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Function as a Service (FaaS)aka

Serverless Computing

AWS Lambda in ActionDanilo PocciaManning

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Function as a Service (FaaS)

§ Cloud provider • Manages infrastructure

• Manages software stack (OS, runtime)

• Handles provisioning

• Availability

• Scalability

§ Developer• Implements application as set of functions

• Functions run when certain events are triggered

• Web request

• File upload

• Alarm

• Database update

§ Examples:• AWS Lambda, Google Cloud Functions, IBM OpenWhisk, MSFT Azure Functions

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Lambda Execution Environment

§ Function runs inside an operating system container• Single OS runs multiple containers• Isolation ensures that only processes inside container are visible• Has its own file system /tmp

§ Runtimes: C#, Node.js, Java, Python

§ A container handles a single function/event at a time

§ Concurrent execution by container replication

§ Containers may be reused for subsequent function executions

§ Containers may be terminated at any time• Stateless• Store all persistent state outside of container

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Lambda Invocation Modalities

§ Synchronous (RequestResponse)

§ Asynchronous (Event)

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Lambda Application Architecture

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1st Lambda Function

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1st Lambda Function

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1st Lambda Function

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1st Lambda Function

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1st Lambda Function

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Lambda Function Testing Arguments

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Lambda Function Testing

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Lambda Command Line Interface (CLI)

§ Download from http://aws.amazon.com/cli

§ Configure credentials

Create access key on AWS Console

> aws configure

§ Call function

> aws lambda list-functions

> aws lambda invoke --function-name helloWorld --payload '{}' output.txt

> aws lambda invoke --function-name helloWorld --payload '{"name":"Eyal"}' output.txt

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Reacting to S3 Events

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Reacting to S3 Events

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Reacting to S3 Events

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Reacting to S3 Events

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Reacting to S3 Events

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Reacting to S3 Events

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Reacting to S3 Events

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Reacting to S3 Events

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Function as Web API

§ Amazon API Gateway can be integrated with Lambda§ Turn http request into Lambda events§ Maps each Lambda Event into a URL endpoint

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Function as Web API

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Function as Web API

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Function as Web API

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Function as Web API

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Function as Web API

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Function as Web API

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Function as Web API

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Function as Web API

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Function as Web API

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Zappa

• Deploy Python WSGI applications on AWS Lambda + API Gateway. • https://github.com/Miserlou/Zappa

• Steps:• Install and configure AWS CLI• Create flask directory structure• Create a python virtual environment:

> virtualenv -p python3.6 venv> source venv/bin/activate

• Install flask> pip install flask

• Install zappa> pip install zappa> zappa init

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Zappa

• zappa_settings.json

• Deploy application to AWS Lambda > zappa deploy dev

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