Varnish: where developers & sysadmins meet - Varnish Summit Amsterdam 2015

Varnish: where developers & sysadmins meet - Varnish Summit Amsterdam 2015

1. Where developers & sysadmins meet By Thijs Feryn Varnish
2. Hi, I’m Thijs
3. I’m @ThijsFeryn on Twitter
4. I’m an Evangelist At
5. I’m an at Evangelist
6. I’m a at board member
7. Early days
8. Down
9. Website performance?
10. More servers
11. Identify slowest part
12. Optimize database
13. Optimize runtime
14. After a while you hit the limits
15. Caching
16. Memcached or Redis
18. Optimize database Optimize runtime A void A void
19. Varnish
20. Hit rate?
21. Cookies?
22. Cache Control?
23. Developers Sysadmins
25. ✓State ✓Performance ✓Scalability ✓Cache invalidation ✓Architecture People often forget
26. Who writes the VCL?
27. Varnish still considered a sysadmin responsibility
29. Coaching developers & sysadmins
30. ✓No state unless required ✓Cache-control discipline ✓Chop pages into content blocks ✓AJAX or ESI ✓Reasonable cache variations ✓Cache invalidation strategy Advice for developers
31. ✓Normalize input ✓Cookies blacklist/whitelist ✓URL blacklist/whitelist VCL
32. When you respect HTTP
33. Developers are bridging the gap too
34. Collaboration & empathy AKA  DevOps
35. Architecture
36. Service Oriented Architecture
37. REST Cacheable   in  Varnish  if   done  right
38. Monolith vs Microservices
39. Distributed systems
40. Big Data & NoSQL
41. Async, concurrent & non-blocking processing
42. Common goal
43. Better end-user experience
44. Frameworks & CMS’es
46. Bullet proof?
47. Well-designed software should be more scalable
48. Well-designed software should be faster
49. Well-designed software doesn’t need much caching?
50. Always cache … when you can
51. Well-designed software doesn’t require much VCL
52. Well-designed software knows how to purge the cache
53. Challenges
54. Caching state of mind
55. Purging
56. There are only two hard things in Computer Science: cache invalidation and naming things. —- Phil Karlton
57. SSL termination +  SSL   awareness  in   application
58. Static assets To   cache  or  not   to  cache? Invalidate   or  not?
59. Clustering & HA
60. Varnish flow