Just What Is This Continuous Delivery Thing, Anyway?

Just What Is This Continuous Delivery Thing, Anyway?Eric ShamowMethodologies Lead | Puppet Labs @eshamow

Monday, November 4, 13

DevOps is about facilitating the business through IT

Monday, November 4, 13

It’s about the flow of value through your company

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IT is bursty

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Factories are Bursty

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Factories are Bursty...but they’ve solved a lot of this

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Code is Value

Monday, November 4, 13

Code is Value

“How long would it take your organization to deploy a change that involves just one single line of code? Do you do this on a repeatable, reliable basis?”

- Mary and Tom Poppendieck, Implementing Lean Software Development

Monday, November 4, 13

Flow

Business Customer

Dev Ops

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How do we speed up flow?Laying a foundation - Gene Kim’s Three Ways

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Developing Systems Thinking

The Three WaysTheory of Constraints

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The First Way (Automate)Systems Thinking / Flow

Business Customer

Dev Ops

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The First Way (Automate)

• Never pass a defect downstream

• Never allow local optimization to create global degradation

• Always look to increase flow

• Always seek understanding of the system

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Something’s Missing Here!

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The Second Way (Collaborate)Amplify Feedback Loops

Business Customer

Dev Ops

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The Second Way (Collaborate)

• Cross-team info sharing

• Customer feedback

• Fix bugs faster, fewer regressions

• Decrease delivery time

• Decrease unplanned work

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The Third Way (Ship)Culture - Continual Experimentation and Learning

Business Customer

Dev Ops

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The Third Way (Ship)

• Continual experimentation

• Acceptance of risk and learning from failure

• Do difficult things more often

• Deliberately inject faults

• Test business hypotheses in real time

• Add system stress to decrease cycle time

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How do I improve?

Look to decrease cycle timesReduce the amount changed per

cycle

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Don’t Optimize for Maximum Utilization

• We don’t expect our systems to operate successfully at 100% capacity

• We expect activity to burst

• If people are scheduled for 100% utilization they aren’t free for bursty activity

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THAT SOUNDS SO EASY!Where do we look?

Monday, November 4, 13

This is What Success Looks Like

• You haven’t read it yet

• You still haven’t read it

• Why are you still here?

• GO. READ IT NOW.

Monday, November 4, 13

Traditional Release Process

Monolithicplan

MVPcode

QA/Test Delivery

Budgeted time Delays

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Deployment PipelineShamelessly stolen from Jez Humble

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This is What Success Looks Like

• Each step in this pipeline gets deployed using the CM tools and techniques

• Each landscape is as close to prod as you can get

• Each deployment looks like a production deployment

• Each deployment tests the rollout again

• By the time you release to prod, this build has been deployed A LOT

Monday, November 4, 13

This is What Success Looks Like

• Frequent, automated releases

• Every check-in is a potential release

• Every change triggers feedback

• Feedback must be received as soon as possible

• Automate almost everything

• Build quality in

- Chris Hilton, Beyond Continuous Delivery

Monday, November 4, 13

Building a Pipeline

Don’t Get Into Tooling Food Fights

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How Do We Get Buy-In?Target internal customer needs

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Why I Want CD (if I’m the Business)

• Innovate Faster

• Respond to Market Demands

• Fix Screw-Ups

• Lean/Agile

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Why I Want CD? (If I’m Dev)

• I can’t test against prod unless my environment looks like prod

• Finding out root cause is really hard

• Merge windows are really hard

• I need QA/Test feedback quickly

Monday, November 4, 13

Why I Want CD? (If I’m Ops)

• Ensure I get real handoff from Dev

• Infrastructure changes tested along with apps

• Small changes that don’t blow up prod on deploy day

• Ensure changes are thoroughly tested before deploy

• Self-service

Monday, November 4, 13

Fear Is the Mind Killer

You can still release as slowly as you want.

You just have the option to go faster

Monday, November 4, 13

It’s a Culture Shift

• Tool choice is not as important as tool sharing

• People and culture can work around bad tools

• Everybody owns the pipeline

• If the build is broken, it’s everybody’s problem

• We’re on the same team

Monday, November 4, 13

Thank YouEric ShamowMethodologies Lead | Puppet Labs @eshamow

Monday, November 4, 13