Serverless presentation

GOING SERVERLESS
DO SERVER-SIDE BETTER BY

DO SERVER-SIDE BETTER BY GOING SERVERLESS
OVERVIEW - OUTLINE
▸ What’s all the hype about serverless architectures?
▸ Focus on Node.js, AWS Lambda, & Serverless Framework
▸ Discuss the advantages, disadvantages & limitations of a
serverless architecture

OVERVIEW - TAKEAWAYS
▸ General understanding of
▸ Serverless Architectures
▸ Node.js
▸ AWS Lambda
▸ Serverless Framework
▸ The value they provide

ABOUT ME
▸ Jason Sich
▸ Software Developer at
ClickFunnels.com
▸ Experience in JavaScript, Node.js,
AWS, & Serverless Framework
▸ Not the best

SERVERLESS ARCHITECTURE - SUCH HYPE
▸ News & Social Media (Hacker News, Lobsters, Twitter
▸ Conferences (Serverless Conf US/London)
▸ Libraries/Frameworks (Serverless Framework, Apex,
Chalice, Zappa)
▸ AWS Flourish (Swagger for Lambda/API Gateway?)

SERVERLESS ARCHITECTURE - WHAT IS IT?
▸ Functions as a Service
▸ “custom code that’s run in ephemeral containers” - Mike
Roberts via martinfowler.com/articles/serverless.html
▸ Tightly coupled to providers infrastructure components
▸ e.g. API Gateway, S3
▸ Provides an easy integration point for providers

SERVERLESS ARCHITECTURE - WHAT’S SO COOL ABOUT IT?
▸ Pay for what you need
▸ Easily scales
▸ Don’t have to manage servers!
▸ Easy deployment

NODE.JS
▸ nodejs.org

NODE.JS - WHAT IS IT?
▸ JavaScript runtime built on V8 engine
▸ Node.js is not exclusive, but is pervasive
▸ AWS Lambda
▸ Azure Functions
▸ Google Cloud Functions
▸ iron.io

NODE.JS - WHAT’S COOL ABOUT IT?
▸ Event-driven, non-blocking I/O model
▸ Callbacks, Promises, Async/Await
▸ Typical use-cases for Serverless
▸ Scripted & Dynamic
▸ REPL
▸ Lots of existing libraries & tooling (aws-sdk)

NODE.JS - USAGE
▸ JavaScript is Ubiquitous (Server/Web Client/Mobile)
▸ Big companies using Node.js
▸ Walmart
▸ Uber
▸ PayPal
▸ Netﬂix

AWS LAMBDA - WHAT IS IT?
▸ Amazon’s AWS FaaS product

AWS LAMBDA - FEATURES
▸ Pay by millisecond
▸ Horizontal Scaling
▸ Supports Node.js, Python, & Java (JVM Languages)
▸ No need to manage servers
▸ More ﬂexible than PaaS
▸ Run Binaries, Temp Files, …

AWS LAMBDA - THE WHOLE CLOUD (AT LEAST AMAZONS)
▸ API Gateway
▸ IoT
▸ Kinesis
▸ DynamoDB
▸ S3
▸ Cloud Watch
▸ Alexa
▸ CodeCommit
▸ SNS
▸ MORE…

AWS LAMBDA - CONFIGURATION TOOLS
▸ AWS Web Console
▸ CloudFormation
▸ AWS CLI
▸ AWS SDK

AWS LAMBDA - CONFIGURATION OPTIONS
▸ Runtime Support (Node, Java, Python)
▸ Memory
▸ 1536 MB max
▸ Timeout
▸ 5 minutes max
▸ Triggers

AWS LAMBDA - CODE
▸ Inline coding using online editor
▸ S3 Zip
▸ Gotta package dependencies too

AWS LAMBDA - DEPLOYMENT
▸ Qualiﬁers
▸ Aliases (Prod, Stage, Dev, whatever…)
▸ Versions

AWS LAMBDA - INVOCATION
▸ AWS Web Console
▸ Event from Trigger Source
▸ AWS SDK
▸ Apps & other Lambdas
▸ API Gateway Endpoints
▸ Wizard!

AWS LAMBDA - OBSERVATION
▸ Debugging
▸ ¯_(ツ)_/¯
▸ Logging
▸ CloudWatch Logs
▸ Monitoring
▸ CloudWatch Metrics, Alarms & Dashboards

SERVERLESS FRAMEWORK
▸ www.serverless.com
▸ CLI tool to create & manage Serverless Projects

SERVERLESS FRAMEWORK - FUN FACTS
▸ Just hit v1.0
▸ $3 million in funding
▸ Source is Open
▸ Supports Node.js, Python, Java & More
▸ Other platforms than AWS coming soon (Serverless
Platform is in beta)

SERVERLESS FRAMEWORK - WHY?
▸ Helps organize & manage a serverless project
▸ Lambda creation, conﬁguration & deployment
▸ AWS resource management via CloudFormation stacks
▸ Setup of Lambdas to Events & Resources
▸ Project structure by Services

SERVERLESS FRAMEWORK - CONCEPTS
▸ Service
▸ Framework’s unit of organization (like a project)
▸ Deﬁnes the Functions along with the Events & Resources
they use

▸ Function
▸ AWS Lambda Function
▸ Can be independently deployed
▸ Should do a single thing (separate concerns)

▸ Resources
▸ AWS infrastructure components
▸ DynamoDB Table
▸ S3 Buckets
▸ SNS Topics
▸ Anything deﬁned by CloudFormation

▸ Events
▸ Anything that triggers an AWS Lambda Function to
execute
▸ ex: S3 Bucket Upload, CloudWatch Timer, …

SERVERLESS FRAMEWORK - CLI
$ serverless create --template aws-nodejs --path foo
$ cd foo
$ serverless deploy -v
$ serverless deploy function -f bar
$ serverless invoke -f bar -p ./event.json -l
$ serverless logs -f bar -t

SERVERLESS FRAMEWORK - CONFIGURATION
service: example
provider:
name: aws
stage: dev
region: us-east-1
runtime: nodejs4.3
memorySize: 128
timeout: 30
iamRoleStatements:
- Effect: "Allow"
Action:
- "lambda:InvokeFunction"
- 's3:PutObject'
- 's3:GetObject'
Resource: “*"

SERVERLESS FRAMEWORK - CONFIGURATION
functions:
echo:
handler: foo/index.handler
events:
- stream: arn:aws:dynamodb:region:xxx:table/foo/stream/…
resources:
Resources:
fooTable:
Type: AWS::DynamoDB::Table
Properties:
TableName: fooTable
KeySchema:
- AttributeName: baz

ALL TOGETHER NOW - THE GOOD
▸ Node.js
▸ Event-driven I/O model
▸ Ubiquitous
▸ Prevalent

▸ AWS Lambda
▸ Pay per millisecond
▸ No servers to manage
▸ Fairly ﬂexible (binaries, temp ﬁles, …)

▸ Serverless management from the command line
▸ Gives structure/conventions to FaaS project
▸ Stays out of your way during coding

ALL TOGETHER NOW - THE BAD
▸ Node.js
▸ Language & ecosystem are evolving quickly
▸ Async ﬁrst
▸ Lacking standard library

▸ AWS lambda limits

▸ AWS lambda
▸ Node v4.3
▸ Cold Start Time
▸ Response Times
▸ API Gateway, CloudFront Distribution, Lambda
▸ AWS Web Console is not fun to use

▸ AWS Lambda
▸ Debugging can be hard
▸ Statelessness
▸ Resource usage spikes
▸ Vendored dependencies

▸ Evolving quickly JAWS -> SF v0.5 -> SF v1.0
▸ May not play well with other infrastructure tools
▸ New, needs maturity

MORAL OF THE STORY
▸ Great if you are planning to AWS
▸ Can be cost effective vs running & managing a server
▸ Awesome for event handling

THE END
▸ Questions?
▸ Twitter: @jasich, @grdevnight
▸ Slides will get posted there

Serverless presentation

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