Learn how to create a Lambda in Terraform

To create an AWS Lambda operate utilizing Terraform, you should outline the mandatory assets in a Terraform configuration file. Right here’s an instance of how one can create a Lambda operate utilizing Terraform:

Choice 1 – Seperate Lambda Supply

1. Create a brand new listing to your Terraform configuration and navigate to it in your terminal.
2. Create a brand new file with a .tf extension, reminiscent of lambda.tf, and open it in a textual content editor.
3. Within the lambda.tf file, add the next code:

supplier "aws" {
  area = "us-east-1"  # Substitute along with your desired AWS area
}

useful resource "aws_lambda_function" "my_lambda" {
  function_name = "my-lambda-function"
  function          = aws_iam_role.lambda_role.arn
  handler       = "index.handler"
  runtime       = "nodejs14.x"  # Substitute along with your desired runtime

  // Substitute with the trail to your Lambda operate code
  filename      = "path/to/lambda/code.zip"

  // Substitute with the suitable values to your Lambda operate
  setting {
    variables = {
      KEY   = "VALUE"
      KEY2  = "VALUE2"
    }
  }
}

useful resource "aws_iam_role" "lambda_role" {
  title = "my-lambda-role"
  assume_role_policy = <<EOF
{
  "Model": "2012-10-17",
  "Assertion": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOF
}

useful resource "aws_iam_role_policy_attachment" "lambda_policy_attachment" {
  function       = aws_iam_role.lambda_role.title
  policy_arn = "arn:aws:iam::aws:coverage/service-role/AWSLambdaBasicExecutionRole"
}

4. Within the above code, you’ll be able to customise the next components:

• area: Specify the AWS area the place you wish to create the Lambda operate.
• runtime: Specify the runtime setting to your Lambda operate (e.g., nodejs14.x, python3.8, and so forth.).
• filename: Replace the trail to your Lambda operate code. Make sure that the code is packaged in a ZIP file.

You can even modify the setting variables part (KEY and VALUE) in accordance with your necessities.

5. Save the lambda.tf file.

6. Initialize the Terraform configuration by working the next command in your terminal:

terraform init

7. As soon as the initialization is full, you’ll be able to create the Lambda operate by working the next command:

terraform apply

Terraform will analyze the configuration, immediate for affirmation, after which create the mandatory assets, together with the Lambda operate.

Choice 2 – Inline Lambda Supply

An inline Lambda operate implies that the operate code is outlined straight within the Terraform configuration file as an alternative of referencing an exterior code file. Right here’s an instance of how one can create an inline Lambda operate utilizing Terraform:

1. Observe steps 1 and a couple of from the earlier reply to arrange your Terraform configuration.
2. Within the lambda.tf file, add the next code:

supplier "aws" {
  area = "us-east-1"  # Substitute along with your desired AWS area
}

useful resource "aws_lambda_function" "my_lambda" {
  function_name = "my-lambda-function"
  function          = aws_iam_role.lambda_role.arn
  handler       = "index.handler"
  runtime       = "nodejs14.x"  # Substitute along with your desired runtime

  // Outline the inline Lambda operate code
  inline_code = <<-EOT
    exports.handler = async operate(occasion, context) {
      console.log("Hey, inline Lambda operate!");
      return {
        statusCode: 200,
        physique: "Hey from inline Lambda!"
      };
    };
  EOT

  // Substitute with the suitable values to your Lambda operate
  setting {
    variables = {
      KEY   = "VALUE"
      KEY2  = "VALUE2"
    }
  }
}

useful resource "aws_iam_role" "lambda_role" {
  title = "my-lambda-role"
  assume_role_policy = <<EOF
{
  "Model": "2012-10-17",
  "Assertion": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOF
}

useful resource "aws_iam_role_policy_attachment" "lambda_policy_attachment" {
  function       = aws_iam_role.lambda_role.title
  policy_arn = "arn:aws:iam::aws:coverage/service-role/AWSLambdaBasicExecutionRole"
}

3. Customise the code as wanted, such because the area, function_name, runtime, and setting variables.
4. Save the lambda.tf file.
5. Initialize the Terraform configuration by working terraform init in your terminal.
6. As soon as the initialization is full, create the Lambda operate by working terraform apply.

Terraform will analyze the configuration, immediate for affirmation, and create the inline Lambda operate utilizing the code supplied within the inline_code block.

That’s it! You’ve got now created an inline Lambda operate utilizing Terraform.