T3DD12 Caching with Varnish
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This document discusses using Varnish as a reverse proxy and caching solution for websites to improve performance. Varnish sits in front of web servers like Apache and caches responses to reduce load. It can handle over 1 million visitors per day and 5000 concurrent users. The document provides information on installing and configuring Varnish, including using VCL configuration files. It also discusses techniques for purging caches, sending cache headers, and tuning Varnish for specific sites.
![• 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
Sending correct headers](https://image.slidesharecdn.com/t3dd12-varnish-120416071825-phpapp01-130527074702-phpapp02/85/T3DD12-Caching-with-Varnish-24-320.jpg)
T3DD12 Caching with Varnish
- 1. Make your website fly using Varnish Fabrizio Branca T3DD12
- 2. System Developer AOE media Wiesbaden TYPO3 & Magento Twitter: @fbrnc Blog: http://www.fabrizio-branca.de Fabrizio Branca
- 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 other reverse proxy solution? You?!
- 4. 1m visitors in 24h 5000 concurrent users
- 6. Reverse proxy caching Browser TYPO3 (Apache + PHP + Mysql) Request Response
- 7. Reverse proxy caching Browser TYPO3 (Apache + PHP + Mysql) Varnish
- 8. Reverse proxy caching Browser VarnishNginx TYPO3 (Apache + PHP + Mysql) - SSL termination - (Compression)
- 9. Reverse proxy caching Browser VarnishNginx TYPO3 (Apache + PHP + Mysql)
- 10. Varnish HTTP Accelerator Caching Reverse Proxy Load Balancer Failover system „Varnish makes websites fly“
- 11. • 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/ Varnish
- 12. Stability
- 13. Efficiency
- 14. CPU load
- 15. Speed
- 16. • In Ubuntu: sudo apt-get install varnish sudo vi /etc/default/varnish START=yes sudo /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 Installation
- 17. Setup Varnish Varnish Load Balancer Amazon ELB F5 Varnish TYPO3 backendTYPO3 frontends
- 18. Nginx, Varnish, Apache setup
- 19. Request Lifecycle (simplified) Complete workflow: http://www.varnish-cache.org/trac/wiki/VCLExampleDefault
- 20. • Vary: User-Agent (also implicitly set e.g. SetEnvIf) Pitfalls
- 22. • Restart: Flushes complete cache • Reload: Reads VCL without flushing cache Restart / Reload
- 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: public Sending correct headers
- 26. • http://forge.typo3.org/projects/show/extens ion-purge • Configuration in VCL • Access protect • Purge using Shift+Reload Purging
- 28. Punching holes ESI AJAX Cookie / Client storage
- 29. • Different lifetimes for clients and Varnish • Cache status codes > 400 • Redirects • Protect the backend! Tuning
- 30. • 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 Further reading
- 31. Questions? Mail: fabrizio.branca@aoemedia.de Twitter: @fbrnc Blog: http://www.fabrizio-branca.de