What Is the Process for Deploying a Lambda Function Created From a Zip URL

Introduction

In this guide, we will walk through the process of deploying an AWS Lambda function created from a Zip URL using Pulumi in TypeScript. AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers. Pulumi is an Infrastructure as Code (IaC) tool that allows you to define and manage cloud resources using familiar programming languages. By combining these two powerful tools, we can easily deploy and manage our serverless applications.

Step-by-Step Explanation

Step 1: Set Up Pulumi Project

First, we need to set up a new Pulumi project. Run the following commands to create a new directory for your project and initialize a new Pulumi TypeScript project:

mkdir pulumi-lambda-typescript
cd pulumi-lambda-typescript
pulumi new typescript

Step 2: Install AWS SDK

Next, we need to install the AWS SDK for Pulumi. Run the following command to install the necessary package:

npm install @pulumi/aws

Step 3: Define Lambda Function

Now, we will define our Lambda function in the index.ts file. We will use the aws.lambda.Function resource to create a new Lambda function from a Zip file URL. Here is the code to define the Lambda function:

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

const lambdaFunction = new aws.lambda.Function("myLambdaFunction", {
    runtime: aws.lambda.NodeJS12dXRuntime,
    code: new pulumi.asset.RemoteArchive("https://example.com/my-lambda-function.zip"),
    handler: "index.handler",
    role: myLambdaRole.arn,
});

Step 4: Create IAM Role

The Lambda function requires an IAM role with the necessary permissions. We will create an IAM role and attach the AWSLambdaBasicExecutionRole policy to it. Add the following code to your index.ts file:

const myLambdaRole = new aws.iam.Role("myLambdaRole", {
    assumeRolePolicy: {
        Version: "2012-10-17",
        Statement: [
            {
                Action: "sts:AssumeRole",
                Principal: {
                    Service: "lambda.amazonaws.com",
                },
                Effect: "Allow",
                Sid: "",
            },
        ],
    },
});

const lambdaPolicyAttachment = new aws.iam.RolePolicyAttachment("lambdaPolicyAttachment", {
    role: myLambdaRole.name,
    policyArn: aws.iam.ManagedPolicies.AWSLambdaBasicExecutionRole,
});

Step 5: Deploy the Stack

Finally, we will deploy the stack using the Pulumi CLI. Run the following command to deploy the resources defined in your Pulumi program:

pulumi up

Key Points

• AWS Lambda is a serverless compute service that allows you to run code without managing servers.
• Pulumi is an Infrastructure as Code tool that lets you define and manage cloud resources using programming languages.
• We used the aws.lambda.Function resource to create a Lambda function from a Zip file URL.
• An IAM role with the necessary permissions is required for the Lambda function to execute.
• The Pulumi CLI is used to deploy the stack and create the resources in your AWS account.

Conclusion

In this guide, we demonstrated how to deploy an AWS Lambda function created from a Zip URL using Pulumi in TypeScript. By following the step-by-step instructions, you can easily set up and manage your serverless applications using Pulumi. This approach allows you to leverage the power of Infrastructure as Code and the flexibility of AWS Lambda to build scalable and efficient serverless solutions.

Full Code Example

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

const myLambdaRole = new aws.iam.Role("myLambdaRole", {
    assumeRolePolicy: JSON.stringify({
        Version: "2012-10-17",
        Statement: [
            {
                Action: "sts:AssumeRole",
                Principal: {
                    Service: "lambda.amazonaws.com",
                },
                Effect: "Allow",
                Sid: "",
            },
        ],
    }),
});

const lambdaPolicyAttachment = new aws.iam.RolePolicyAttachment("lambdaPolicyAttachment", {
    role: myLambdaRole.name,
    policyArn: aws.iam.ManagedPolicies.AWSLambdaBasicExecutionRole,
});

const lambdaFunction = new aws.lambda.Function("myLambdaFunction", {
    runtime: aws.lambda.Runtime.NodeJS14dX,
    code: new pulumi.asset.RemoteArchive("https://example.com/my-lambda-function.zip"),
    handler: "index.handler",
    role: myLambdaRole.arn,
});

export const lambdaFunctionArn = lambdaFunction.arn;