Learn how to deploy serverless applications with AWS Lambda

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Become an AWS Professional

AWS Lambda is a  serverless computing service which helps to run our code without any kind of server. Here you will learn the steps to deploy an AWS Serverless Application Model. By the end of this moddule, you will be ready to work with AWS Lambda in a professional setting, and you’ll have a great, transferable skill that employers will love to see.

Running Serverless Applications with AWS Lambda

_This chapter introduces the basic workflow of serverless deployments. You'll learn how to manage infrastructure with the AWS Serverless Application Model (SAM) and CloudFormation, and how to use API Gateway to send HTTP requests to Lambda functions._

## The SAM command-line tool
**SAM** command-line tools can generate sample projects and events so that you can get started easily. 

### The `sam init` command
Let's dive right in and create a sample web service backed by a Lambda function. You will use the `code` directory to execute the commands. To create a simple SAM project in a new subdirectory, run the following command:



# The SAM command-line tool
**SAM** command-line tools can generate sample projects and events so that you can get started easily. 

## The `sam init` command
Let's dive right in and create a sample web service backed by a Lambda function. You will use the `code` directory to execute the commands. To create a simple SAM project in a new subdirectory, run the following command:



sam init --runtime nodejs12.x --name app --app-template hello-world

You will be asked for the following permission:

```shell
Allow SAM CLI to download AWS-provided quick start templates from Github [Y/n]: 
```
Enter `y` as a response. You should get a quick confirmation about the initialisation of a new project:

```shell
Cloning app templates from https://github.com/awslabs/aws-sam-cli-app-templates.git 
-----------------------
Generating application:
-----------------------
Name: app
Runtime: nodejs12.x
Dependency Manager: npm
Application Template: hello-world
Output Directory: .
```

If this command printed an error on your local machine, there is some issue with the setup. You should look at the chapter where we have the information on how to set up SAM command-line tools and other prerequisites. 

In this lesson, you will learn how to initialize the web service project using AWS SAM. 

Before We Begin

Getting Started

Setup Tools for Local Development

Creating a Web Service

Development and Troubleshooting

Core Features of AWS Lambda

Handling HTTP Requests

Using External Storage

Cheaper, Faster, Serverless

Handling Platform Events

Using Application Components

Managing Sessions and User Workflows

Designing Robust Applications

Deployment Options

Conclusion

Initialising the Application

The SAM command-line tool #

The `sam init` command #