---
layout: "aws"
page_title: "AWS: aws_lambda_function"
sidebar_current: "docs-aws-resource-lambda-function"
description: |-
  Provides a Lambda Function resource. Lambda allows you to trigger execution of code in response to events in AWS. The Lambda Function itself includes source code and runtime configuration.
---

# aws\_lambda\_function

Provides a Lambda Function resource. Lambda allows you to trigger execution of code in response to events in AWS. The Lambda Function itself includes source code and runtime configuration.

For information about Lambda and how to use it, see [What is AWS Lambda?][1]

## Example Usage

```
resource "aws_iam_role" "iam_for_lambda" {
    name = "iam_for_lambda"
    assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
EOF
}

resource "aws_lambda_function" "test_lambda" {
    filename = "lambda_function_payload.zip"
    function_name = "lambda_function_name"
    role = "${aws_iam_role.iam_for_lambda.arn}"
    handler = "exports.test"
    source_code_hash = "${base64sha256(file("lambda_function_payload.zip"))}"
}
```

## Argument Reference

* `filename` - (Optional) A [zip file][2] containing your lambda function source code. If defined, The `s3_*` options cannot be used.
* `s3_bucket` - (Optional) The S3 bucket location containing your lambda function source code. Conflicts with `filename`.
* `s3_key` - (Optional) The S3 key containing your lambda function source code. Conflicts with `filename`.
* `s3_object_version` - (Optional) The object version of your lambda function source code. Conflicts with `filename`.
* `function_name` - (Required) A unique name for your Lambda Function.
* `handler` - (Required) The function [entrypoint][3] in your code.
* `role` - (Required) IAM role attached to the Lambda Function. This governs both who / what can invoke your Lambda Function, as well as what resources our Lambda Function has access to. See [Lambda Permission Model][4] for more details.
* `description` - (Optional) Description of what your Lambda Function does.
* `memory_size` - (Optional) Amount of memory in MB your Lambda Function can use at runtime. Defaults to `128`. See [Limits][5]
* `runtime` - (Optional) Defaults to `nodejs`. See [Runtimes][6] for valid values.
* `timeout` - (Optional) The amount of time your Lambda Function has to run in seconds. Defaults to `3`. See [Limits][5]
* `vpc_config` - (Optional) Provide this to allow your function to access your VPC. Fields documented below. See [Lambda in VPC][7]
* `source_code_hash` - (Optional) Used to trigger updates. This is only useful in conjuction with `filename`.
  The only useful value is `${base64sha256(file("file.zip"))}`.

**vpc\_config** requires the following:

* `subnet_ids` - (Required) A list of subnet IDs associated with the Lambda function.
* `security_group_ids` - (Required) A list of security group IDs associated with the Lambda function.

## Attributes Reference

* `arn` - The Amazon Resource Name (ARN) identifying your Lambda Function.
* `last_modified` - The date this resource was last modified.
* `source_code_hash` - Base64-encoded representation of raw SHA-256 sum of the zip file
  provided either via `filename` or `s3_*` parameters

[1]: https://docs.aws.amazon.com/lambda/latest/dg/welcome.html
[2]: https://docs.aws.amazon.com/lambda/latest/dg/walkthrough-s3-events-adminuser-create-test-function-create-function.html
[3]: https://docs.aws.amazon.com/lambda/latest/dg/walkthrough-custom-events-create-test-function.html
[4]: https://docs.aws.amazon.com/lambda/latest/dg/intro-permission-model.html
[5]: https://docs.aws.amazon.com/lambda/latest/dg/limits.html
[6]: https://docs.aws.amazon.com/lambda/latest/dg/API_CreateFunction.html#SSS-CreateFunction-request-Runtime
[7]: http://docs.aws.amazon.com/lambda/latest/dg/vpc.html