Continuous Delivery for Agile Teams
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The document discusses the principles and practices of continuous delivery in an agile context. It emphasizes automating the entire software delivery process from code commits through deployment to production to minimize risks and ensure fast, reliable software updates. This includes having automated tests, continuous integration, monitoring systems, and the ability to rollback changes. It also stresses the importance of collaboration across teams to establish a shared goal of delivering value to customers through working software.
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Continuous Delivery for Agile Teams
- 1. CONTINUOUS DELIVERY (IN AN AGILE CONTEXT) Mike Bowler, Agile & Technical Coach Tweeting? Use @mike_bowler and #atmtl2013
- 2. Have a question?! Don’t wait, ask it!
- 3. WHAT IS CONTINUOUS DELIVERY AND WHY SHOULD I CARE?
- 4. AGILE PRINCIPLES SAY: “Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.”
- 5. AGILE PRINCIPLES SAY: “Deliver working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale.”
- 6. “Wait a minute! My company doesn’t want to deploy that often!” that ant is t port t’s im deliver fas Wha CAN you
- 8. , Tivoli, . Nagios w, etc PenVie O One master branch Production Monitoring and Alerts Rollbacks on error Deploy to production udson, Verify expected enkins / H J istrano, behaviour S, Cap e shell TF omemad, etc. H Compile and scripts Package Pull from master branch
- 9. WHAT COULD GO WRONG? We could put something new in production that doesn’t work or we could break something that used to work! We could put a half finished feature into production before it was ready and confuse the users! We could kick the users off the system in the middle of doing their work
- 10. HOW DID WE DEAL WITH THESE IN THE PAST? We had long manual test cycles between releases! We typically deployed off-hours when nobody was using the system e’re e if w utes easibl 15 min ot f very N ying e deplo
- 11. PRE-REQUISITES ARE HARD Able to deploy to production at the busiest time of the day with no visible changes - no unexpected changes, no downtime! Have sufficient monitoring to know when something goes wrong and the ability to rapidly fix it or roll back to a known good state! No manual processes after code has been checked in. Every step is automated.! Holistic view of the process, from customer request to production support. Team is bigger than just the devs.
- 12. DB migration hip ns ma fts ra Continuous integration One click deploy Configuration management One click rollback Provisioning Zero downtime deploy C Automation Courage Pride of work Common Goal Agile modeling Evolutionary design Design Cluster immune system Feature flags Comparative testing Simple design Whole Team Usability Measurements Stress testing Workin people g with o your de utside v team Alerts Engaged people Monitoring Sustainable pace Regular retrospectives Capacity Individuals Compliance ATDD Planning Continuous Delivery Scalability Executable specifications BDD TDD Rapid Feedback Frequent check-ins Single codebase Continuous improvement Version control Functional Configuration management Exploratory testing Performance Dependency management Cross-functional teams Incremental development Co-located teams Pair programming High communication Daily standups Refactoring Dev Team Coding standards Collective code ownership Shared understanding Informational workspace Simple architecture Small Stories hin it g w am kin te or ur W yo © 2013 Gargoyle Software Inc
- 14. COURAGE Courage to say no to requests that compromise the teams values! Courage to say code quality isn’t high enough! Courage to say these deadlines aren’t realistic! Courage to escalate issues that nobody wants to talk about
- 15. “Take pride in what you do. The kind of pride I'm talking about is not the arrogant puffed-up kind; it's just the whole idea of caring - fiercely caring.” Arnold Jacob "Red" Auerbach was an American basketball coach of the Washington Capitols, the Tri-Cities Blackhawks and the Boston Celtics. http://en.wikipedia.org/wiki/Red_Auerbach
- 16. EVOLUTIONARY DESIGN & INCREMENTAL DEVELOPMENT Design and build only what you need today! YAGNI : “You aren’t going to need it”
- 17. SIMPLE DESIGN “A complex system that works is invariably found to have evolved from a simple system that worked. The inverse proposition also appears to be true: A complex system designed from scratch never works and cannot be made to work. You have to start over, beginning with a working simple system.” -- Gall's Law
- 18. ENGAGED PEOPLE Continuous improvement (Sharpening the saw)! Sustainable Pace! Regular retrospectives
- 19. AUTOMATED TESTS ations ecific ble Sp ecuta Ex A section of executable code that can be run repeatedly to ensure that our production code does what it is supposed to do! Why is it important to automate these?
- 20. AUTOMATED TESTS ations ecific ble Sp ecuta Ex Techniques! ATDD (Acceptance Test Driven Development)! BDD (Behaviour Driven Development)! TDD (Test Driven Development)! All write specifications first. Why is this important?
- 21. EXPLORATORY TESTING Looking for issues! Done earlier in the process
- 22. PAIR PROGRAMMING
- 23. REFACTORING Code refactoring is a “disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behaviour”, undertaken in order to improve some of the nonfunctional attributes of the software. ! ! Advantages include improved code readability and reduced complexity to improve the maintainability of the source code, as well as a more expressive internal architecture or object model to improve extensibility.! ! -- Wikipedia entry on Refactoring
- 24. “The trouble with quick and dirty is that dirty remains long after quick has been forgotten.” Steven C. McConnell is an author of many software engineering textbooks including Code Complete, Rapid Development, and Software Estimation. http://en.wikipedia.org/wiki/Steve_McConnell
- 26. SMALL STORIES
- 27. SHARED UNDERSTANDING Agreed standards! Coding conventions! Shared design! Simple architecture
- 28. COLLECTIVE CODE OWNERSHIP We all own the code! We all keep it clean! Clean up the garbage, no matter who left it like that! Freedom to make any change, anywhere in the code base
- 31. CROSS FUNCTIONAL TEAMS Everyone should know a little of everything! Should everyone be able to take a vacation? Even the specialists?
- 32. CONFIGURATION MANAGEMENT Use version control! Check in everything that can’t be regenerated! Check in frequently
- 33. BRANCHING Avoid feature branches! Avoid anything that requires manual merging
- 34. This model assumes one ! branch. ! ! Avoid feature branches. Production Monitoring and Alerts Rollbacks on error Deploy to production Verify expected behaviour Compile and Package Pull from master branch
- 35. One branch ! per developer Production Monitoring and Alerts Deploy to production Verify expected behaviour Rollbacks on error Compile and package Merge with master branch Verify expected behaviour Verify expected behaviour Verify expected behaviour Compile and Package Compile and Package Compile and Package Merge with local copy of master Merge with local copy of master Merge with local copy of master Pull from Amy’s branch Pull from Bob’s branch Pull from Carol’s branch
- 37. RAPID FEEDBACK
- 38. PLANNING & MEASUREMENT Plan for production usage! Capacity planning! Compliance! Scalability! ! Stress testing! Comparative measurements
- 39. MONITORING & ALERTS Monitor all production usage and trigger alerts for abnormal conditions.! How do operations know what conditions are abnormal?
- 40. FEATURE FLAGS A/B testing! Hiding incomplete features! Enabling features based on permissions
- 41. COMMON GOAL How does each group get measured?! Developers! Testers! DBA’s! Operations staff! Are those measurements helping or hurting the overall goal?
- 42. AUTOMATION No more manual processes! Full automation of deploy and rollback, including database changes
- 43. MORE ADVANCED AUTOMATION Provisioning! Getting a new machine up and running ! Configuration management! Making changes to a machine already running! Cluster immune system! Automated rollbacks if the new deploy doesn’t meet defined acceptable thresholds
- 44. RECAP
- 45. Production Monitoring and Alerts Rollbacks on error Deploy to production Verify expected behaviour Compile and Package Pull from master branch
- 46. PRE-REQUISITES Able to deploy to production at the busiest time of the day with no visible changes - no unexpected changes, no downtime! Have sufficient monitoring to know when something goes wrong and the ability to rapidly fix it or roll back to a known good state! No manual processes after code has been checked in. Every step is automated.! Holistic view of the process, from customer request to production support. Team is bigger than just the devs.
- 47. DB migration hip ns ma fts ra Continuous integration One click deploy Configuration management One click rollback Provisioning Zero downtime deploy C Automation Courage Pride of work Common Goal Agile modeling Evolutionary design Design Cluster immune system Feature flags Comparative testing Simple design Whole Team Usability Measurements Stress testing Workin people g with o your de utside v team Alerts Engaged people Monitoring Sustainable pace Regular retrospectives Capacity Individuals Compliance ATDD Planning Continuous Delivery Scalability Executable specifications BDD TDD Rapid Feedback Frequent check-ins Single codebase Continuous improvement Version control Functional Configuration management Exploratory testing Performance Dependency management Cross-functional teams Incremental development Co-located teams Pair programming High communication Daily standups Refactoring Dev Team Coding standards Collective code ownership Shared understanding Informational workspace Simple architecture Small Stories hin it g w am kin te or ur W yo © 2013 Gargoyle Software Inc
- 48. “Design and programming are human activities; forget that and all is lost.” Bjarne Stroustrup is a Danish computer scientist, most notable for the creation and the development of the widely used C++ programming language. http://en.wikipedia.org/wiki/Bjarne_Stroustrup
- 49. MORE READING
- 50. CONTACTING ME Mike Bowler! Agile & Technical Coach ! ! mbowler@GargoyleSoftware.com! Cell: 905 409-7052! Twitter: @mike_bowler! ! Other links for me on Facebook, Google+ etc at! http://www.GargoyleSoftware.com/mike_bowler
- 51. HANDOUTS
- 52. DB migration hip ns ma fts ra Continuous integration One click deploy Configuration management One click rollback Provisioning Zero downtime deploy C Automation Courage Pride of work Common Goal Agile modeling Evolutionary design Design Cluster immune system Feature flags Comparative testing Simple design Whole Team Usability Measurements Stress testing Workin people g with o your de utside v team Alerts Engaged people Monitoring Sustainable pace Regular retrospectives Capacity Individuals Compliance ATDD Planning Continuous Delivery Scalability Executable specifications BDD TDD Rapid Feedback Frequent check-ins Single codebase Continuous improvement Version control Functional Configuration management Exploratory testing Performance Dependency management Cross-functional teams Incremental development Co-located teams Pair programming High communication Daily standups Refactoring Dev Team Coding standards Collective code ownership Shared understanding Informational workspace Simple architecture Small Stories Mike Bowler hin it Agile & Technical Coach © 2013 Gargoyle Software Inc g w am (905) 409-7052 kin te r r mbowler@GargoyleSoftware.com Woyou @mike_bowler
- 53. Production Monitoring and Alerts Rollbacks on error Deploy to production Verify expected behaviour Compile and Package Pull from master branch Mike Bowler Agile & Technical Coach (905) 409-7052 mbowler@GargoyleSoftware.com @mike_bowler