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Carton CPAN dependency manager
This document summarizes a presentation about managing CPAN dependencies for web development projects. It describes a case study where a developer installed many CPAN modules for a new web app, but ran into problems with dependency and versioning issues during deployment to production servers. The presenter then introduced their solution called Carton, a tool for creating isolated, local Perl environments for apps and locking dependency versions to allow reproducible, stable deployments across different machines. Key features discussed included dependency declaration, isolated environments, version control, analysis and more. The document concludes with a call for questions and thanks.
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Carton CPAN dependency manager
- 1. Carton Tatsuhiko Miyagawa YAPC::Asia 2011 Tokyo Friday, October 14, 2011
- 2. Managing CPAN Dependencies Friday, October 14, 2011
- 3. Case Study: (Poor) Web Development Friday, October 14, 2011
- 4. You’re writing anew web app. You don’t wanna reinvent wheels. Want to use as many CPAN deps. Friday, October 14, 2011
- 5. Fine. Get them from CPAN, install on your machine. Friday, October 14, 2011
- 6. > cpanm Web::Framework installed LWP-‐5.912 installed Plack-‐0.9980 installed Web-‐Framework-‐1.20 > cpanm JSON::Fast installed JSON-‐Fast-‐1.91 > cpanm MIME::Parser::XS installed MIME-‐Parser-‐XS-‐0.20 Friday, October 14, 2011
- 7. Test it... Friday, October14, 2011
- 8. Works? Ship it! Friday,October 14, 2011
- 9. Deployment Set up new production servers. Install CPAN modules (until the errors are gone) Friday, October 14, 2011
- 10. Few weeks later... Friday,October 14, 2011
- 11. Your website ispopular! Need more web servers! Friday, October 14, 2011
- 12. Re-Deployment Set up new production servers. Install CPAN modules (until the errors are gone) Friday, October 14, 2011
- 13. “Crap, Web::Framework hasbeen updated to 1.4 and many APIs have been changed or deprecated!” Friday, October 14, 2011
- 14. Rollback Log in to the old web server. Check Perl module versions. Install them on the new server. Friday, October 14, 2011
- 15. “Crap, this authordeleted the version 1.20 we want. Let’s go to BackPAN...” Friday, October 14, 2011
- 16. “Crap, version 1.20doesn’t actually work with the newer LWP 6 that we just installed! Have to downgrade this too...” Friday, October 14, 2011
- 17. and so on. Friday,October 14, 2011
- 18. What was wrong? Friday,October 14, 2011
- 19. • Dependency declaration • Isolated Perl environments • Version controls/history • Dependency analysis • Repeatable deployments • etc. Friday, October 14, 2011
- 20. Many existing solutions MyCPAN, DPAN, CPAN::Mini::Inject, OrePAN, Shipwright Friday, October 14, 2011
- 21. None of those didn’t quite work for me. (Or I haven’t even tried) Friday, October 14, 2011
- 22. So I wrotea new one. Friday, October 14, 2011
- 23. Carton https://github.com/miyagawa/carton Friday, October 14, 2011
- 24. Inspired by... Friday, October14, 2011
- 25.
- 26. • App-specific localenvironment • Fast and safe install • Dep-tree analysis, including versions • Locking module versions • Easy Redeployment • Single-file,VCS friendly • Safe and easy rollback Friday, October 14, 2011
- 27. Local perl environment Using local::lib and cpanm -L Each app has an isolated local library path Friday, October 14, 2011
- 28. Fast and safeinstall cpanm 1.5 Saves MYMETA.json and install meta info Friday, October 14, 2011
- 29. Dep tree analysis Rebuild the dependency tree from meta info Checks if anything is missing/superflous Friday, October 14, 2011
- 30. Locking versions Versions are saved in carton.lock including dependencies Friday, October 14, 2011
- 31. Easy Redeployment Reinstall exactly the same set of modules on another prod/development machines. Friday, October 14, 2011
- 32. Single-file,VCS friendly You can add carton.lock to git update whenever you update modules Friday, October 14, 2011
- 33. Safe and easyrollback revert the lock file and redeploy Friday, October 14, 2011
- 34.
- 35. > cpanm Carton Friday,October 14, 2011
- 36. WARNING It is beta software, some features are missing or not working correctly (yet). Friday, October 14, 2011
- 37. github.com/miyagawa/carton irc.perl.org #carton Friday, October 14, 2011
- 38.
- 39. Thanks! twitter.com/miyagawa Friday, October 14, 2011