continuous deployment demystified

Licensed Under Creative Commons by Naresh Jain

Continuous DeploymentEmbrace Continuous Improvement

Naresh Jain@nashjain

naresh@agilefaqs.comhttp://blogs.agilefaqs.com

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Continuous Deployment

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But....

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ROI?

Is there a p

roblem here?We a

re diffe

rent!

For us?Too much Chaos?Who? When?

Productivity?

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Me

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Mumbai

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Tech Talks!

AgilePhilly

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FitNesse ProTest

PatangLa"u

FitDecoratorDBFit

QWick

ProFIT

Panopticode

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Back in the Stone-age

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Hap

pine

ss/E

xcite

men

t

Time/Money/Opportunity Cost17

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Plan

Hap

pine

ss/E

xcite

men

t

Time/Money/Opportunity Cost17

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Plan

Design

Hap

pine

ss/E

xcite

men

t

Time/Money/Opportunity Cost17

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Plan

Design

Distribute

Hap

pine

ss/E

xcite

men

t

Time/Money/Opportunity Cost17

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Plan

Design

Distribute

Work in IsolationH

appi

ness

/Exc

item

ent

Time/Money/Opportunity Cost17

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Plan

Design

Distribute

Work in Isolation

Integrate

Hap

pine

ss/E

xcite

men

t

Time/Money/Opportunity Cost17

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Last Minute Integration Surprises

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BAD things were visible too Late...

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Birth of CI

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CI Helped Us Learn That... Life can Suck a lot Less!

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CI Helped Us Learn That... Life can Suck a lot Less!

Feedback Quality

Delivery Time Wastage

Collaboration

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If people are afraid to check-in frequently...your CI process is

NOT working.

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We already do CI.What’s next?

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Multi-Stage CI ProcessScaling CI using Build Promotion

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While the Lean-Start-up Community

They tried something quite disruptive...

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Continuous Deployment (CD)

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CD is quite natural for companies delivering

content via Web

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Licensed Under Creative Commons by Naresh JainFreeset - In Business for Freedom

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freesetglobal.com

Updates View

DB

StaticFiles

Stage 1

Freeset - In Business for Freedom30

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freesetglobal.com

Updates View

DB

StaticFiles

Stage 1

Structural

Changes

freesetglobal.com

Upda

tes View

DB

StaticFiles

Stage 2

dev.freesetglobal.com

DB

StaticFiles

Single-Click

Deploy

Sync

Freeset - In Business for Freedom30

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Freeset Demo

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Benefits of CD

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Automation removes Errors

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Eliminates stressful release crunch

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Users continuously see improvements

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Reducing batch size helps drive out waste

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Faster responses to customer issues

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A/B testing is easier due to less release

overhead

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Encourages experimenting with

new ideas

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Allows for fine-grained monitoring of changes

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Provides satisfaction from seeing constant

progress

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Can we embrace CD for eLearning?

Rich Multi-Media ContentVideo, Screencasts, Quizzes, Images, Personas, etc.

Programming ExercisesJava, C#, C++, C & Python

Mac OS, Windows, Linux, Solaris

Different IDE Plugins

Server side code analysis (Java, C#, C++, C & Python)

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This is what we did...

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Deploy build to inactive production servers

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Inactive joins the cluster

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Delivery tests verify inactive release

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Reverse proxy swaps inactive with active

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CD Requires Zero Downtime

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Zero Downtime Requires

• The application code

• Database schema

• Data files

• Web Server

• Application Server or Servlet Container

• Database Server

• OS upgrades and patches

Performing updates without interrupting users is essential for Zero Downtime deployments.

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What about DB Upgrades?

Will Continuous Deployment work?

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Hibernate

• hbm2ddl.auto = update

• Rarely we need to go in and update DB manually

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Zero-downtime DB Updates

012_rename_login_id_to_user_name

012_add_user_name_column 02_remove_login_id_column

expansion contraction

Src: Owen Rogers http://exortech.com/blog/

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Zero-downtime DB Updates

Src: Owen Rogers http://exortech.com/blog/

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• expansion

Zero-downtime DB Updates

Src: Owen Rogers http://exortech.com/blog/

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• expansion

• preserves backwards compatibility

Zero-downtime DB Updates

Src: Owen Rogers http://exortech.com/blog/

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• expansion

• preserves backwards compatibility

• contract

Zero-downtime DB Updates

Src: Owen Rogers http://exortech.com/blog/

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• expansion

• preserves backwards compatibility

• contract

• clean up

Zero-downtime DB Updates

Src: Owen Rogers http://exortech.com/blog/

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Industrial Logic’s eLearning CD Demo

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Eventually...

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CD’s Impact on Team Culture

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Encourage Evolutionary Design and Continuous Improvement culture

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Breaks work into micro-pieces, thereby enabling micro-deliveries

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Limited Work In Progress

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Knows when to hide or reveal work in progress

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Team takes shared ownership of the entire software development lifecycle

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The product is in a always-working-state

No developer is blocked because they can't get stable code 63

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Stop the Line Culture

Team catches issues at the source and avoid last minute integration and deployment nightmares

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Team crave for rapid feedback

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Complete Traceability

Version Control, Project & Requirements Managements tool, Bug Tracking and Build

system are completely integrated66

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Questions?Naresh Jain

@nashjainnaresh@agilefaqs.com

http://blogs.agilefaqs.com

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