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![Failure
“Everything fails all the time [in the cloud]”
Werner Vogels, CTO, Amazon.com
• 21st Century Application Architecture
– www.skillsmatter.com (bit.ly/10jAdSV)
14/03/2014 @taidevcouk](https://image.slidesharecdn.com/devopsbryantv2014v2-140314040336-phpapp01/85/LJC-Chuck-Norris-Doesn-t-Do-DevOps-but-Java-developers-might-benefit-37-320.jpg)
Uploaded byDaniel Bryant
LJC: "Chuck Norris Doesn't Do DevOps...but Java developers might benefit"
The document discusses the concept of DevOps, emphasizing its role in enhancing communication and collaboration between software developers and IT operations. It highlights the importance of cultural change, continuous integration, and automation in software development while using humorous references to Chuck Norris to illustrate the challenges faced by teams. The key takeaways include the need for organized team structures, effective QA automation, and designing for failure in cloud environments.
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LJC: "Chuck Norris Doesn't Do DevOps...but Java developers might benefit"
- 1. Chuck Norris Doesn’tNeed DevOps… but Java Developers might benefit Daniel Bryant CTO, Instant Access Technologies d.bryant@iatltd.com @taidevcouk
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- 3. epoints.com 2012/13 Upgrade… @taidevcouk14/03/2014 •Increasing traffic – Scalability being stretched • Increasingly diverse requirements • Our starting point – Developers creating monolithic application – Manual QA – Operations deploying to data center
- 4. Core Changes… • Service-OrientedArchitecture • Cloud-based deployments • DevOps Culture @taidevcouk14/03/2014
- 5. Core Changes… • Service-OrientedArchitecture – Twitter’s Story (bit.ly/1j1WbmI) • Cloud-based deployments – “Cloud DHARMA”, 7th May at Skillsmatter • DevOps Culture – Today! @taidevcouk14/03/2014
- 6. What is DevOps? •“…a software development method that stresses communication, collaboration and integration between developers and IT professionals.” • “…aims to help an organization rapidly produce software products and services” http://en.wikipedia.org/wiki/DevOps 14/03/2014 @taidevcouk
- 7. What’s in aName? • “Development / Operations” • Increasing cohesion between: – Business – Development – Quality Assurance – Operations “Bu-Dev-Qa-Ops”? 14/03/2014 @taidevcouk
- 8. yeah…‘DevOps’ sounds waycooler… 14/03/2014 @taidevcouk
- 9. Two Sides ofthe Same ‘DevOps’ Coin… • Business-driven – ‘Creating organizational alignment’ – Value stream mapping – Waste analysis • Pragmatic Tech – Pushing Agile/XP into QA and Ops – Cross-functional empowerment – Tooling 14/03/2014 @taidevcouk
- 10. So, What’s ChuckNorris Doing Here? 14/03/2014 @taidevcouk
- 11. Chuck Norris doesn’tneed DevOps… …as a one-man army he codes with one hand, tests with the other and deploys with his beard 14/03/2014 @taidevcouk The rest of us… …work in teams to develop software
- 12. Software Development Teams •Developers • Quality Assurance • Operations @taidevcouk14/03/2014
- 13. Software Development Teams •Developers • Quality Assurance • Operations @taidevcouk14/03/2014
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- 15. Software Development Teams •Developers • Quality Assurance • Operations @taidevcouk14/03/2014
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- 17. Software Development Teams •Developers • Quality Assurance • Operations @taidevcouk14/03/2014
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- 19. This silo mentalityhas to stop 14/03/2014 @taidevcouk
- 20. Culture is Vital •Culture drives behaviour, drives culture… – “Communication, simplicity, feedback, courage” – Everyone is responsible for delivery – Continuous experimentation and learning • Not easy to change culture – The hardest part of DevOps… – …but you will learn new things 14/03/2014 @taidevcouk
- 21. Changing Culture • Greenfield –Flickr’s story (slidesha.re/sHpYV) – “Why other people don’t get it” • Sandro Mancuso (slidesha.re/1bcStpe) • Enterprise – “The Pheonix Project” • Gene Kim et al 14/03/2014 @taidevcouk
- 22. Changing Culture • Createan effective team… • “Habits of highly effective technical teams” – Martijn Verburg (bit.ly/1aF9SnK) • “Patterns of Effective Teams” – Dan North (vimeo.com/68226771) 14/03/2014 @taidevcouk
- 23. Chuck Norris doesn’tdo iterative development… …all applications Chuck Norris creates are right first time, every time 14/03/2014 @taidevcouk The rest of us… …need to enable agility (for both the business and technical teams)
- 24. We all doContinuous Integration, right? • Continuous Deployment/Delivery – Jez Humble and Dave Farley – Great InfoQ Video (bit.ly/XugWi8) • Create a “build pipeline” – Goal is fast feedback • Continuous Deployment – Production? 14/03/2014 @taidevcouk
- 25. Our Build Pipeline Jenkins,with plugins… • Build Pipeline – wiki.jenkins-ci.org/display/JENKINS/Build+Pipeline+Plugin • Parameterized build – wiki.jenkins-ci.org/display/JENKINS/Parameterized+Build • Promoted Builds Plugin – wiki.jenkins-ci.org/display/JENKINS/Promoted+Builds+Plugin • Chuck Norris plugin… – wiki.jenkins-ci.org/display/JENKINS/ChuckNorris+Plugin 14/03/2014 @taidevcouk
- 26. Our Build Pipeline •Component Build – Compile – Unit Tests (surefire) – Integration Tests (failsafe) • Deployment onto QA Cloud – Python Scripts + Chef to provision – Verify success using Python 14/03/2014 @taidevcouk
- 27. Our Build Pipeline •Acceptance Tests – Cucumber and Selenium – Work in progress… • Performance Tests – Jmeter – Jenkins Jmeter performance plugin • Staging / Live Deployment – Human-based conditional operation 14/03/2014 @taidevcouk
- 28. Gotchas • Managing dependenciesin SOA is hard, very hard • Branching – Gitflow, Branch Per Feature, or Mainline • Migrating data can be challenging – Liquibase / Flyway – MongoDB / Solr Schema versions in data – Wooga case study (bit.ly/1egArDC) – Shout out to Daniel Josefsson @ Shazam for tips! 14/03/2014 @taidevcouk
- 29. Chuck Norris doesn’tdo QA… …Chuck Norris can test an entire application with a single assert (and get 110% code coverage) 14/03/2014 @taidevcouk The rest of us… …need high-quality automated QA
- 30. Automating QA • Unittesting is essential • Intra-component integration testing – Spock is awesome (code.google.com/p/spock) – Utilise embedded datastore/middleware • Inter-component integration testing – The hardest part of SOA… 14/03/2014 @taidevcouk
- 31. Automating QA • Consumer-basedTesting – Brandon Byars (bit.ly/1lmcoaD) • Performance – JMeter + plugins (jmeter-plugins.org) – BlazeMeter • Website – Selenium (www.seleniumhq.org) – Geb (www.gebish.org) 14/03/2014 @taidevcouk
- 32. Automating QA • Makeit easy for everyone to execute • Include within the build pipeline • Make people care – fail the build! • “Agile Testing” by Lisa Crispin, Janet Gregory 14/03/2014 @taidevcouk
- 33. Chuck Norris doesn’tneed an OS… …his keyboard has two keys, 0 and 1 14/03/2014 @taidevcouk The rest of us… …need to provision bare metal, and also be comfortable with the OS
- 34. Say No ToSnowflakes! • Infrastructure as Code – Version control everything • Automate all provisioning – Chef, Puppet, SaltStack, Python, AWS CLI • Play with Vagrant (www.vagrantup.com) – “providers” are super cool 14/03/2014 @taidevcouk
- 35. Thinking/Acting Like ASysadmin • Learn Linux fundamentals • Diagnostic skills – top, iotop, iostat, netstat, vmstat – Java utils: jps, jstat, jmap, jhat – “DevOps Troubleshooting” by K. Rankin • Maybe grow a beard… 14/03/2014 @taidevcouk
- 36. Chuck Norris doesn’tfail… …he just finds a new way in which reality is broken 14/03/2014 @taidevcouk The rest of us… …should plan for failure
- 37. Failure “Everything fails allthe time [in the cloud]” Werner Vogels, CTO, Amazon.com • 21st Century Application Architecture – www.skillsmatter.com (bit.ly/10jAdSV) 14/03/2014 @taidevcouk
- 38. Black Swan Theory “…isa metaphor that describes an event that comes as a surprise, has a major effect, and is often inappropriately rationalized after the fact with the benefit of hindsight” Nassim Nicholas Taleb, The Black Swan http://amzn.to/1gaIqxz 14/03/2014 @taidevcouk
- 39. Failure Pre-Cloud we designedfor success… and handled failure. With Cloud we design for failure… and handle success. Credit to John Bassil for inspiration here! (@johnbassil) 14/03/2014 @taidevcouk
- 40. Design for Failure •Design patterns – Asynchronous communication – Timeouts / retries – Bulkheads / circuit-breakers • Inspiration – Chris Richardson (slidesha.re/1ft3vsg) – Netflix (bit.ly/1h5GMid) 14/03/2014 @taidevcouk
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- 42. Antifragile • The oppositeof fragile? – Robust… – Antifragile… • Netflix are best-in-class – bit.ly/1gs5n3q • System must be robust first! 14/03/2014 @taidevcouk
- 43. All arrays ChuckNorris creates are of infinite size… …as Chuck Norris knows no bounds 14/03/2014 @taidevcouk The rest of us… …should manage our resources and cultivate ‘mechanical sympathy’
- 44. Mechanical Sympathy • Beaware of deployment platform properties • …especially if in the cloud – Block Storage IOPS (100 vs 49k) – 1Gbps Network ( < 125MB/s vs > 400MB/s) – “Noisy neighbours” • Monitor everything (more on this later) 14/03/2014 @taidevcouk
- 45. When Chuck Norristhrows Exceptions… …everybody knows about it because they land outside of the data center 14/03/2014 @taidevcouk The rest of us… …should log all errors (and other vital information for diagnostic purposes)
- 46. Logging • Log prettymuch everything – Use appropriate levels • Make comments searchable/machine readable – Good tips (bit.ly/hweqm4) • Use centralised logging – Especially if in the cloud – Logstash, Loggly, Papertrail 14/03/2014 @taidevcouk
- 47. Chuck Norris doesn’tworry about application downtime… …Chuck Norris’ production servers are so scared they constantly ping him 14/03/2014 @taidevcouk The rest of us… …should monitor everything
- 48. Monitor All TheThings! • Infrastructure monitoring – Nagios – Zabbix – Splunk – AppDynamics 14/03/2014 @taidevcouk
- 49. Metrics 14/03/2014 @taidevcouk • Dropwizard’sMetrics – metrics.codahale.com • Netflix’s Servo – github.com/Netflix/servo • Etsy’s StatsD – github.com/etsy/statsd/wiki
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- 51. Gauges, Counters, Meters,Timers… 14/03/2014 @taidevcouk
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- 54. Inspirational Metrics Companies •Several trail-blazers – Etsy (www.codeascraft.com) – Netflix (techblog.netflix.com) 14/03/2014 @taidevcouk
- 55. In Summary… • DevOpsis driving Agile/XP into QA and Ops • Faster, leaner and more effective software – The ability to rapidly experiment is awesome! • There are some real benefits behind the buzz • Now is the time to step-up as a developer 14/03/2014 @taidevcouk
- 56. The Developer’s DevOpsAction Plan • Think about your company culture • Explore continuous delivery • Learn Linux basics • Automate provisioning • Design for failure • Cultivate mechanical sympathy • Improve logging/metrics 14/03/2014 @taidevcouk
- 57. Thanks For Listening •Massive thanks to all the IAT team – DevOps gurus, Jamie Clarkson and Anjani Phuyal • Questions / comments? – d.bryant@iatltd.com – @taidevcouk • Devoxx UK 12-13th June – www.devoxx.co.uk 14/03/2014 @taidevcouk
Editor's Notes
- #21 organizations which design systems ... are constrained to produce designs which are copies of the communication structures of these organizationsFocus on flow: translate business ideas to a working service efficiently by examining how fast artifacts and work flows through the development lifecycleAmplify feedback loops: quickly learn about the system by seeing through fast feedback on what happens to results of changes
- #31 James Gough’s “The benefits are more than just the tests”Mash Badar’s “TDD at Scale” (slidesha.re/19P7kzS)
- #45 Jackie Stewart, 3 times F1 world champion, coined the phrase “Mechanical Sympathy” as a term for the driver and the machine working together in harmony. This can be summarised in that a driver does not need to know how to build an engine but they need to know the fundamentals of how one works to get the best out of it.