bramalho/aws-lambda

AWS Lamda

An example on how to build an AWS Lamda in Python using Terraform

Requirements

• AWS account
• AWS CLI
• Python 3
• Terraform

AWS Account

• Create a free account at https://aws.amazon.com
• Login in https://console.aws.amazon.com and select your desired region (eu-west-1 - EU Ireland)
• Get your Access Key in Account Menu -> "My Security Credentials" -> "Identity and Access Management (IAM)" -> "Access keys" and save it somewhere secure :)

Python

• Install python in your machine (https://www.python.org/downloads)

Terraform

• Install terraform in your machine (https://www.terraform.io/downloads.html)

Lambda

1. In AWS console, go to "Services" -> "Lambda" and "Create function"
2. Give the function name
3. Runtime choose "Python 3.6"
4. In Permissions chose the basic lambda permissions role
5. And then Create function

Basic function

import json

def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': json.dumps({"message": "It works!"})
    }

AWS Credentials

• Install AWS CLI (https://docs.aws.amazon.com/cli/latest/userguide/install-macos.html)
• Configure AWS CLI

aws configure

AWS Access Key ID [None]: <YOUR KEY ID>
AWS Secret Access Key [None]: <YOUR ACCESS KEY>
Default region name [None]: eu-west-1
Default output format [None]: json

Terraform Configuration

• In your working directory, init terraform

terraform init

• Create the configuration file config.tf

provider "aws" {
  version = "~> 2.24"
  region  = "eu-west-1"
}

Apply your first lambda

• Create a zip file with your lambda (ie: functions/it_works.zip)
• Write your lambda definition (ie: terraform/lambda.tf)
• Plan it!

terraform plan

If everything is ok, you'll all the resources that are going to be create/updated/deleted.

• Apply it!

terraform apply

Go to teh AWS Console and you'll see your lamda that is created.

More about terraform lambda function More about terraform api gateway

Destroy

terraform destroy