Modern operations with Apache Sling (2014 adaptTo version)
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The document discusses using Apache Sling for modern operations. It describes using Docker and Fig to set up a cluster of stateless and elastic Sling instances that can scale. While Sling works well with some modern operations approaches, dynamic service discovery and handling eventual consistency between instances need more work. The full potential of Sling for modern operations can be unlocked with further testing and development.
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Modern operations with Apache Sling (2014 adaptTo version)
- 1. APACHE SLING & FRIENDS TECH MEETUP BERLIN, 22-24 SEPTEMBER 2014 Bertrand Delacrétaz - Principal Scientist, Adobe - Apache Sling PMC member Modern Operations with Apache Sling @bdelacretaz - grep.codeconsult.ch - slides revision 2014-09-23
- 3. modern operations with Apache Sling - @bdelacretaz - September 2014
- 4. tinyurl.com/slingops modern operations with Apache Sling - @bdelacretaz - September 2014
- 5. modern operations with Apache Sling - @bdelacretaz - September 2014
- 6. modern operations with Apache Sling - @bdelacretaz - September 2014 1..N2Sling2instances
- 7. 7 How can Sling help?
- 8. Programmable Infrastructure Git>driven deployments Modern Operations Stateless services Elastic clusters Self>healing2 systems modern operations with Apache Sling - @bdelacretaz - September 2014 First>class2 logs http://12factor.net/ Immutable services ? Metrics Distributed workers Service discovery
- 9. modern operations with Apache Sling - @bdelacretaz - September 2014 We’re still exploring… picture: mxruben on morguefile.com
- 10. Let’s play with this stuff 10
- 11. Playground: https://github.com/bdelacretaz/docker>sling>cluster/ … Each2box2is2a2Docker2container2 Fig2defines2the2cluster2topology2 modern operations with Apache Sling - @bdelacretaz - September 2014 Etcd2used2for2discovery
- 12. 12 Git-driven Sling setup
- 13. Sling2Crankstart2Launcher:2 Generic Launcher Artifacts Repository Single2text2file2fully2defines2a2Sling2instance modern operations with Apache Sling - @bdelacretaz - September 2014
- 14. Crankstart/1 modern operations with Apache Sling - @bdelacretaz - September 2014
- 15. Crankstart/2 modern operations with Apache Sling - @bdelacretaz - September 2014
- 16. Crankstart/3 modern operations with Apache Sling - @bdelacretaz - September 2014
- 17. Generic Launcher Artifacts Repository Git>driven2Sling2setup! modern operations with Apache Sling - @bdelacretaz - September 2014
- 18. Programmable Infrastructure Git>driven deployments Immutable services Experimenting2with Modern Operations Stateless services Elastic clusters Self>healing2 systems modern operations with Apache Sling - @bdelacretaz - September 2014 First>class2 logs http://12factor.net/ Metrics Distributed workers Service discovery
- 19. 19 Docker and Fig
- 20. start.sh2(excerpts) Dockerfile Service2discovery2 via2Docker2links2 (env.2variables) Starting2Sling2in2a2Docker2image modern operations with Apache Sling - @bdelacretaz - September 2014
- 21. fig.yml2excerpts2 fig2up2to2start2 fig2scale2sling=42to2scale fig.yml2defines2the2cluster modern operations with Apache Sling - @bdelacretaz - September 2014
- 22. https://github.com/bdelacretaz/docker>sling>cluster/ … modern operations with Apache Sling - @bdelacretaz - September 2014 Services2launched2by2fig2 Static2discovery:2Docker2links2 Dynamic2discovery:2etcd
- 23. Programmable Infrastructure Git>driven deployments Immutable services Experimenting2with Modern Operations Stateless services Elastic clusters Self>healing2 systems modern operations with Apache Sling - @bdelacretaz - September 2014 First>class2 logs http://12factor.net/ Metrics Distributed workers Service discovery
- 24. 24 So, what’s missing?
- 25. modern operations with Apache Sling - @bdelacretaz - September 2014 Get2configs2from2 environment2 variables.2 Reconnect2without2 interruption2if2 backend2changes. Dynamic2service2discovery2needs2some2work
- 26. // Code from Sling’s NodeTypeBasedRenderingTest uploadTestScript(scriptPath, "nodetype-and-path.esp", “html.esp”); ! // next request might hit a different Sling instance which // does not see the changed content yet String content = getContent(testNodeUrl + ".html", CONTENT_TYPE_HTML); Eventual2consistency2impacts2applications modern operations with Apache Sling - @bdelacretaz - September 2014
- 27. While2moving2from2 C12to2C2,2the2same2 content2might2be2 exposed2to2two2 different2versions2 of2your2application. Old2app New2app Continuous2deployment2requires2interoperability modern operations with Apache Sling - @bdelacretaz - September 2014
- 28. Programmable Infrastructure Git>driven deployments Immutable services Experimenting2with Modern Operations Stateless services Elastic clusters Self>healing2 systems modern operations with Apache Sling - @bdelacretaz - September 2014 First>class2 logs http://12factor.net/ Metrics Distributed workers Service discovery Not2too2bad…the2devil2is2in2the2details!
- 29. 29 Conclusions
- 30. No2major2problems2with2Sling2in2 modern2operations.2 Runtime2assembly2might2help.2 Dynamic2backend2discovery2 needs2testing,2OSGi2helps.2 Programmable,2elastic,2dynamic2 deployments2become2the2norm.2 Applications2might2need2some2 work:2eventual2consistency,2 interoperability2of2versions. https://github.com/bdelacretaz/docker>sling>cluster/ tinyurl.com/slingops modern operations with Apache Sling - @bdelacretaz - September 2014