Thijs Feryn: Varnish - where devops & sysadmins meet

•

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Varnish Software

Amsterdam summit 2015

Technologie

Where developers
& sysadmins meet
By Thijs Feryn
Varnish

Optimizedatabase
Optimizeruntime
Avoid
Avoid

✓State
✓Performance
✓Scalability
✓Cache invalidation
✓Architecture
People often forget

Varnishstill
considereda
sysadmin
responsibility

✓No state unless required
✓Cache-control discipline
✓Chop pages into content
blocks
✓AJAX or ESI
✓Reasonable cache
variations
✓Cache invalidation strategy
Advice for developers

✓Normalize input
✓Cookies blacklist/whitelist
✓URL blacklist/whitelist
VCL

RESTCacheable

in
Varnish
if

done
right

Async,
concurrent&
non-blocking
processing

Well-designed
software should
be more scalable

Well-designed
software doesn’t
need much
caching?

Well-designed
software doesn’t
require much VCL

Well-designed
software knows
how to purge the
cache

There are only two hard
things in Computer
Science: cache
invalidation and naming
things.
—- Phil Karlton

SSLtermination
+
SSL

awareness
in

application

Staticassets
To

cache
or
not

to
cache?
Invalidate

or
not?

Thijs Feryn: Varnish - where devops & sysadmins meet

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