Varnish Summit 2016

1. Thriving in a cloud provider ecosystem with Varnish &
upgrading from Varnish 3 to 4
Working with Varnish at-scale

2. Pinterest is a
platform to Discover,
Save, and Do the
things you love
2:50 PM 100%
2

3. 75+ Billion Pins
categorized by people into more than
1 Billion Boards
100 Million Active Users
3

4. 4
Varnish in Numbers
180k requests representing unique user
actions

5. 5
Resilient Design
Resilient systems, built on top of
unreliable cloud components

6. 6
Scaling for Users
Keeping backend servers up-to-date for
varnish

7. 7
Service Discovery
Serving configuration data at scale with
high availability

8. 8
Varnish Service
Unique service hooks, and inspecting the
varnish daemon

9. 9
Reliability
Monitoring, repairing and establishing a
development environment for varnish

10. 10
Http Accelerators
Working with http headers and
understanding the varnish state diagram

11. Varnish state diagram
◊ vcl_recv
vcl_hash
◊ vcl_hit / vcl_miss / vcl_pass
◊ vcl_fetch
◊ vcl_deliver

12. TCP kernel tuning
◊ net.core.somaxconn
◊ net.ipv4.tcp_max_syn_backlog
◊ net.core.netdev_max_backlog
◊ net.ipv4.ip_local_port_range
◊ net.ipv4.tcp_tw_reuse
◊ net.ipv4.tcp_tw_recycle
net.ipv4.tcp_orphan_retries
◊ net.ipv4.tcp_slow_start_after_idle

13. 13
Varnish 4 Upgrades
A few features to look forward to &
working with varnish packages

14. 14
Upgrading VMODs
VMODS must be compiled against the
varnish version they will be run with.

15. 15
VCL Syntax Updates
varnish3to4 direct syntax updates and the
vmod_director addition

16. Pinterest believes having a team of dedicated, talented, authentic
people working collectively to innovate and build enables us to
move fast.
Karan Gupta
Jayme Cox
Josh Enders
Jeremy Carrol
Doc (Rogier Mulhuijzen - Fastly)

17. Thanks to Varnish-Cache for providing a place for us to come
together as a community at the Varnish Summit.
With special thanks to Alexandra Lehner