Continuous Delivery

CONTINUOUS DELIVERY Mikalai Alimenkou http://xpinjection.com 17.12.2011

Background• Java Technical Lead/Scrum Master at Zoral Labs• 7+ years in software development• 5+ years of working by Agile methodologies• Expert in Agile engineering practices• Founder and coach at XP Injection (http://xpinjection.com)• Organizer of Selenium Camp, JEEConf and XP Days Ukraine conferences

Every tool or practice should solve particular problemsWHY CONTINUOUS DELIVERY?

What changed in business? It is faster now!• Что изменилось в бизнесе? Он стал быстрее.

How long?

Still afraid of releases?

Your typical release

Kanban promotes continuous flow

XP style – ifit hurts, do it more often

“How long would it take your organization todeploy a change that involves just one single lineof code?Do you do this on a repeatable reliable basis?” - Mary and Tom Poppendieck

Continuous Delivery Keeping systems production- ready throughout development, so that they canbe released to users at any time

”Continuous delivery is about putting the releaseschedule in the hands of the business, not in the handsof IT.Implementing continuous delivery means making sureyour software is always production ready throughoutits entire lifecycle – that any build could potentially bereleased to users at the touch of a button using a fullyautomated process in a matter of seconds or minutes.” - Jez Humble

Nobody tell you it is easy, but many people practice itREQUIRED STEPS FOR SUCCESS

1. Select version Release should2. Select environment be simple3. Push the button

WTF?!? What about QA?Risk Management? Team Policies?

Automateeverything! Upgrade TestsBuild Deployment

Stable releasable trunk

How is it possible? Small features Slicing development Don’t show UI Feature flags

Global Continuous Integration

TDD at all levels ATDD TDDCustomer’s Tests Programmers’ Tests Acceptance Fixtures Production Unit Integration Tests Code Tests Tests

Detailed static code analysis

1. Plan 2. Prepare 3. TestAlways thinkabout rollback

Deployment Load balancer sample XApp Server X DB Server

Deployment Load balancer sample X X 1. Start new App Server 2. Use slave DBApp Server App Server X X DB Server DB Server

Deployment Load balancer sample X X 1. Start new App Server 2. Use slave DB 3. Deploy in read only modeApp Server App Server 4. Switch load balancer X X DB Server DB Server

Deployment Load balancer sample Y X 1. Start new App Server 2. Use slave DB 3. Deploy in read only modeApp Server App Server 4. Switch load balancer 5. Update master DB 6. Deploy new code Y X DB Server DB Server

Deployment Load balancer sample Y X 1. Start new App Server 2. Use slave DB 3. Deploy in read only modeApp Server App Server 4. Switch load balancer 5. Update master DB 6. Deploy new code 7. Switch load balancer Y X DB Server DB Server

Deployment Load balancer sample Y 1. Start new App Server 2. Use slave DB 3. Deploy in read only modeApp Server 4. Switch load balancer 5. Update master DB 6. Deploy new code 7. Switch load balancer Y Y 8. Release old App Server 9. Synchronize slave DB DB Server DB Server

Don’t forget about…Monitoring Smoke testing5 whys technique Retrospective

How to start?Start with walking skeleton Automate step by stepReduce deploy batch size Reduce deployment cycle

Visualize path of your code from developers to end usersBUILD PIPELINES

Performance Dev Testing Testing Staging Demo UATProduction Different environments on code path

Build Pipeline sample

Build pipeline sequence

Jenkins BuildPipeline Plugin

TeamCityBuild Chain

Cruise Pipelines

Do nothing before benefits are not clear for youCONTINUOUS DELIVERY BENEFITS

Reduce errors in manual repeatable tasks

Fail early with deployment

Small changes reduce risks

Short feedback cycle

Everybody can deploy to production

Before After Dev Commit Monitor TestRelease QA Deploy • 2 week release cycles • code freeze • multiple releases a day • big events • non-events • large code changes • small number of changes

Books to read

@xpinjection http://xpinjection.commikalai.alimenkou@xpinjection.com

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Continuous Delivery

by Mikalai Alimenkou on Dec 21, 2011

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Continuous Delivery — Webinar Transcript