continuous deployment demystified
DESCRIPTION
"Release Early, Release Often" is a proven mantra, but what happens when you push this practice to it's limits? .i.e. deploying latest code changes to the production servers every time a developer checks-in code. At Industrial Logic, developers are deploying code dozens of times a day, rapidly responding to their customers and reducing their "code inventory". In this talk I explained the approach, deployment architecture, tools and culture needed for CD and how at Industrial Logic, we have gradually got there. You can walk away with some good ideas of how your company can practice CD too.TRANSCRIPT
Licensed Under Creative Commons by Naresh Jain
Continuous DeploymentEmbrace Continuous Improvement
Naresh Jain@nashjain
[email protected]://blogs.agilefaqs.com
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Licensed Under Creative Commons by Naresh Jain
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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
Licensed Under Creative Commons by Naresh Jain
Plan
Design
Hap
pine
ss/E
xcite
men
t
Time/Money/Opportunity Cost17
Licensed Under Creative Commons by Naresh Jain
Plan
Design
Distribute
Hap
pine
ss/E
xcite
men
t
Time/Money/Opportunity Cost17
Licensed Under Creative Commons by Naresh Jain
Plan
Design
Distribute
Work in IsolationH
appi
ness
/Exc
item
ent
Time/Money/Opportunity Cost17
Licensed Under Creative Commons by Naresh Jain
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
http://blogs.agilefaqs.com
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