Steam Learn : Varnish or How to reduce the load of your web server
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What is Varnish Purpose of Varnish Varnish Request Life Cycle Performances : Apache vs Varnish Strength & Limitations Advanced features
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Steam Learn : Varnish or How to reduce the load of your web server
- 1. 22th of January, 2015 How to reduce the load of your web server With Varnish by Clément Beudot
- 2. 22th of January, 2015 Introduction ● What is Varnish ● Purpose of Varnish ● Varnish Request Life Cycle ● Performances : Apache vs Varnish ● Strength & Limitations ● Advanced features
- 3. 22th of January, 2015 Quick Quiz ! Calculate, without using your smartphone 45 x 12
- 4. 22th of January, 2015 Quick Quiz ! Calculate, without using your smartphone 45 x 12 = 540
- 5. 22th of January, 2015 Recurring Content
- 6. 22th of January, 2015 What is Varnish ● HTTP Reverse Proxy (HTTP Accelerator) ● Varnish 1.0 released in 2006, now version 4.0.2 ● Varnish written in C CLIENT VARNISH Web Server
- 7. 22th of January, 2015 Purpose of Varnish ● Scaling at thousands of req/s ● Caching recurring content ● Caching static resources ● Reducing load of your web servers
- 8. 22th of January, 2015 Varnish Request Life Cycle Few words to know first before seeing it ! 1. HIT : requested resource has been found in the cache 2. MISS : requested resource not found. 3. PASS : bypass of varnish 4. PIPE : direct passthrough to the backend (streams)
- 9. 22th of January, 2015 Varnish Request Life Cycle Cache Miss RECV HASH PIPE HIT MISS PASS FETCH DELIVER WEB SERVER
- 10. 22th of January, 2015 Varnish Request Life Cycle Cache Hit RECV HASH PIPE HIT MISS PASS FETCH DELIVER WEB SERVER
- 11. 22th of January, 2015 Varnish Request Life Cycle Cache Pass RECV HASH PIPE HIT MISS PASS FETCH DELIVER WEB SERVER
- 12. 22th of January, 2015 Varnish Request Life Cycle Cache Pipe RECV HASH PIPE HIT MISS PASS FETCH DELIVER WEB SERVER
- 13. 22th of January, 2015 Performances : Apache vs Varnish Using Varnish on a low complexity page ** SIEGE 2.70 ** Preparing 200 concurrent users. Transactions: 2298 hits Availability: 100.00 % Elapsed time: 29.83 secs Data transferred: 5.70 MB Response time: 0.00 secs Transaction rate: 77.04 trans/sec Longest transaction: 0.01 secs Shortest transaction: 0.00 secs ** SIEGE 2.70 ** Preparing 200 concurrent users. Transactions: 1763 hits Availability: 100.00 % Elapsed time: 29.99 secs Data transferred: 4.36 MB Response time: 0.76 secs Transaction rate: 58.79 trans/sec Longest transaction: 1.88 secs Shortest transaction: 0.07 secs
- 14. 22th of January, 2015 Performances : Apache vs Varnish Using Varnish on high complexity page ** SIEGE 2.70 ** Preparing 200 concurrent users. Transactions: 2298 hits Availability: 100.00 % Elapsed time: 29.83 secs Data transferred: 5.70 MB Response time: 0.00 secs Transaction rate: 77.04 trans/sec Longest transaction: 0.01 Shortest transaction: 0.00 ** SIEGE 2.70 ** Preparing 200 concurrent users. Transactions: 65 hits Availability: 100.00 % Elapsed time: 29.59 secs Data transferred: 1.35 MB Response time: 14.97 secs Transaction rate: 2.20 trans/sec Longest transaction: 28.22 secs Shortest transaction: 1.39 secs ** SIEGE 2.70 ** Preparing 200 concurrent users. Transactions: 2390 hits Availability: 100.00 % Elapsed time: 29.84 secs Data transferred: 49.49 MB Response time: 0.00 secs Transaction rate: 80.09 trans/sec Longest transaction: 0.01 secs Shortest transaction: 0.00 secs
- 15. 22th of January, 2015 Performances : Apache vs Varnish Really easy for Varnish !
- 16. 22th of January, 2015 Varnish Strengths ● Scaling to thousands of reqs/ s ● Load Balancing capability with Backend Health Check ● Ability to Manage the request life cycle ● Easy to partially integrate in your S.I
- 17. 22th of January, 2015 Varnish Limitations ● HTTPS ● Only designed for GET & HEAD request ● Hates Cookies & HTTP Auth Headers ● Not recommended on 32 bits servers ● Using Varnish for a logged user on your website
- 18. 22th of January, 2015 Varnish Limitations
- 19. 22th of January, 2015 Varnish : Advanced Features & Assets ● E.S.I. Support ● Control varnish via CLI or dedicated modules ● “Always online”
- 20. 22th of January, 2015 How to reduce the load of your web server with varnish - Summary ● HTTP Accelerator / HTTP Reverse Proxy ● Get rid of recurring content cost ● Scale at “nearly” zero cost ● And finally … reduce the load of your web server by avoiding unnecessary calculation.
- 21. 22th of January, 2015 How to reduce the load of your web server with varnish Thank You
- 22. 22th of January, 2015 How to reduce the load of your web server with varnish Questions ? How to install it ? Do I really need Varnish ? Can I cache in a file instead of RAM ? How I can change the TTL for a page ? What if all my backends are dead ? Can I use varnish for my logged users ? Is Varnish really useful for static content ? Can I load balance on multiple backends ? How much RAM do I need ?
- 23. 29th of January, 2015 Join the community ! (in Paris) Social networks : ● Follow us on Twitter : https://twitter.com/steamlearn ● Like us on Facebook : https://www.facebook.com/steamlearn SteamLearn is an Inovia initiative : inovia.fr You wish to be in the audience ? Join the meetup group! http://www.meetup.com/Steam-Learn/