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Continuous Delivery Mike McGarr mike.mcgarr@excella.com http://earlyandoften.wordpress.com  @jmichaelmcgarr
About Me ,[object Object]
Excella Consulting, Arlington VA
Lead of Excella’s Java Center of Excellence
Java Developer for over 11 years
Interests:
Developer Productivity
XP & Agile
Automation
Testing
Polyglot Programming2
Agenda Story What is Continuous Delivery? Core Practices Tools 3
Typical Project 4 Analyst & Customer Requirements Architect Design Developer Development Tester QA Operations Release
5 Waterfall http://flic.kr/p/6fREaa
6 Problems with Waterfall Long QA feedback loop Lack of collaboration Inability to change direction
WaterFall Project 7 Analyst & Customer Requirements Architect Design Developer Development Tester QA Operations Months! Release
8 Agile http://flic.kr/p/PQFQg
Agile Project 9 Customer  & Team Customer  & Team Customer  & Team Requirements Requirements Requirements Test Test Test Development Development Development Operations Release Days! The Last  Mile? Months!
10 The Last Mile Manual Deployments Insufficient Configuration Management Infrequent, Error Prone Deployments
11 Stressful Releases
Agenda Story What is Continuous Delivery? Core Practices Tools 12
13 What is Continuous Delivery?
14
15
…a set of practices and principles aimed at, building, testing, and releasing software faster and more frequently. 16 Continuous Delivery is…
“Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.” - First of the Twelve Principles behind the Agile Manifesto 17
Goals Cycle Time Quality 18
“How long would it take your organization to deploy a change [to production] that involves just one single line of code?  Do you do this on a repeatable, reliable basis?” ,[object Object],Implementing Lean Software Development 19 Cycle Time
http://flic.kr/p/y8KV8 20 Done means Released
21 Frequent Automated Deployments http://flic.kr/p/29Ree
22 Continuous what? Continuous Delivery Continuous Deployment Continuous Integration
Agenda Story What is Continuous Delivery? Core Practices Tools 23
24 Core Practices
25 Continuous Deployment Build Pipelines Deployment Automation Configuration Management Continuous Integration Testing Agile
26 Configuration Management Version Everything! Single Identifier	 Dependencies App Configurations Data Environments
27 Continuous  Integration http://flic.kr/p/5GpzSM
28 Continuous Integration Check-in Daily Commit to Trunk  Automate the Build Keep the Build Fast Every Commit results in Build Test in Clone of Production Automate Deployment
29 Recommended Practices Extreme Programming (XP) Fail a Build for Design Breaches Fail a Build for Slow Tests Fail a Build for Warnings & Code Style Breaches
30 Testing
31 Kinds of Tests Unit Tests Integration Tests Functional/Acceptance Tests Performance & Load Tests Penetration Tests Exploratory Tests
32 Testing Strategy Identify and Prioritize Project Risk Decide what Actions to Take Tests = Executable Specifications Confidence
33
34 Testing Recommendations Automate your Tests Use Fakes/Mocks Automated Acceptance Testing
35 Automated Acceptance Tests Fast Feedback Reduce Tester workload Testers can do Exploratory Testing Regression Tests Requirements can be generated from Tests
Acceptance Test Approaches Acceptance Test Driven Development (ATDD) Behavior Driven Development (BDD) Given [some precondition] When [some event] Then [some result] 36
http://flic.kr/p/6VmGxK 37 Deployment Automation
38 Deployment Automation Artifact Repository Application Configurations Middleware Version Control Operating System Database
39 Use Appropriate Technology http://flic.kr/p/6pmtQL
Scripting Approaches Script logs into each box and runs deployment script commands Script runs locally, each remote machine has agent execute script Package app using platform’s packaging technology, and use infrastructure management tools push new versions 40
Database Deployments Version your Database Evolve Your Database Incrementally 41
Environment Management Version your Application Configuration Version your Operating System 42
43 Deploying to the Cloud http://flic.kr/p/4R35Dd
44 Build Pipelines http://www.fotopedia.com/users/chmehl
Build Pipelines A Build Pipeline is an automated manifestation of your process for getting software from version control into the hands of your users. 45
Synonyms Build Pipeline Deployment Pipeline Continuous Integration Pipeline Deployment Production Line Living Build 46
BuildPipelines A Chain of Jobs  Early Jobs run Fast Every Check-in creates a new Pipeline When a Job Fails, the Pipeline fails Keep Code Production Ready 47
48 Stages of a Pipeline
49 Pipeline Practices Build Once, Deploy Many Deploy the Same Way to All Environments Smoke Test you Deployments Deploy into a Copy of Production Each Change should Propagate Instantly If any part fails, Stop the line
50 Pull System
51 Continuous Deployment
Agenda Story What is Continuous Delivery? Core Practices Tools 52
53 Tools http://flic.kr/p/5cK2
Version Control 54

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Continuous Delivery

Editor's Notes

  1. Requirements/Design/Development Feedback Loop is months.So much can change in that timeFeedback Loop for Release is just as long.
  2. Continuous delivery is a……set of practices and principles aimed at building, testing and releasing software faster and more frequently.
  3. Collaboration (DEV + Customer, DEV + Operations)Talking early and often…break down walls. [DevOps]Automation. Automate Everything! Build, Test, Deploy!Frequency. Frequent means small. Easier to troubleshoot, rollback. Reduces Risk.Feedback. Change triggers feedback. Feedback is fast. Team acts on it.
  4. Agile fixes the feedback loop problem for Requirements/Design/Development.Release Feedback is still months.
  5. Collaboration (DEV + Customer, DEV + Operations)Talking early and often…break down walls. [DevOps]Automation. Automate Everything! Build, Test, Deploy!Frequency. Frequent means small. Easier to troubleshoot, rollback. Reduces Risk.Feedback. Change triggers feedback. Feedback is fast. Team acts on it.
  6. The Last Mile tends to be an obstacle to achieving thisTransition – why are automated deployment so important? Because a feature doesn’t add value until it is in production.
  7. Does anybody know what this is a picture of?