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AWS::Lambda::Function

  • Serverless! No servers to manage
  • Ideal to simple short executions
  • Run on demand with autoscaling
  • Lambda Container Image: it's an specify kind of container that is meant to be run on Lambda. It's different from the conventional docker image

Limits

  • Execution
  • Memory: 128 MB - 10 GB
  • Max duration: 15 min
  • Environment variables: 4 KB
  • Disk capacity (/tmp): 512 MB
  • Concurrent executions: 1000 (can be increased)
  • Deployment
  • Size (compressed .zip): 50 MB
  • Size (code + dependencies): 250 MB

Pricing

  • Pay per call
  • First 1M is free
  • After that, $0.20 per 1M
  • Pay per duration
  • First 400000 seconds / month is free (for 1GB RAM)

Integrations

  • API Gateway
  • Kineses
  • DynamoDB
  • S3
  • Cloudfront
  • CloudWatch Events
  • CloudWatch Logs
  • SNS
  • SQS
  • Cognito

Use cases

  • Thumbnail creation Thumbnail Creation

  • Serverless cronjob Cronjob

Properties

Code

import json

def lambda_handler(event, context):
    body = "Hello from Lambda!"
    statusCode = 200
    return {
        "statusCode": statusCode,
        "body": json.dumps(body),
        "headers": {
            "Content-Type": "application/json"
        }
    }

Role

  • By default, lambda functions has a role with policy able to write to CloudWatch

Runtime

  • Node.js
  • Python
  • Java
  • C#
  • Golang
  • Ruby
  • Custom Runtime API (enables any language, e.g., Rust)