Rethinking Application Design for the Cloud

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Rethinking application design for the CloudCyrille Le Clerc


Speaker

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Cyrille Le Clerc

@cyrilleleclerc

Open Source

CTO

DevOps, Infra as Code Continuous Delivery

Solution Architect

Cloud


You ?

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Dev? Ops? Java? Cloud?


Cloud, IaaS, SaaS, PaaS

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Infrastructure as a Service

Platform as a Service

Software as a Service

Linux + storage + network

App runtime + middleware

Managed“Traditional” admin

Business App

Managed

Me


Agenda

• Paradigm Shift: Cloud Services Oriented Architecture

• Design Patterns for the Cloud

• Building Applications on the Cloud: Continuous Delivery

• Conclusion

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Paradigm Shift Cloud Services Oriented Architecture

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*aaS Ecosystem

• *aaS is about service, not software

• Integrate services, don’t try to setup your own infrastructure

• Amazon AWS: the place to be for *aaS

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*aaS Ecosystem

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Location and Colocation

• Collocate application and databases

• Some systems can be distant

• Choose your cloud according to the services you require

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Fallacies of

Distributed

Computing


US EU Safe Harbor

The Cloud & The Law

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We self-certify compliance with

Personally Identifiable Information

I’m not a

lawyer!!!

Payment Card Industry Data Security Standard (PCI DSS)

Applicable Law

Data Privacy

Liability

Data Portability and Reversibility

Compliance

SSAE 16

HIPAA

ISO 27001


Pricing Model

• Pay-per-use vs. fixed price

• Beware of unbounded pricing models

• Prepare a credit card

• Pay-per-use vs budget

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Selection Criteria for a Service Provider

• Location

• Performances

• Reliability

• Legal

• Security

• Pricing model

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Design Patterns for the Cloud

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Scale Out

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Evolution Revolution


Scale Up

• Still possible, but up to a limit

• Not optimal

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M1 Small M1 Large M3 2 XLarge

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Then ???Low utilization!


M1 Extra Large

• 64 bits

• 15 Gb memory

• 4 Vcore, 2 cpu unit (~2.5Gh)

• 1.6 Tb HD !

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• aka « your desktop »

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Scale out

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Design for clustering

Scale as you need

Pay as you use


Fear the File System

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• Think multi instance

• Shared file system is difficult

• Best practice for any automated deployment

Fear the File System

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Local file system: ephemeral near-cache or replica


Local File System is Everywhere!

Local file system is everywhere!

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tomcat

app-x


Local File System is Everywhere!

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tomcat

app-x Config• Configuration files

• Full text search

Search

• Log files

Logs

• Media libraryMedia Library


Configuration file

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tomcat

app-x Config

System properties

Amazon S3


Log files

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tomcat

app-x

Logs

LOG


Full Text Search

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tomcat

app-x Search


Media Library

!

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• Direct access from end user

• Amazon S3 Security tokens

tomcat

app-x

Media Library

Amazon S3

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Latency matters!

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Latency Matters

• Inter Continental is common

• EU to us-east-1 latency: 120ms

tomcat

app-x

120ms

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Measure

• Chrome Dev Tools

• Google Pagespeed

• YSlow

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Improve

• HTTP Headers: Expires & Cache Control

• Content Delivery Network: AWS CloudFront, CloudFlare …

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tomcat

ecommerce


New High Availability Rules

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New High Availability Rules

• SAN is slow & not shareable

• Fast disk is “ephemeral”

• Multiple data centers are everywhere

• Servers and storage are infinite

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Amazon: regions & availability zones


Building Software on the Cloud Continuous Delivery

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• Git push • Build • Test • Ready for production • Production

• Git push • Build • Test • Deploy • Production

Continuous Delivery

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Integration Deployment Delivery

• Git push • Build • Test


Blue Green Deployment• Martin Fowler: http://

martinfowler.com/bliki/BlueGreenDeployment.html

• Zero Downtime

• Cloud Elasticity → 2x number of servers during deployment

• NoSQL is your friend

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http://martinfowler.com/bliki/BlueGreenDeployment.html


Conclusion

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Conclusion

• Cloud Services Oriented Architecture: big change

• Design patterns for the Cloud: mostly engineering best practices

• Start on the cloud with a green field application

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Ready for the Cloud! Questions?

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Rethinking Application Design for the Cloud

Technology

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