The right way to create a Lambda in Terraform

To create an AWS Lambda operate utilizing Terraform, it’s essential outline the required sources in a Terraform configuration file. Right here’s an instance of how one can create a Lambda operate utilizing Terraform:

Possibility 1 – Seperate Lambda Supply

1. Create a brand new listing on your Terraform configuration and navigate to it in your terminal.
2. Create a brand new file with a .tf extension, equivalent to 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"  # Exchange together 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"  # Exchange together with your desired runtime

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

  // Exchange with the suitable values on 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 elements:

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

You may also 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 required sources, together with the Lambda operate.

Possibility 2 – Inline Lambda Supply

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

1. Comply with 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"  # Exchange together 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"  # Exchange together 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

  // Exchange with the suitable values on 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 might have now created an inline Lambda operate utilizing Terraform.