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


It’s about the flow of value through your company


IT is bursty


Factories are Bursty


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


Code is Value


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


Flow

Business Customer

Dev Ops


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


Developing Systems Thinking

The Three WaysTheory of Constraints


The First Way (Automate)Systems Thinking / Flow

Business Customer

Dev Ops


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


Something’s Missing Here!


The Second Way (Collaborate)Amplify Feedback Loops

Business Customer

Dev Ops


The Second Way (Collaborate)

• Cross-team info sharing

• Customer feedback

• Fix bugs faster, fewer regressions

• Decrease delivery time

• Decrease unplanned work


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

Business Customer

Dev Ops


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


How do I improve?

Look to decrease cycle timesReduce the amount changed per

cycle


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


THAT SOUNDS SO EASY!Where do we look?


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.


Traditional Release Process

Monolithicplan

MVPcode

QA/Test Delivery

Budgeted time Delays


Deployment PipelineShamelessly stolen from Jez Humble



• 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



• 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


Building a Pipeline

Don’t Get Into Tooling Food Fights


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


Why I Want CD (if I’m the Business)

• Innovate Faster

• Respond to Market Demands

• Fix Screw-Ups

• Lean/Agile


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


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


Fear Is the Mind Killer

You can still release as slowly as you want.

You just have the option to go faster


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


Thank YouEric ShamowMethodologies Lead | Puppet Labs @eshamow


Just What Is This Continuous Delivery Thing, Anyway?

Technology

Transcript of Just What Is This Continuous Delivery Thing, Anyway?