Terraform AWS Lambda Function Deployment Example

In this tutorial, we will explore how to deploy an AWS Lambda function using Terraform. Terraform is a popular infrastructure as code tool that allows you to manage and provision infrastructure resources, including AWS Lambda functions. Before we dive into the deployment process, make sure you have a basic understanding of Terraform and AWS Lambda.

Prerequisites

To follow along with this tutorial, you will need to have the following prerequisites:

• Terraform installed on your machine
• An AWS account with the necessary credentials set up
• A basic understanding of Terraform and AWS Lambda

If you are new to Terraform, it’s recommended that you start with some beginner-friendly tutorials, such as our More Terraform Tutorials.

Step 1: Create an AWS Lambda Function

The first step in deploying an AWS Lambda function using Terraform is to create the function itself. We will use a simple Node.js function as an example.

exports.handler = async (event) => {
  console.log(event);
  const response = {
    statusCode: 200,
    body: JSON.stringify('Hello from Lambda!'),
  };
  return response;
};

Step 2: Create a Terraform Configuration File

Next, we need to create a Terraform configuration file that defines our AWS Lambda function. This file will contain the necessary code to provision our Lambda function.

provider "aws" {
  region = "us-west-2"
}

resource "aws_lambda_function" "example" {
  filename      = "lambda_function_payload.zip"
  function_name = "example_lambda"
  handler       = "index.handler"
  runtime       = "nodejs14.x"
  role          = aws_iam_role.lambda_exec.arn
}

resource "aws_iam_role" "lambda_exec" {
  name        = "example_lambda_exec"
  description = "Execution role for example lambda"

  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = "sts:AssumeRole"
        Effect = "Allow"
        Principal = {
          Service = "lambda.amazonaws.com"
        }
      },
    ]
  })
}

Step 3: Deploy the AWS Lambda Function

Now that we have our Terraform configuration file set up, we can deploy our AWS Lambda function using the Terraform apply command.

terraform init
terraform apply

Common Mistakes

When deploying an AWS Lambda function using Terraform, there are a few common mistakes to watch out for. One of the most common mistakes is forgetting to set the correct AWS region in your Terraform configuration file. Make sure to set the region to the correct value for your AWS account.

Another common mistake is not properly configuring the IAM role for your Lambda function. Make sure to set the correct assume role policy and attach the necessary policies to the role. For more information on IAM roles and policies, check out our Mastering SQL tutorial, which covers database security and access control.

Conclusion

In this tutorial, we explored how to deploy an AWS Lambda function using Terraform. We covered the prerequisites, created a Terraform configuration file, and deployed the Lambda function using the Terraform apply command. We also discussed some common mistakes to watch out for when deploying a Lambda function using Terraform.

By following this tutorial, you should now have a basic understanding of how to deploy an AWS Lambda function using Terraform. For more information on Terraform and AWS Lambda, check out our More Terraform Tutorials. If you’re interested in learning more about Java algorithms, visit our Java Algorithms page.