{"id":4143,"date":"2020-10-30T22:00:28","date_gmt":"2020-10-30T21:00:28","guid":{"rendered":"https:\/\/webhosting.de\/?p=4143"},"modified":"2025-02-19T18:55:55","modified_gmt":"2025-02-19T17:55:55","slug":"content-delivery-networks-what-cloudflare-does-so-special","status":"publish","type":"post","link":"https:\/\/webhosting.de\/sv\/content-delivery-networks-was-cloudflare-so-besonders-macht\/","title":{"rendered":"N\u00e4tverk f\u00f6r inneh\u00e5llsleveranser - Vad som g\u00f6r CloudFlare s\u00e5 speciellt"},"content":{"rendered":"<p>\"Ge oss fem minuter s\u00e5 h\u00e4mtar vi din <a href=\"https:\/\/webhosting.de\/sv\/eine-eigene-webseite-fuer-ihr-unternehmen-ja-oder-nein\/\">Webbplats<\/a> komma ig\u00e5ng\" \u00e4r vad den San Francisco-baserade leverant\u00f6ren CloudFlare lovar p\u00e5 sin egen webbplats. Det s\u00e4gs att det bara tar fem minuter att registrera sig hos CloudFare, v\u00e4lja en motsvarande taxa (plan) och ladda upp motsvarande webbplats till leverant\u00f6ren. F\u00f6rutsatt att den egna internetuppkopplingen \u00e4r tillr\u00e4ckligt snabb. Men CloudFlare lovar inte bara snabbhet utan ocks\u00e5 avancerade s\u00e4kerhetsl\u00f6sningar som en \"Web Application Firewall\" eller en \"Advanced Denial of Service Attack Mitgation\". Allt detta \u00e4r m\u00f6jligt tack vare kombinationen av tv\u00e5 tekniker: den ena \u00e4r relativt ny, den andra \u00e4r lika gammal som Internet, och tillsammans bildar de ett n\u00e4stan sj\u00e4lvf\u00f6rs\u00f6rjande \u00f6vergripande system.<\/p>\n<h2>Content Delivery Network - N\u00e4r molnen blir diffusa<\/h2>\n<p>I st\u00e4llet f\u00f6r en vanlig molntj\u00e4nst, till exempel \"Infrastructure as a Service\", fungerar det s\u00e5 kallade \"Content Delivery System\" p\u00e5 ett n\u00e5got annorlunda s\u00e4tt, eftersom Content Delivery Networks i st\u00e4llet f\u00f6r att vara koncentrerade till en enda punkt distribueras diffust \u00f6ver flera PoP:s (Points of Presence) och bildar ett n\u00e4tverk av diffust arrangerade moln. F\u00f6r CloudFlare inneb\u00e4r detta 43 datacenter i 32 l\u00e4nder. Det handlar dock inte bara om storlek utan ocks\u00e5 om att t\u00e4cka globala platser i s\u00e5 stor utstr\u00e4ckning som m\u00f6jligt. En beg\u00e4ran fr\u00e5n Sydafrika b\u00f6r inte ta l\u00e4ngre tid \u00e4n en beg\u00e4ran fr\u00e5n USA p\u00e5 grund av det geografiska l\u00e4get. <\/p>\n<p>N\u00e4tverket f\u00f6r inneh\u00e5llsleverans fungerar med ett tv\u00e5delat distributionssystem. Det finns en eller flera originalservrar och ett stort antal \"backbones\" eller replikaservrar som inneh\u00e5ller en kopia av den tillg\u00e4ngliga filen. Hur ofta en s\u00e5dan fil speglas, dvs. distribueras till replikaservrarna, beror till stor del p\u00e5 antalet beg\u00e4randen. Om en fil endast beg\u00e4rs s\u00e4llan kan det r\u00e4cka med ett f\u00e5tal backbones f\u00f6r att tillgodose efterfr\u00e5gan p\u00e5 ett tillfredsst\u00e4llande s\u00e4tt. Dessutom: Alla ryggraden \u00e4r inte \"inst\u00e4llda\" p\u00e5 samma s\u00e4tt. Vissa \u00e4r utformade f\u00f6r effektivitet, andra f\u00f6r snabbhet. Kombinationen av dessa b\u00e5da metoder garanterar en konsekvent f\u00f6rdelning i fr\u00e5ga om tid och hastighet, oavsett aktiv trafik.<\/p>\n<h2>Domain Name Server - Den logiska konsekvensen<\/h2>\n<p>Den andra delen av distributionssystemet \u00e4r dom\u00e4nnamnsservern. Detta tar hand om uppl\u00f6sningen av de leveranskedjor som tilldelats av ursprungsservern via DNS-baserad beg\u00e4ran om dirigering. Precis som p\u00e5 Internet kan backbones tilldelas unika ID:n, som DNS sedan kan anv\u00e4nda i sin <a href=\"https:\/\/webhosting.de\/sv\/datenbank-server\/\">Databas<\/a> har lagrat. F\u00f6r att en beg\u00e4ran ska kunna behandlas m\u00e5ste anv\u00e4ndaren omdirigeras till ett stamn\u00e4t, vilket kr\u00e4ver information som ID och IP. Det \u00e4r precis den informationen som DNS tillhandah\u00e5ller.<\/p>\n<p>CloudFlares DNS anv\u00e4nds dock inte enbart f\u00f6r den h\u00e4r uppgiften, utan fungerar ocks\u00e5 som en \"vanlig\" DNS som kan omvandla webbplatsers dom\u00e4nnamn till IP-adresser. \u00c4ven om det numera finns m\u00e5nga DNS som inte \u00e4r knutna till Internetleverant\u00f6rer, t.ex. openDNS eller Google Public DNS, \u00f6kar driften av en egen DNS s\u00e4kerheten f\u00f6r de webbplatser som lagras via CloudFlare, \u00e5tminstone i liten utstr\u00e4ckning, eftersom det \u00e4r m\u00f6jligt att reagera snabbare p\u00e5 attacker som har \"denial of service\" som m\u00e5l.<\/p>\n<h2>S\u00e4kerhetens tre pelare<\/h2>\n<p>I grova drag uppn\u00e5s CloudFlares h\u00f6ga s\u00e4kerhet genom ett system med tre pelare, n\u00e4mligen en webbaserad brandv\u00e4gg som s\u00e5 att s\u00e4ga \u00e4r placerad framf\u00f6r sj\u00e4lva webbplatsen, SSL-kryptering fr\u00e5n b\u00f6rjan till slut baserad p\u00e5 anv\u00e4ndarens egna eller f\u00f6redragna protokoll och algoritmer samt DNSSEC (DNS-Security), ett handshake-system f\u00f6r DNS-fr\u00e5gor som bygger p\u00e5 kryptografiska signaturer och som fungerar i flera lager. Dessutom m\u00f6jligg\u00f6r den egna DNS ett mycket b\u00e4ttre system f\u00f6r tidig varning f\u00f6r DDoS-attacker genom f\u00f6rb\u00e4ttrad \u00f6vervakning \"vid k\u00e4llan\", eftersom trafikens \"uppblossande\" m\u00e4rks redan h\u00e4r innan den faktiska webbplatsen p\u00e5verkas.<\/p>\n<h2>Liten konkurrens<\/h2>\n<p>F\u00f6r n\u00e4rvarande har CloudFlare ingen st\u00f6rre konkurrens. \u00c4ven om det finns andra leverant\u00f6rer - \u00e4ven fr\u00e5n stora f\u00f6retag - kommer det att bli sv\u00e5rt att sl\u00e5 CloudFlare fr\u00e5n tronen tack vare samarbetet med stora varum\u00e4rken och en l\u00e5ngtg\u00e5ende implementering. Men de g\u00f6r inte bara po\u00e4ng med tomma fraser, utan genom kombinationen av Content Delivery Network och Domain Name Server med alla tillh\u00f6rande f\u00f6rdelar har de skapat ett system d\u00e4r snabbhet och s\u00e4kerhet \u00e4r lika viktiga.<\/p>","protected":false},"excerpt":{"rendered":"<p>&#8222;Gib uns f\u00fcnf Minuten und wir werden deine Webseite auf Touren bringen&#8220; verspricht der in San Francisco ans\u00e4ssige Anbieter CloudFlare vollmundig auf seiner eigenen Seite. Lediglich f\u00fcnf Minuten soll es dauern, sich bei CloudFare zu registrieren, einen entsprechenden Tarif (Plan) zu w\u00e4hlen und die entsprechende Webseite beim Anbieter hochzuladen. Unter der Voraussetzung allerdings, das die 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