Lambda
/SKILLFonctions sans serveur AWS Lambda pour le traitement piloté par les événements. À utiliser lors de la création de fonctions, de la configuration des déclencheurs, du débogage des invocations, de
name: lambda
description: AWS Lambda serverless functions for event-driven compute. Use when creating functions, configuring triggers, debugging invocations, optimizing cold starts, setting up event source mappings, or managing layers.
last_updated: "2026-01-07"
doc_source: https://docs.aws.amazon.com/lambda/latest/dg/
AWS Lambda
AWS Lambda runs code without provisioning servers. You pay only for compute time consumed. Lambda automatically scales from a few requests per day to thousands per second.
Table of Contents
Core Concepts
Function
Your code packaged with configuration. Includes runtime, handler, memory, timeout, and IAM role.
Invocation Types
| Type | Description | Use Case |
|---|---|---|
| Synchronous | Caller waits for response | API Gateway, direct invoke |
| Asynchronous | Fire and forget | S3, SNS, EventBridge |
| Poll-based | Lambda polls source | SQS, Kinesis, DynamoDB Streams |
Execution Environment
Lambda creates execution environments to run your function. Components:
- Cold start: New environment initialization
- Warm start: Reusing existing environment
- Handler: Entry point function
- Context: Runtime information
Layers
Reusable packages of libraries, dependencies, or custom runtimes (up to 5 per function).
Common Patterns
Create a Python Function
AWS CLI:
# Create deployment package
zip function.zip lambda_function.py
# Create function
aws lambda create-function \
--function-name MyFunction \
--runtime python3.12 \
--role arn:aws:iam::123456789012:role/lambda-role \
--handler lambda_function.handler \
--zip-file fileb://function.zip \
--timeout 30 \
--memory-size 256
# Update function code
aws lambda update-function-code \
--function-name MyFunction \
--zip-file fileb://function.zipboto3:
import boto3
import zipfile
import io
lambda_client = boto3.client('lambda')
# Create zip in memory
zip_buffer = io.BytesIO()
with zipfile.ZipFile(zip_buffer, 'w') as zf:
zf.writestr('lambda_function.py', '''
def handler(event, context):
return {"statusCode": 200, "body": "Hello"}
''')
zip_buffer.seek(0)
# Create function
lambda_client.create_function(
FunctionName='MyFunction',
Runtime='python3.12',
Role='arn:aws:iam::123456789012:role/lambda-role',
Handler='lambda_function.handler',
Code={'ZipFile': zip_buffer.read()},
Timeout=30,
MemorySize=256
)Add S3 Trigger
# Add permission for S3 to invoke Lambda
aws lambda add-permission \
--function-name MyFunction \
--statement-id s3-trigger \
--action lambda:InvokeFunction \
--principal s3.amazonaws.com \
--source-arn arn:aws:s3:::my-bucket \
--source-account 123456789012
# Configure S3 notification (see S3 skill)Add SQS Event Source
aws lambda create-event-source-mapping \
--function-name MyFunction \
--event-source-arn arn:aws:sqs:us-east-1:123456789012:my-queue \
--batch-size 10 \
--maximum-batching-window-in-seconds 5Environment Variables
aws lambda update-function-configuration \
--function-name MyFunction \
--environment "Variables={DB_HOST=mydb.cluster-xyz.us-east-1.rds.amazonaws.com,LOG_LEVEL=INFO}"Create and Attach Layer
# Create layer
zip -r layer.zip python/
aws lambda publish-layer-version \
--layer-name my-dependencies \
--compatible-runtimes python3.12 \
--zip-file fileb://layer.zip
# Attach to function
aws lambda update-function-configuration \
--function-name MyFunction \
--layers arn:aws:lambda:us-east-1:123456789012:layer:my-dependencies:1Invoke Function
# Synchronous invoke
aws lambda invoke \
--function-name MyFunction \
--payload '{"key": "value"}' \
response.json
# Asynchronous invoke
aws lambda invoke \
--function-name MyFunction \
--invocation-type Event \
--payload '{"key": "value"}' \
response.jsonCLI Reference
Function Management
| Command | Description |
|---|---|
aws lambda create-function | Create new function |
aws lambda update-function-code | Update function code |
aws lambda update-function-configuration | Update settings |
aws lambda delete-function | Delete function |
aws lambda list-functions | List all functions |
aws lambda get-function | Get function details |
Invocation
| Command | Description |
|---|---|
aws lambda invoke | Invoke function |
aws lambda invoke-async | Async invoke (deprecated) |
Event Sources
| Command | Description |
|---|---|
aws lambda create-event-source-mapping | Add event source |
aws lambda list-event-source-mappings | List mappings |
| `a |
