Customers are often looking at running their services at global scale, deploying applications to multiple regions. While it has traditionally been hard to do this, often requiring months of engineering work, serverless has changed the game! This hands-on talk will help you understand how to build two different versions of a multi-region, active-active serverless backend. Come learn the pros-and-cons of DNS routing versus IP Anycast, and see how you can leverage serverless services like Route 53, Global Accelerator, API Gateway, the Application Load Balancer, AWS Lambda and DynamoDB Global tables to build global scale, serverless applications.

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N O R D I C S

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Building Global Services with
Serverless
Adrian Hornsby
Sr. Technical Evangelist
Amazon Web Services

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Why build a global architecture?

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Once upon a time …
Origin

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And Now …
Origin
~300ms

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Origin
Improve latency for end-users
Origin

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Improve availability and disaster recovery
Applications in
US West
Applications in
US East
Users from
San Francisco
Users from
New York
Service 1
Service 2
Service 3
Service 4
Service 1
Service 2
Service 3
Service 4

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Serverless cost model is a huge advantage here!

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Amazon Global Network

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Origin
Cross region VPC peering
Origin

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Amazon S3 cross-region replication
Bucket with
objects
Bucket with
objects

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Active-Active | Active-Passive | What to do?

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Build high performance, globally distributed applications
Low latency reads & writes to locally available tables
Disaster proof with multi-region redundancy
Easy to set up and no application rewrites required
Globally dispersed users
Replica (N. America)
Replica (Europe)
Replica (Asia)
Global App
Global Table
Amazon DynamoDB Global Tables
Fully managed, multi-master, multi-region database

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Amazon Aurora Serverless

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Multi-region with
Route 53

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Latency based routing
RegionRegion
Application Application

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Geo-based routing
Region us-east-1Region us-west-2
Application Application

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Weighted round robin routing
Region us-east-1Region us-west-2
Application Application

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DNS failover
Region us-east-1Region us-west-2
Application Application

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Route53: Traffic Policy

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Health checks with Route 53

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Region us-east-1
Region us-west-2
Global Table
https://global.adhorn.me

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Region us-east-1
Region us-west-2
Global Table

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Region us-east-1
Region us-west-2
Global Table

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Region us-east-1
Region us-west-2
https://globalddb.adhorn.me
Regional
API
Endpoint
Custom
Domain
Name
Regional
API
Endpoint
Custom
Domain
Name
API Gateway

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Region us-east-1
Region us-west-2
Global Table

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Region us-east-1
Region us-west-2
Global Table
https://globalddb.adhorn.me
Voilà!

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Amazon CloudFront AWS Lambda
Lambda@Edge
Lambda@Edge

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Write Once, Run Lambda Functions Globally
N Virginia
AWS Location
AWS Location
AWS Location
AWS Location
AWS Location
AWS Location

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Lambda@Edge Programming Model
exports.handler = (event, context, callback) => {
/* viewer-request and origin-request events
* have the request as input */
const request = event.Records[0].cf.request;
/* viewer-response and origin-response events
* have the response as input */
const response = event.Records[0].cf.response; */
/* Do the processing – say add a header */
/* When I am done I let CloudFront what to do next */
callback(null, request);
}

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#awssummit
Multi-region Setup

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#awssummit
Reduce latency for
global teams

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Lambda @ Edge
exports.handler = (event, context, callback) => {
const request = event.Records[0].cf.request;
const region = extractRegionCookieValue(request.headers);
if (region)
request.origin.custom.domainName = `${region}`-int.frontapp.com`
return request;
}

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AWS Global Accelerator

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Region eu-central-1
Region eu-west-2
Global Table
2x Anycast IPs
Global
Accelerator

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Region eu-central-1
Region eu-west-2
Global Table

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Region eu-central-1
Region eu-west-2
Global Table

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Region eu-central-1
Region eu-west-2
Global Table

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Region eu-central-1
Region eu-west-2
Global Table
2x Anycast IPs
Global
Accelerator
Voilà!

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DNS Issues

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https://medium.com/@adhorn

60. Thank you!
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Adrian Hornsby