Optimera STHLM 2011 - Ragnar Lönn, Load Impact
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Transcript of Optimera STHLM 2011 - Ragnar Lönn, Load Impact
![Page 1: Optimera STHLM 2011 - Ragnar Lönn, Load Impact](https://reader036.fdocuments.in/reader036/viewer/2022062405/55659eddd8b42a0a768b4da9/html5/thumbnails/1.jpg)
Spektakulära krascherRagnar Lönn, Load Impact
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Spektakulära serverkrascher?
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Normalläge
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"Krasch"!
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"Krasch"!
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• studera.nu• sj.se• royalcourt.se• nasdaqomxnordicexchange.se• alliansen.se• ticnet.se• sl.se• midnattsloppet.se ("återkom efter kl 24")• svt.se• livenation.se
"Kraschade" svenska sajter
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Load Impact -
• Lasttest-tjänst• Användare kan starta egna lasttester
som simulerar många besökare mot en sajt, och ser hur snabbt sidor då levereras från sajten
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Habrahabr.ru
• Russian "Slashdot" clone• Alexa top 1000 site
(bigger than slashdot.org)
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Habrahabr.ru
• "Slashdotted" = verb.• Habrahabr.ru har sin egen motsvarande
term - the Habra effect ("to be habr'd")
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Habrahabr.ru-bloggen
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Habr'd by Habrahabr.ru
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Load Impact-bloggen
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Habrahabr.ru-bloggen
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Habr'd by Habrahabr.ru
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Load Impact-bloggen
"Today, we were habr'd because of an article about being habr'd because of an article about how to avoid being habr'd!"
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Biltvätten eller Amazon EC2?
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Min Hyundai
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Biltvätten
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Nästan samma
http://www.youtube.com/watch?v=r7nKEEnBPtw&feature=player_detailpage
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Amazon EC2/EBS
EC2 = Elastic Compute Cloud
• Virtuella maskiner (instanser)
EBS = Elastic Block Storage
• Virtuell datalagring
EBS används ofta av EC2-instanser
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Amazon EC2/EBS krasch
• 21:a April, 00:47 PDTÄndring av routing resulterar i "hängda" EBS-volymer i US East
• 23:e April, 18:15 PDT2.2% av EBS-volymerna ff nere
• 24:e April, 12:30 PDT1% av EBS-volymerna ff nere
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Amazon EBS
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Värt att tänka på
• Molnet ger kapacitet, men driftsäkerhet är alltid ditt eget ansvar
• Distribution av en tjänst över flera geografiska regioner kan vara vettigt
• Undvik EBS?• Redundanta tjänster, glöm inte att testa (Chaos
Monkey!)
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Bra läsning
http://aws.amazon.com/architecture/
http://highscalability.com/blog/2011/4/25/the-big-list-of-articles-on-the-amazon-outage.html
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Dags för en öl!