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Leszek Krupiński
April 11, 2014
Technology
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Varnish to the Rescue
Introduction to Varnish. Basics & pitfalls. Presented at techfusion.io
Leszek Krupiński
April 11, 2014
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Transcript
Varnish to the rescue Leszek Krupiński
@leafnode PHPers Manual Consultant Architect
intro
web 1. User 2. Browser 3. Server
user is impatient
fast!
100ms
1s = -11% Page Views -16% User Satisfaction -7% Conversion
1-5s ! 32% consumers lost
(2012) average: 2.45s
Optimize application
• Frameworks • Limits • Time-consuming operations • Cost
Maybe it’s not needed?
Cache!
Many levels, many solutions
But… my site is very dynamic!
1s TTL
From 20 rq/s to 1 rq/s in single apt-get install
Fresh content takes most hits
Varnish The Web Accelerator
None
None
None
Architecture
Works with the kernel not against it
mmap, threads, epoll, kqueue
Backends: memory, file
If it fits in memory, use memory
Works on HTTP headers
Cache-control, If-Modified-Since, Expires, Pragma, If-None-Match, Etag, Vary, Age
Varnish uses language both browser and backend know
In-memory logs
75 000 rq/s at TMECC 143 000 rq/s at Redpill-Linpro
Do I need a lot of memory?
Nope
Fresh content takes most hits
Take that, slashdot effect!
Configuration
Lots of possibilities
Unfortunately, lots of possibilities
Varnish Configuration Language
Compiled directly to C
Hook-like configuration
vcl_fetch vcl_recv vcl_hit vcl_miss vcl_hash vcl_pass vcl_deliver vcl_error
None
restart
Objects req, bereq, resp, beresp, obj
Defaults
vcl_recv
None
None
None
vcl_hash
None
VMods
throttle, cookie, shield, redis, memcached, curl, url code, redirect…
Varnish: load balancer failover system
None
Directors
Default: random
Round-robin, client, hash, dns
Health check
None
Saint mode
Grace mode
Two hard things
Invalidate cache
Ban list Efficient way to invalidate cache
Over HTTP
Use PURGE header
None
None
None
Real life issues
Cookies
Varnish does not cache when cookies are involved
Ignore cookies
None
Pick cookies
None
Pick URLs
None
Redirects
POST
PHP sessions
CURL VMod
None
None
PHP + memcached
None
mobile detection
None
mobile detection II
None
VMod: DeviceAtlas Mobile Detection
Cache “one-time” data
Example: dynamic image resizing
1B pictures 10 sizes
apache + moddims
Fresh content takes most hits
Different TTL for different parts?
ESI!
None
None
Testing?
jQuery plugin
Just in! Varnish 4.0
Log query language, background fetch, byte counters, security improvements
http://speakerdeck.com/leafnode