Getting started w/ Serverless @ AWS UG

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Up, up and away Serverless on AWS Driss Amri @drissamri88

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Who is Driss Amri? Blogger at drissamri.com Co-Founder ServerlessDays Belgium Traveler & Diver

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Idea Customer

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Idea Dude, Where’s my feature? Customer

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Idea Request Servers Setup VMWares Customer Setup Network Security Functional testing Load testing Changing requirements Procurement new software Security testing

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Idea Request Servers Setup VMWares Setup Network Security Functional testing Load testing Changing requirements Procurement new software Security testing Customer

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Physical Servers Virtual Machines Containers Serverless Code Runtime OS Hardware

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“The Cloud”

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AWS

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Virtual Machines Code Runtime OS Hardware Infrastructure as a Service

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Code Runtime OS Hardware Container as a Service Containers

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Serverless Code/Data Runtime OS Hardware Serverless

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Technology is not the point

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Services are not the point

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Code is not the point

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Code is a liability

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AWS Lambda?

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Example: Favorite Service

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● First invocation ● After deployment or conﬁguration change ● Instances killed due to age ● Scaling out and existing instances busy Cold start frequency

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The Burning Monk - I’m afraid you’re thinking about AWS Lambda cold starts all wrong

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The Burning Monk - I’m afraid you’re thinking about AWS Lambda cold starts all wrong

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The Burning Monk - I’m afraid you’re thinking about AWS Lambda cold starts all wrong

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The Burning Monk - I’m afraid you’re thinking about AWS Lambda cold starts all wrong

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● NO: Most likely not when using Node.js, Go, Python, … ● MAYBE: Java (JVM) / .NET Are cold starts a big deal? * When used and optimized correctly

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● NO: Asynchronous architectures - Event-Driven architectures are a best practise ● NO: Batch processing ● NO: User facing service with normal traffic patterns* - No problem for 99th percentile ● MAYBE: User facing service with occasional traffic* ● MAYBE: User facing service with lots of spread spiky traffic* Are cold starts a big deal? (Java/.NET edition) * When used and optimized correctly

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● Keep function single purposed* ● Minimize dependencies - webpack, serverless-optimizer-plugin, … ● Use lightweight alternatives - Spring vs Dagger, Apache HTTP vs HttpUrlConnection ● Prefer low overhead runtime (Go, node.js, Python) - Consider GraalVM - … possibly consider Provisioned Concurrency Minimize bootstrap

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● Initialize as much as you can during startup - Static ﬁelds, constructor ● Move state to global - But keep your invocations stateless ● Avoid reﬂection ● Fail fast ● Right size memory usage - 1792 MB = 1 vCPU Optimize execution time

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● AWS re:Invent 2019: [REPEAT 1] Best practices for AWS Lambda and Java (SVS403-R1) @sapessi ... more on AWS Lambda and Java ● How to minimize AWS Lambda Java cold starts @drissamri88 ● Programming AWS Lambda by John Chapin, Mike Roberts ● Analyzing Cold Start latency of AWS Lambda @mikebroberts

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Infrastructure-as-code

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Infrastructure-as-code AWS ● Serverless Framework ● Terraform ● Pulumi ● CloudFormation ● Serverless Application Model (SAM) ● Cloud Development Kit (CDK) 3th party

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Serverless Framework ● Most widely used Serverless toolkit ● Released in 2015 ● Simple Developer Experience ● Focus on Functions, not Cloud Infrastructure ● Cloud-agnostic - AWS provider: - Compiles to CloudFormation - deployed as CloudFormation Stack

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Serverless Framework

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AWS SAM ● Official AWS deployment framework ● Released in 2016 ● Built on top of CloudFormation - Deployed as CloudFormation Stack

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AWS SAM

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AWS SAM CLI sam init --runtime java11 sam package \ --output-template-file packaged.yaml \ --s3-bucket bucketname sam deploy \ --template-file packaged.yaml \ --stack-name sam-app \ --capabilities CAPABILITY_IAM \ --region eu-west-1 aws cloudformation delete-stack --stack-name sam-app

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Cost control

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https://theburningmonk.com/2019/01/you-are-thinking-about-serverless-costs-all-wrong/ “You are thinking about serverless costs all wrong” - @theburningmonk

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https://forrestbrazeal.com/2020/01/05/code-wise-cloud-foolish-avoiding-bad-technology-choices/ “Code-wise, cloud-foolish: avoiding bad technology choices” - @forrestbrazeal

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Determining the Total Cost of Ownership of Serverless Technologies when compared to Traditional Cloud

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Resources ServerlessDays Belgium - Meetup Edition #1 YouTube - Join the meetup Presentations - Serverless - Lessons Learned - Nike Brown Bag