T3DD12 Caching with Varnish

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  • 1. Make yourwebsite flyusing Varnish Fabrizio Branca T3DD12
  • 2. Fabrizio BrancaSystem DeveloperAOE mediaWiesbadenTYPO3 & MagentoTwitter: @fbrncBlog: http://www.fabrizio-branca.de
  • 3. You?!• Who has any experience with Varnish?• Who has a production site using Varnish?• Who has played around with Varnish?• Who has experience with any other reverse proxy solution?
  • 4. 1m visitors in 24h 5000 concurrent users
  • 5. Secret ingredient:Varnishhttp://www.flickr.com/photos/judybaxter/8155091/
  • 6. Reverse proxy caching RequestBrowser TYPO3 (Apache + PHP + Mysql) Response
  • 7. Reverse proxy cachingBrowser Varnish TYPO3 (Apache + PHP + Mysql)
  • 8. Reverse proxy cachingBrowser Nginx Varnish TYPO3 (Apache + PHP + Mysql) - SSL termination - (Compression)
  • 9. Reverse proxy cachingBrowser Nginx Varnish TYPO3 (Apache + PHP + Mysql)
  • 10. Varnish HTTP Caching Load FailoverAccelerator Reverse Proxy Balancer system „Varnish makes websites fly“
  • 11. Varnish• Created by Poul-Henning Kamp• Varnish Configuration Language (VCL) – DSL, will be translated into C code and compiled• Varnish uses thread and memory management of the operation system• Additional tools: varnishtop, varnishlog,…• Online-Documentation: http://www.varnish-cache.org/docs/2.1/
  • 12. Stability
  • 13. Efficiency
  • 14. CPU load
  • 15. Speed
  • 16. Installation• In Ubuntu:sudo apt-get install varnishsudo vi /etc/default/varnishSTART=yessudo /etc/init.d varnish start• Will be started automatically on boot• Listens to port 6081 by default• Uses 127.0.0.1:8080 as a backend by default• /etc/varnish/default.vcl
  • 17. Setup Amazon ELB Load F5 Balancer Varnish Varnish Varnish TYPO3 frontends TYPO3 backend
  • 18. Nginx, Varnish, Apache setup
  • 19. Request Lifecycle (simplified) Complete workflow: http://www.varnish-cache.org/trac/wiki/VCLExampleDefault
  • 20. Pitfalls• Vary: User-Agent (also implicitly set e.g. SetEnvIf)
  • 21. Tools: Varnishhist
  • 22. Restart / Reload• Restart: Flushes complete cache• Reload: Reads VCL without flushing cache
  • 23. 855,78 Pages/SecondBenchmarks 3,45 10,72 Pages/Second Pages/Second TYPO3 TYPO3 TYPO3 without cache with cache with Varnish
  • 24. Sending correct headers• config.sendCacheHeaders = 1• The conditions for allowing client caching are: – page was cached – No *_INT or *_EXT objects were on the page (eg. USER_INT) – No frontend user is logged in – No backend user is logged in• If these conditions are met, the headers sent are: – Last-Modified [SYS_LASTCHANGED of page id] – Expires [expire time of page cache] – Etag [md5 of content] – Cache-Control: max-age: [seconds til expiretime] – Pragma: public
  • 25. EXT:cacheinfo• http://forge.typo3.org/projects/show/extens ion-cacheinfo
  • 26. Purging• http://forge.typo3.org/projects/show/extens ion-purge• Configuration in VCL• Access protect• Purge using Shift+Reload
  • 27. Punching Holes… http://www.flickr.com/photos/stevendepolo/3053981107/lightbox/
  • 28. Punching holes Cookie / ESI AJAX Client storage
  • 29. Tuning• Different lifetimes for clients and Varnish• Cache status codes > 400• Redirects• Protect the backend!
  • 30. Further reading• Varnish (inkl. Dokumentation) http://www.varnish-cache.org• Poul-Henning Kamp at T3CON10 http://vimeo.com/16676188• http://forge.typo3.org/projects/show/extension- moc_varnish• http://www.fabrizio-branca.de/varnish.html• http://www.fabrizio-branca.de• https://github.com/fbrnc
  • 31. Questions?Mail: fabrizio.branca@aoemedia.deTwitter: @fbrncBlog: http://www.fabrizio-branca.de