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

• Serverless cronjob

Properties

• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html

Type: AWS::Lambda::Function
Properties:
  Architectures:
    - String
  Code:
    Code
  CodeSigningConfigArn: String
  DeadLetterConfig:
    DeadLetterConfig
  Description: String
  Environment:
    Environment
  EphemeralStorage:
    EphemeralStorage
  FileSystemConfigs:
    - FileSystemConfig
  FunctionName: String
  Handler: String
  ImageConfig:
    ImageConfig
  KmsKeyArn: String
  Layers:
    - String
  LoggingConfig:
    LoggingConfig
  MemorySize: Integer
  PackageType: String
  RecursiveLoop: String
  ReservedConcurrentExecutions: Integer
  Role: String
  Runtime: String
  RuntimeManagementConfig:
    RuntimeManagementConfig
  SnapStart:
    SnapStart
  Tags:
    - Tag
  Timeout: Integer
  TracingConfig:
    TracingConfig
  VpcConfig:
    VpcConfig

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)