{"id":92998,"date":"2020-09-02T01:42:42","date_gmt":"2020-09-01T23:42:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/odna-iz-funkczij-chromium-sozdayot-ogromnuyu-nagruzku-na-kornevye-dns-servery"},"modified":"2020-09-02T01:42:42","modified_gmt":"2020-09-01T23:42:42","slug":"odna-iz-funkczij-chromium-sozdayot-ogromnuyu-nagruzku-na-kornevye-dns-servery","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/odna-iz-funkczij-chromium-sozdayot-ogromnuyu-nagruzku-na-kornevye-dns-servery","title":{"rendered":"\u00dcks Chromiumi funktsioon tekitab suurt koormust juurdomeeniserveritele","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"\u00dcks Chromiumi funktsioon tekitab suurt koormust juurdomeeniserveritele\" src=\"\/wp-content\/uploads\/2020\/09\/9991caf15ac312a6151bef193e75796d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nChromium on aktiivselt arenev avatud l\u00e4htekoodiga projekt, millel on Google Chrome'i ja uue Microsoft Edge'i taust, on t\u00e4helepanu k\u00f6itnud t\u00f5sise negatiivse t\u00e4helepanuga seoses funktsiooniga, mis oli algselt m\u00f5eldud heade kavatsustega: see kontrollib, kas kasutaja pakkuja ei \"varasta\" mitteeksisteerivaid p\u00e4ringutulemusi domeenidelt.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.chromium.org\/p\/chromium\/issues\/detail?id=1090985\">Intranet Redirect Detector<\/a><\/noindex>, luues vale p\u00e4ringuid juhuslike \"domeenide\" kohta, mille olemasolu on statistiliselt ebaoluline, on vastutav umbes poole \u00fcldise liikluse eest, mida juurdomeenide nimed saavad \u00fcle kogu maailma. Verisigni insener Matt Thomas kirjutas laiaulatusliku <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.apnic.net\/2020\/08\/21\/chromiums-impact-on-root-dns-traffic\/\">postitus<\/a><\/noindex> blogipostituse APNICis probleemi kirjeldamise ja selle ulatuse hindamisega.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Kuidas toimub DNS-i lahendamine<\/h2>\n<p>\n<img decoding=\"async\" alt=\"\u00dcks Chromiumi funktsioon tekitab suurt koormust juurdomeeniserveritele\" src=\"\/wp-content\/uploads\/2020\/09\/5499edffcfd83884bfbc934315cfc98f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Need serverid on k\u00f5rgeim instants, mille poole tuleks p\u00f6\u00f6rduda .com, .net jne lahendamiseks, et teavitada teid, et frglxrtmpuf ei ole \u00fclemine domeen (TLD).<\/i><\/p>\n<p>DNS, ehk domeeninime s\u00fcsteem, on s\u00fcsteem, t\u00e4nu millele saavad arvutid t\u00f5lkida meeldej\u00e4\u00e4vaid domeeninimesid nagu arstechnica.com palju v\u00e4hem mugavateks IP-aadressideks, n\u00e4iteks 3.128.236.93. Ilma DNS-ita ei saaks Internet eksisteerida inimkeelsetes vormides, seega on \u00fclemise taseme infrastruktuurile liialdatud koormus t\u00f5eline probleem.<\/p>\n<p>\u00dche kaasaegse veebilehe laadimiseks v\u00f5ib olla vajalik uskumatult suur hulk DNS-p\u00e4ringute toiminguid. N\u00e4iteks, kui anal\u00fc\u00fcsisime ESPN-i peamist lehte, lugesime 93 erinevat domeeninime alates a.espncdn.com kuni z.motads.com. K\u00f5ik need on vajalikud lehe t\u00e4ielikuks laadimiseks!<\/p>\n<p>Kuna s\u00fcsteem peab taluma kogu maailma teenindamise koormust, on DNS kavandatud kui mitmetasandiline hierarhia. Selle piramidi tipus asuvad juurdomeeni serverid \u2014 igal \u00fclemisel domeenil, nagu .com, on oma serverite perekond, mis on k\u00f5rgem instants iga madalamate domeenide jaoks. \u00dcks samm k\u00f5rgemal <em>needest<\/em> serveritest asuvad juurdomeeni serverid, alates <code>a.root-servers.net<\/code> kuni <code>m.root-servers.net<\/code>.<\/p>\n<h2>Kui tihti see juhtub?<\/h2>\n<p>\nT\u00e4nu DNS-i infrastruktuuri mitmetasandilise vahem\u00e4cache'ile j\u00f5uab juurs\u00fcsteemide serveritesse v\u00e4ga v\u00e4ike osa maailma DNS-i p\u00e4ringutest. Enamik inimesi saab DNS-i lahendaja teavet otse oma teenusepakkujalt. Kui kasutaja seadmel on vaja teada, kuidas teatud veebisaidile p\u00e4\u00e4seda, saadetakse p\u00e4ring esmalt selle kohaliku teenusepakkuja halduses olevale DNS-serverile. Kui kohalik DNS-server ei tea vastust, suunab ta p\u00e4ringu edasi oma \"edastuste serveritele\", kui need on m\u00e4\u00e4ratud.<\/p>\n<p>Kui ei kohaliku teenusepakkuja DNS-serveril ega tema konfigureeritud \"edastuste serveritel\" pole vahem\u00e4llu salvestatud vastust, t\u00f5stetakse p\u00e4ring otse domeeni volitatud serverile. <em>\u00fcle<\/em> selle, mille soovite muuta. Juhul kui <code>domeen.com<\/code> t\u00e4hendab, et p\u00e4ring saadetakse domeeni volitatud serveritele. <code>ok<\/code>, mis asuvad aadressil <code>gtld-servers.net<\/code>.<\/p>\n<p>S\u00fcsteem <code>gtld-servers<\/code>, millele p\u00e4ring on esitatud, vastab nime serverite loetelu domeeni domeen.com jaoks, samuti v\u00e4hemalt \u00fche siduva kirje, mis sisaldab \u00fche sellise nimiserveri IP-aadressi. Edasi edastatakse vastused allapoole - iga edastusserver edastab need vastused sellele serverile, mis neid k\u00fcsis, kuni vastus l\u00f5puks j\u00f5uab kohaliku teenusepakkuja serverisse ja kasutaja arvutisse. K\u00f5ik need salvestavad selle vastuse vahem\u00e4llu, et mitte h\u00e4irida k\u00f5rgema taseme s\u00fcsteeme.<\/p>\n<p>Enamikul juhtudel on nime serveri kirjed <strong>domeen.com<\/strong> juba vahem\u00e4lus \u00fche neist edastusserveritest, mist\u00f5ttu juurs\u00fcsteemi servereid ei h\u00e4irita. Kuid seni, kuni r\u00e4\u00e4gime meile tuntud URL-ist - selle, mis muudetakse tavaliseks veebisaitiks. Chrome'i p\u00e4ringud viitavad tasemele <em>\u00fcle<\/em> sellel, klastrite tasemel <code>root-servers.net<\/code>.<\/p>\n<h2>Chromium ja NXDomain'i r\u00f6\u00f6vimise kontroll<\/h2>\n<p>\n<img decoding=\"async\" alt=\"\u00dcks Chromiumi funktsioon tekitab suurt koormust juurdomeeniserveritele\" src=\"\/wp-content\/uploads\/2020\/09\/f089ac720a0d6e62be2f7c7c144f1d49.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Chromiumi kontrollimised \"kas see DNS-server ei peta mind?\" moodustavad peaaegu poole kogu liiklusest, mis j\u00f5uab Verisigni juurs\u00fcsteemide serverite klastrisse.<\/i><\/p>\n<p>Chromium, Google Chrome'i, uue Microsoft Edge'i ja lugematute v\u00e4hem tuntud brauserite vanemprojekt, soovib kasutajatele pakkuda lihtsust \u00fches otsinguv\u00e4ljas, mida m\u00f5nikord nimetatakse \u201eOmniboxiks\u201c. Teisis\u00f5nu, kasutaja sisestab nii tegelikud URL-id kui ka p\u00e4ringud otsingumootorisse samasse tekstiv\u00e4ljasse, mis asub brauseri akna \u00fclavarre. Tehes veel \u00fche sammu lihtsustamise suunas, ei n\u00f5ua see ka kasutajalt URL-i osa sisestamist <code>http:\/\/<\/code> v\u00f5i <code>https:\/\/<\/code>.<\/p>\n<p>Kuigi see on mugav, eeldab selline l\u00e4henemine, et brauser m\u00f5istaks, mida pidada URL-iks ja mida otsingup\u00e4ringuks. Enamikul juhtudel on see \u00fcsna ilmne \u2014 n\u00e4iteks, t\u00fchikute sisaldav rida ei saa olla URL. Kuid k\u00f5ik v\u00f5ib olla keerulisem, kui arvesse v\u00f5tta sisemisi v\u00f5rgustikke \u2014 privaatseid v\u00f5rgustikke, mis v\u00f5ivad samuti kasutada privaatseid tipp-domeene t\u00f5eliste veebisaitide lahendamiseks.<\/p>\n<p>Kui kasutaja oma ettev\u00f5tte sisev\u00f5rgus sisestab 'marketing', ja kui ettev\u00f5tte sisev\u00f5rgus on selle nimega sisemine veebisait, siis Chromium kuvab dialooge, k\u00fcsides kasutajalt, kas ta soovib otsida 'marketing' v\u00f5i minna. <code>https:\/\/marketing<\/code>. See on veel talutav, kuid paljud Interneti-teenuse pakkujad ja avalike Wi-Fi-v\u00f5rkude teenuse pakkujad 'varastavad' iga vale URL-i sisestuse, suunates kasutaja m\u00f5ne reklaamibanneritega lehele.<\/p>\n<h2>Juhuslik genereerimine<\/h2>\n<p>\nChromium'i arendajad ei soovinud, et kasutajad tavalistes v\u00f5rkudes n\u00e4eksid iga s\u00f5na otsingu puhul dialooge, k\u00fcsides, mida nad silmas pidanud, seet\u00f5ttu rakendasid nad testi: brauseri k\u00e4ivitamisel v\u00f5i v\u00f5rgu vahetamisel viib Chromium l\u00e4bi DNS-otsingu kolme juhuslikult genereeritud tippdomeeni \u00fcle 7 kuni 15 t\u00e4hem\u00e4rki. KuiNeed kahest p\u00e4ringust tagastatakse sama IP-aadressiga, oletab Chromium, et lokaalne v\u00f5rk 'varastab' vigasusi <code>NXDOMAIN<\/code>, mida ta peaks saama, seega peab brauser kuni edasise teavitamiseni k\u00f5iki \u00fches\u00f5nalisi p\u00e4ringuid otsingup\u00fc\u00fcdlusteks.<\/p>\n<p>Kahjuks on v\u00f5rkudes, mis <em>ei<\/em> varastab DNS-p\u00e4ringute tulemusi, need kolm toimingut tavaliselt \u00fclendatud k\u00f5ige k\u00f5rgemal tasemel, kuni nime s\u00fcsteemi juurkserveriteni: lokaalne server ei tea, kuidas teisendada <code>qwajuixk<\/code>, seet\u00f5ttu suunab see p\u00e4ringu oma edastamise serverile, mis teeb sama, kuni l\u00f5puks <code>a.root-servers.net<\/code> v\u00f5i \u00fcks tema<\/p>\n<p>vennas ei pea \u00fctlema: \"Vabandust, aga see ei ole domeen.\" <em>Kuna on umbes 1,67*10^21 v\u00f5imalikku vale domeeninime pikkusega seitsme kuni viieteistk\u00fcmne t\u00e4hem\u00e4rgiga, juhtub k\u00f5ige sagedamini<\/em> iga <em>nendest testidest, mis on tehtud \"ausas\" v\u00f5rgus, j\u00f5uab juure DNS-serverisse. See moodustab lausa<\/em> pool <code>root-servers.net<\/code>kogu koormusest juure DNS-ile, kui uskuda Verisign'i statistikat.<\/p>\n<h2>Ajalugu kordub<\/h2>\n<p>\nSee ei ole esimene kord, kui k\u00f5ige paremate kavatsustega loodud projekt <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/NTP_server_misuse_and_abuse#D-Link_and_Poul-Henning_Kamp\">kogub<\/a><\/noindex> v\u00f5i peaaegu kogub avaliku ressursi jaoks vajalikku liiklust \u2014 see tuletab meelde pikka ja kurba lugu D-Linkist ning NTP-serverist (Network Time Protocol) Poul-Henning Campist 2000. aastate keskpaiku.<\/p>\n<p>2005. aastal sai FreeBSD arendaja Poul-Henning, kellel oli Taanis ainus Stratum 1 taseme Network Time Protocol server, ootamatu ja suure arve edastatud liikluse eest. L\u00fchidalt \u00f6eldes, oli p\u00f5hjuseks see, et D-Linki arendajad programmeerisid Stratum 1 NTP-serverite, sealhulgas Kamppa serveri, aadresse ettev\u00f5tte l\u00fclitite, marsruuterite ja juurdep\u00e4\u00e4supunktide p\u00fcsivara. See t\u00f5stis koheselt Kamppa serveri liikluse \u00fcheksa korda, mille t\u00f5ttu Taani Interneti-vahetus (Taani internetiliiklus vahetuspunkt) muutis tema hindamist \"Tasuta\"-lt \"9 000 dollarit aastas\"-le.<\/p>\n<p>Probleem ei seisnenud D-Link'i ruuterite arvu liiga suures koguses, vaid selles, et nad \"rikusid alluvussuhet\". Peaaegu nagu DNS, peaks NTP toimima hierarhiliselt \u2014 Stratum 0 taseme serverid edastavad teavet Stratum 1 serveritele, mis edastavad teavet Stratum 2 serveritele ja nii edasi, allapoole hierarhias. Tavaline koduruuter, l\u00fcliti v\u00f5i p\u00e4\u00e4supunkt, nagu need, kuhu D-Link on m\u00e4\u00e4ranud NTP-serverite aadressid, pidid saatma p\u00e4ringud Stratum 2 v\u00f5i Stratum 3 serverile.<\/p>\n<p>Chromium projekt, omades t\u00f5en\u00e4oliselt parimaid kavatsusi, kordas NTP probleemiga seotud probleemi DNS-i osas, laadides Interneti juure serverisse p\u00e4ringute hulgaga, mida nad kunagi ei pidanud t\u00f6\u00f6tlema.<\/p>\n<h2>Loodame varajase lahenduse<\/h2>\n<p>\nChromium projektis on avatud <noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.chromium.org\/p\/chromium\/issues\/detail?id=1090985\">viga<\/a><\/noindex>, mis n\u00f5uab selle probleemi lahendamiseks vaikimisi Intranet Redirect Detector'i v\u00e4ljal\u00fclitamist. Tuleb anda tunnustust Chromiumi projektile: viga avastati <em>enne<\/em>, kui Matt Thomas Verisign'ist t\u00f5mbas sellele tohutu t\u00e4helepanu oma <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.apnic.net\/2020\/08\/21\/chromiums-impact-on-root-dns-traffic\/\">postitusega<\/a><\/noindex> APNICi blogis. Viga tuvastati juunis, kuid see j\u00e4i unustusse kuni Thomase postituseni; p\u00e4rast postitust hakkas see olema hoolikalt j\u00e4lgitud.<\/p>\n<p>On lootust, et probleem lahendatakse peagi ja juurdomeeni DNS-serverid ei pea enam iga p\u00e4ev umbes 60 miljardile valele p\u00e4ringule vastama.<\/p>\n<p><\/p>\n<h4>Reklaami \u00f5igustes<\/h4>\n<p>\n<b>Eepilised serverid<\/b> \u2014 see on <noindex><a rel=\"nofollow\" href=\"https:\/\/vdsina.ru\/cloud-servers?partner=habr85\">Windows VPS<\/a><\/noindex> v\u00f5i Linux, kus on v\u00f5imsad AMD EPYC protsessorid ja v\u00e4ga kiired Intel NVMe kettad. Kiirustage tellima!<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/vdsina.ru\/cloud-servers?partner=habr85\"><img decoding=\"async\" alt=\"\u00dcks Chromiumi funktsioon tekitab suurt koormust juurdomeeniserveritele\" src=\"\/wp-content\/uploads\/2020\/09\/c4fecbb05095f808fa41a9a6d99a3407.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vdsina\/blog\/517166\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0411\u0440\u0430\u0443\u0437\u0435\u0440 Chromium, \u0430\u043a\u0442\u0438\u0432\u043d\u043e \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0438\u0439\u0441\u044f open-source-\u0440\u043e\u0434\u0438\u0442\u0435\u043b\u044c Google Chrome \u0438 \u043d\u043e\u0432\u043e\u0433\u043e Microsoft Edge, \u043e\u0431\u0440\u0430\u0442\u0438\u043b \u043d\u0430 \u0441\u0435\u0431\u044f \u0441\u0435\u0440\u044c\u0451\u0437\u043d\u043e\u0435 \u043d\u0435\u0433\u0430\u0442\u0438\u0432\u043d\u043e\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0438\u0437-\u0437\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0437\u0430\u0434\u0443\u043c\u044b\u0432\u0430\u043b\u0430\u0441\u044c \u0441 \u0431\u043b\u0430\u0433\u0438\u043c\u0438 \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u0438\u044f\u043c\u0438: \u043e\u043d\u0430 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442, \u043d\u0435 \u00ab\u043f\u043e\u0445\u0438\u0449\u0430\u0435\u0442\u00bb \u043b\u0438 \u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043d\u0435\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0434\u043e\u043c\u0435\u043d\u043e\u0432. Intranet Redirect Detector, \u0441\u043e\u0437\u0434\u0430\u044e\u0449\u0438\u0439 \u043f\u043e\u0434\u0434\u0435\u043b\u044c\u043d\u044b\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u044b \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b\u0445 \u00ab\u0434\u043e\u043c\u0435\u043d\u043e\u0432\u00bb, \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u0435 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043c\u0430\u043b\u043e\u0432\u0435\u0440\u043e\u044f\u0442\u043d\u043e, \u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u0435\u043d \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0437\u0430 \u043f\u043e\u043b\u043e\u0432\u0438\u043d\u0443 \u043e\u0431\u0449\u0435\u0433\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430, \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u043c\u043e\u0433\u043e \u043a\u043e\u0440\u043d\u0435\u0432\u044b\u043c\u0438 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