By Massimo Mollica Infrastructure Optimization Using Varnish Plus
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By Massimo Mollica
Infrastructure Optimization Using Varnish Plus
CBC/Radio-Canada is Canada's national public broadcaster and one of its largest cultural institutions.
The Corporation is a leader in reaching Canadians on all new platforms and delivers a comprehensive range of radio, television, internet, and satellite-based services.
Deeply rooted in the regions (50+ regional & 17+ foreign bureaus), CBC/Radio-Canada is the only domestic broadcaster to offer diverse regional and cultural perspectives in English, French and eight Aboriginal languages.
ABOUT CBC/RADIO-CANADA
6 million Average Daily unique
visitors
WWW.CBC.CA
▪ Reduce origin footprint and cost ▪ Capital expenses and hardware refresh ▪ Operating (systems admin, power, maintenance)
▪ Reliability ▪ Varnish provides CBC with “uninterrupted service”
▪ Speed ▪ Backend Performance “Accelerator”
WHY USE VARNISH?
▪ Core Business: “Keep the content as fresh as possible”
▪ IT: “Keep the configuration as simple as possible”
▪ Finance: “Keep our costs as low as possible”
CONFLICTING REQUIREMENTS
▪ Keep caching rules simple ▪ Is the default “good enough”?
▪ Tune at the origin first rather than at the edge ▪ Reduces propagation time for TTLs during emergencies
▪ Understand and categorize content before tuning
OVERALL LESSONS LEARNED
▪ Fine tuning of object TTLs ▪ Default blanket site-TTL for all objects except HTML ▪ Use of Varnish, ability to adjust TTLs during special
events or emergency situations
▪ Leveraging “Varnish Cache Plus” ▪ Enhanced use of Cache Policies for the rest of
www.cbc.ca
HOW WE DID IT
HOW WE DID IT
▪ More content served from Varnish Cache ▪ Origin Offload went from mid 50% to mid 90% ▪ Origin Servers Bandwidth dropped by 40% ▪ Origin traffic normalized
▪ End-User experience improved ▪ Page Load Time and DOM interactive improved by >0.6s
▪ Before:9web+9Java+3Cache & After:3Web+3Java+2Cache
IMPACT
Servers Offload Impact
OUTAGE start time:6pm EST
OUTAGE ~7 TO 8 PM
OUTAGE 8:52PM
Questions?
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