AWS Lambda, Amazon ECR (Elastic Container Registry), and Pulumi.

Step-by-Step Explanation

Step 1: Set Up Pulumi Project

1. Create a new directory for your Pulumi project and navigate to it.
2. Initialize a new Pulumi project using TypeScript.

Step 2: Create Docker Image

1. Write a Dockerfile for your application.
2. Build the Docker image locally.
3. Tag the Docker image for ECR.

Step 3: Push Docker Image to Amazon ECR

1. Create an ECR repository using Pulumi.
2. Authenticate Docker to the ECR registry.
3. Push the Docker image to the ECR repository.

Step 4: Create AWS Lambda Function

1. Create an IAM role for the Lambda function using Pulumi.
2. Create the Lambda function using the Docker image from ECR.

Step 5: Deploy the Pulumi Stack

1. Configure AWS credentials.
2. Deploy the Pulumi stack to create the resources.

Key Points

• AWS Lambda allows you to run code without managing servers.
• Docker images ensure consistency across different environments.
• Amazon ECR is used to store and manage Docker images.
• Pulumi simplifies the process of deploying cloud resources using code.

Conclusion

In this guide, we demonstrated how to use a Docker image as an AWS Lambda function using Pulumi in TypeScript. We covered the key services involved, provided a step-by-step explanation, highlighted key points, and concluded with a summary. By following these steps, you can easily deploy serverless applications using Docker images and Pulumi.

Full Code Example

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Create an ECR repository
const ecrRepository = new aws.ecr.Repository("my-ecr-repo");

// IAM role for the Lambda function
const lambdaRole = new aws.iam.Role("lambda-role", {
    assumeRolePolicy: {
        Version: "2012-10-17",
        Statement: [
            {
                Action: "sts:AssumeRole",
                Principal: {
                    Service: "lambda.amazonaws.com",
                },
                Effect: "Allow",
                Sid: ""
            }
        ]
    }
});

// Attach the AWSLambdaBasicExecutionRole policy to the role
new aws.iam.RolePolicyAttachment("lambda-role-policy-attachment", {
    role: lambdaRole.name,
    policyArn: "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
});

// Define the Lambda function
const lambdaFunction = new aws.lambda.Function("my-lambda-function", {
    packageType: "Image",
    imageUri: pulumi.interpolate`${ecrRepository.repositoryUrl}:latest`,
    role: lambdaRole.arn,
    timeout: 300,
    memorySize: 512,
});

// Export the Lambda function ARN and ECR repository URI
export const lambdaFunctionArn = lambdaFunction.arn;
export const ecrRepositoryUri = ecrRepository.repositoryUrl;