T3DD12 Caching with Varnish

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Apr 16, 2012

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T3DD12 Caching with Varnish

  1. 1. Make yourwebsite flyusing VarnishFabrizio BrancaT3DD12
  2. 2. System DeveloperAOE mediaWiesbadenTYPO3 & MagentoTwitter: @fbrncBlog: http://www.fabrizio-branca.deFabrizio Branca
  3. 3. • Who has any experience with Varnish?• Who has a production site using Varnish?• Who has played around with Varnish?• Who has experience with any otherreverse proxy solution?You?!
  4. 4. 1m visitors in 24h5000 concurrent users
  5. 5. Secret ingredient:Varnishhttp://www.flickr.com/photos/judybaxter/8155091/
  6. 6. Reverse proxy cachingBrowser TYPO3(Apache + PHP + Mysql)RequestResponse
  7. 7. Reverse proxy cachingBrowser TYPO3(Apache + PHP + Mysql)Varnish
  8. 8. Reverse proxy cachingBrowser VarnishNginx TYPO3(Apache + PHP + Mysql)- SSL termination- (Compression)
  9. 9. Reverse proxy cachingBrowser VarnishNginx TYPO3(Apache + PHP + Mysql)
  10. 10. VarnishHTTPAcceleratorCachingReverse ProxyLoadBalancerFailoversystem„Varnish makes websites fly“
  11. 11. • Created by Poul-Henning Kamp• Varnish Configuration Language (VCL)– DSL, will be translated into C code and compiled• Varnish uses thread and memorymanagement of the operation system• Additional tools: varnishtop, varnishlog,…• Online-Documentation:http://www.varnish-cache.org/docs/2.1/Varnish
  12. 12. Stability
  13. 13. Efficiency
  14. 14. CPU load
  15. 15. Speed
  16. 16. • 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.vclInstallation
  17. 17. SetupVarnish VarnishLoadBalancerAmazon ELBF5VarnishTYPO3 backendTYPO3 frontends
  18. 18. Nginx, Varnish, Apache setup
  19. 19. Request Lifecycle (simplified)Complete workflow: http://www.varnish-cache.org/trac/wiki/VCLExampleDefault
  20. 20. • Vary: User-Agent(also implicitly set e.g. SetEnvIf)Pitfalls
  21. 21. Tools: Varnishhist
  22. 22. • Restart: Flushes complete cache• Reload: Reads VCL without flushing cacheRestart / Reload
  23. 23. BenchmarksTYPO3without cache3,45Pages/Second10,72Pages/Second855,78Pages/SecondTYPO3with cacheTYPO3with Varnish
  24. 24. • 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: publicSending correct headers
  25. 25. • http://forge.typo3.org/projects/show/extension-cacheinfoEXT:cacheinfo
  26. 26. • http://forge.typo3.org/projects/show/extension-purge• Configuration in VCL• Access protect• Purge using Shift+ReloadPurging
  27. 27. Punching Holes…http://www.flickr.com/photos/stevendepolo/3053981107/lightbox/
  28. 28. Punching holesESI AJAXCookie /Clientstorage
  29. 29. • Different lifetimes for clients and Varnish• Cache status codes > 400• Redirects• Protect the backend!Tuning
  30. 30. • Varnish (inkl. Dokumentation)http://www.varnish-cache.org• Poul-Henning Kamp at T3CON10http://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/fbrncFurther reading
  31. 31. Questions?Mail: fabrizio.branca@aoemedia.deTwitter: @fbrncBlog: http://www.fabrizio-branca.de

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