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Lambda

  • Lambda is a compute service where you can upload your code and create a lambda function.
  • AWS lambda takes care of provisioning and managing the servers that you use to run the code.
  • Removes the need to worry about hardware, Operating systems, application layers, etc. Just worry about code
  • Can be used as:
  • An event-driven compute service where AWS lambda runs your code in response to events.
    • Could be changes to data in s3, or dynamodb, etc
    • As compute service to respond to HTTP request using Amazon API Gateway
  • Languages supported by lambda
  • NodeJS
  • Java
  • Python
  • C#
  • Go
  • Ruby
  • Powershell

Lambda Pricing

  • Priced on number of request
  • First 1 million requests are free. Then $0.20 per 1 million request thereafter
  • Duration
  • Duration is calculated from time code begins executing until it returns or terminates
    • This is rounded up to the nearest 100ms
  • price also depends on amount of memoyr you allocate to your function ($0.00001667 per GB-second)

Lambda Highlights

  • No servers!
  • Continous Scaling
  • Super super cheap (A Cloud Gurus site is less than $1.00 a month)

Lambda Exam Tips

  • Lambda scales out (NOT up) automatically
  • Millions of functions running in parrallel
  • Will not increase memory the function uses
  • Lambda functions are independent (1 event = 1 function)
  • Lambda is serverless
  • Also remember it is a compute service
  • Know what services are serverless
  • Lambda
  • S3
  • API Gateway
  • DynamoDB
  • SNS
  • Kinesis
  • Lambda functions can trigger other lambda functions
  • 1 event can = x functions if function triggers other functions
  • Architectures can get extreamly complicated
  • AWS X-ray allows you to debug Lambda
  • Lambda can do things globally they are not limited to their regions
  • Know your triggers
  • Can have multiple versions of lambda functions### API Gateway

What is an API

  • An API is a an application programming interface
  • Takes request does sends it somewhere, gets a response then returns response to whoever made the original request.

Types of APIs

  • REST APIs (REpresentational State Transfer)
  • Uses JSON (typically)
  • SOAP APIs (Simple Object Access Protocol)
  • Uses XML

  • Not very simple## Serverless

  • Brief history

  • Data Center --> IAAS --> PAAS --> Containers --> Serverless
  • AWS released EC2 2006 (Birth Of IAAS)
  • Azure releases Platform As A Service (PAAS)
  • Then containers came about and gave lightweigh alternative to server
  • Lambda was release and serverless computing was born
    • No need to worry about anything but code
    • Every Alexa command is just Lambda speaking back
  • Latest version will always use $latest
  • Qualified version will use $latest, unqualified will not have it
  • Versions are immutable (CANNOT be changed)
  • CANNOT split traffic with $latest instead you need to create an alias to latest

Lambda Triggers (TODO)

Lambda Versioning

  • When versioning you can publish more than one version of your lambda functions
  • After version is published it is immutable
  • Latest is the only version that can be edited
  • ARN types:
  • Qualified ARN
    • Does Have version at the end
  • Unqualified ARN
    • Does not have version at end
  • Aliases can be used to point to lambda versions
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