AWS Lambda - Developer Guide

Developer Guide

AWS Lambda

Copyright ? 2024 Amazon Web Services, Inc. and/or its a?liates. All rights reserved.

AWS Lambda

Developer Guide

AWS Lambda: Developer Guide

Copyright ? 2024 Amazon Web Services, Inc. and/or its a?liates. All rights reserved.

Amazon's trademarks and trade dress may not be used in connection with any product or service

that is not Amazon's, in any manner that is likely to cause confusion among customers, or in any

manner that disparages or discredits Amazon. All other trademarks not owned by Amazon are

the property of their respective owners, who may or may not be a?liated with, connected to, or

sponsored by Amazon.

AWS Lambda

Developer Guide

Table of Contents

What is AWS Lambda? ....................................................................................................................

When to use Lambda ..................................................................................................................................

Key features ...................................................................................................................................................

Create your ?rst function ...............................................................................................................

Prerequisites ..................................................................................................................................................

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1

2

4

4

Create a Lambda function with the console .......................................................................................... 6

Invoke the Lambda function using the console .................................................................................. 12

Clean up ....................................................................................................................................................... 15

Additional resources and next steps ...................................................................................................... 16

Create your ?rst app ..................................................................................................................... 18

Prerequisites ................................................................................................................................................ 19

Downloading the example app ?les ...................................................................................................... 20

Deploying the app ..................................................................................................................................... 27

Deploy the resources manually .......................................................................................................... 27

Deploy the resources using AWS SAM ............................................................................................. 35

Testing the app ........................................................................................................................................... 37

Testing the app manually ................................................................................................................... 37

Testing the app with the automated script .................................................................................... 39

Next steps .................................................................................................................................................... 40

Key Lambda concepts .................................................................................................................... 42

Function ........................................................................................................................................................ 42

Trigger ........................................................................................................................................................... 42

Event ............................................................................................................................................................. 43

Execution environment ............................................................................................................................. 43

Deployment package ................................................................................................................................. 44

Runtime ........................................................................................................................................................ 44

Layer .............................................................................................................................................................. 44

Concurrency ................................................................................................................................................. 45

Quali?er ........................................................................................................................................................ 45

Destination ................................................................................................................................................... 45

Infrastructure as code (IaC) .......................................................................................................... 47

IaC tools for Lambda ................................................................................................................................. 47

Getting started with IaC for Lambda .................................................................................................... 49

Prerequisites ........................................................................................................................................... 50

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AWS Lambda

Developer Guide

Create a Lambda function .................................................................................................................. 50

View the AWS SAM template for your function ............................................................................. 50

Use AWS Application Composer to design a serverless application ........................................... 53

Deploy your serverless application using AWS SAM (optional) ................................................... 58

Testing your deployed application (optional) ................................................................................. 60

Next steps .................................................................................................................................................... 61

Supported regions for Lambda integration with Application Composer ........................................ 62

Programming model ..................................................................................................................... 63

Lambda runtimes ........................................................................................................................... 65

Supported runtimes ................................................................................................................................... 65

New runtime releases ................................................................................................................................ 68

Runtime deprecation policy ..................................................................................................................... 68

Shared responsibility model .................................................................................................................... 69

Runtime use after deprecation ............................................................................................................... 71

Receiving runtime deprecation noti?cations ........................................................................................ 72

Deprecated runtimes ................................................................................................................................. 73

Runtime version updates .......................................................................................................................... 76

Choosing a runtime update mode .................................................................................................... 77

Two-phase runtime version rollout ................................................................................................... 78

Rolling back a runtime version .......................................................................................................... 78

Identifying runtime version changes ................................................................................................ 80

Con?guring runtime management settings .................................................................................... 82

Understanding the shared responsibility model ............................................................................ 83

Controlling runtime update permissions for high-compliance applications ............................. 85

Get data about functions by runtime .................................................................................................... 86

Listing function versions that use a particular runtime ................................................................ 86

Identifying most commonly and most recently invoked functions ............................................ 88

Runtime modi?cations .............................................................................................................................. 93

Language-speci?c environment variables ........................................................................................ 93

Wrapper scripts ..................................................................................................................................... 93

Runtime API ................................................................................................................................................. 97

Next invocation ..................................................................................................................................... 97

Invocation response .............................................................................................................................. 99

Initialization error ................................................................................................................................. 99

Invocation error ................................................................................................................................... 101

OS-only runtimes ..................................................................................................................................... 103

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AWS Lambda

Developer Guide

Building a custom runtime ............................................................................................................... 104

Custom runtime tutorial ................................................................................................................... 107

Execution environment ............................................................................................................... 116

Runtime environment lifecycle ............................................................................................................. 117

Init phase .............................................................................................................................................. 117

Failures during the Init phase .......................................................................................................... 118

Restore phase (Lambda SnapStart only) ....................................................................................... 119

Invoke phase ........................................................................................................................................ 119

Failures during the invoke phase .................................................................................................... 120

Shutdown phase ................................................................................................................................. 122

Implementing statelessness ................................................................................................................... 123

Con?guring functions ................................................................................................................. 125

.zip ?le archives ........................................................................................................................................ 127

Creating the function ........................................................................................................................ 127

Using the console code editor ......................................................................................................... 129

Updating function code .................................................................................................................... 129

Changing the runtime ....................................................................................................................... 130

Changing the architecture ................................................................................................................ 130

Using the Lambda API ....................................................................................................................... 131

AWS CloudFormation ......................................................................................................................... 131

Container images ..................................................................................................................................... 133

Requirements ....................................................................................................................................... 134

Using an AWS base image ................................................................................................................ 135

Using an AWS OS-only base image ................................................................................................ 136

Using a non-AWS base image ......................................................................................................... 136

Runtime interface clients .................................................................................................................. 137

Amazon ECR permissions .................................................................................................................. 137

Function lifecycle ................................................................................................................................ 140

Memory ...................................................................................................................................................... 141

When to increase memory ............................................................................................................... 141

Using the console ............................................................................................................................... 142

Using the AWS CLI ............................................................................................................................. 142

Using AWS SAM .................................................................................................................................. 142

Accepting function memory recommendations (console) .......................................................... 143

Ephemeral storage ................................................................................................................................... 144

Use cases .............................................................................................................................................. 144

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