{"id":52324,"date":"2019-11-06T00:00:00","date_gmt":"2019-11-05T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/hvatit-ispolzovat-smehotvorno-malyj-ttl-dlya-dns"},"modified":"2021-01-02T13:04:14","modified_gmt":"2021-01-02T11:04:14","slug":"hvatit-ispolzovat-smehotvorno-malyj-ttl-dlya-dns","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/hvatit-ispolzovat-smehotvorno-malyj-ttl-dlya-dns","title":{"rendered":"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Madala DNS-latents on v\u00f5tmet\u00e4htsusega tegur kiire interneti toimimises. Selle minimaalne hoidmine n\u00f5uab hoolikat DNS-serverite valimist ja <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/DNSCrypt\/dnscrypt-resolvers\/blob\/master\/v2\/relays.md\">anon\u00fc\u00fcmsed rerouted<\/a><\/noindex>. Kuid k\u00f5igepealt tuleb vabaneda tarbetutest p\u00e4ringutest.<\/p>\n<p>Just seet\u00f5ttu loodi DNS algselt v\u00e4ga vahem\u00e4llu salvestatava protokollina. Domeeni administraatorid seadistavad eluea (TTL) \u00fcksikutele kirjadele, ja resolvijad kasutavad seda teavet kirjade m\u00e4lu hoidmiseks, et v\u00e4ltida tarbetut liiklust.<\/p>\n<p>Kas vahem\u00e4llu salvestamine on efektiivne? M\u00f5ni aasta tagasi n\u00e4itas mu v\u00e4ike uurimus, et see ei ole ideaalne. Vaatame praegust olukorda.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nTeabe kogumiseks parandasin ma <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jedisct1\/encrypted-dns-server\">Encrypted DNS Server<\/a><\/noindex> TTL v\u00e4\u00e4rtuse s\u00e4ilitamiseks vastuse jaoks. See m\u00e4\u00e4ratletakse kui kirjade minimaalne TTL, iga sisenemise p\u00e4ringu jaoks. See annab hea \u00fclevaate reaalsete liikluse TTL jaotumisest ning arvestab \u00fcksikute p\u00e4ringute populaarsust. Parandatud serveri versioon t\u00f6\u00f6tas paar tundi.<\/p>\n<p>Tulemuste andmeid on 1&nbsp;583&nbsp;579 kirjet (nimi, qtype, TTL, ajatempleid). Siin on TTL \u00fcldine jaotus (X-telg on TTL sekundites):<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/ce19a1ceb07e1fd2f3b2284f86271eac.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>Kui mitte arvestada v\u00e4henenud tippu 86&nbsp;400 (peamiselt SOA kirjeid), on \u00fcsna selge, et TTLid on madalal vahemikus. Vaatame l\u00e4hemalt:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/abbe48952b616e1c5bdb18c2dc103dc7.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>Noh, TTL, mis on pikem kui 1 tund, ei ole statistiliselt oluline. Seega keskendume vahemikule 0\u22123600:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/f8a88267e1868a55d9234f66ad8c5dee.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>Enamik TTL-d on vahemikus 0 kuni 15 minutit:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/aab650c806097513a5924e5262211ea5.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>Valdav enamus on vahemikus 0 kuni 5 minutit:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/736af4b33b745fb0d5070200fa511426.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>See ei ole eriti hea.<\/p>\n<p>Kumulatiivne jaotumine muudab probleemi veelgi selgemaks:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/a3a4f03188dd6dbbf4558076b827f6a5.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>Pooltes DNS-vastustes on TTL 1 minut v\u00f5i v\u00e4hem ning kolmandikul on 5 minutit v\u00f5i v\u00e4hem.<\/p>\n<p>Aga oota, tegelikult on asi veel hullem. See TTL on autoriteetsete serverite poolt. Siiski saavad kliendi resolvijad (nt ruuteri, kohalikud vahem\u00e4lud) TTL k\u00f5rgemalt resolvijalt ning see v\u00e4heneb iga sekundi j\u00e4rel.<\/p>\n<p>Seega saab klient tegelikult igat kirjet keskmiselt kasutada poole algsest TTL-ist, p\u00e4rast mida saadab ta uue p\u00e4ringu.<\/p>\n<p>V\u00f5ib-olla, et need v\u00e4ga madalad TTL-id puudutavad ainult ebatavalisi p\u00e4ringuid, mitte populaarseid veebisaite ja API-sid? Vaadakem:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/2680f9669a90f449a593edcc84ca0dc8.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>X-telg on TTL, Y-telg on p\u00e4ringute populaarsus.<\/p>\n<p>Kahjuks on k\u00f5ige populaarsemate p\u00e4ringute vahem\u00e4llu salvestamine k\u00f5ige halvem.<\/p>\n<p>L\u00e4heneme sellele:<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/c670382b195169779743f43fd7b15827.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>Kohtuotsus: k\u00f5ik on t\u00f5esti halvasti. Juba eelnevalt oli halb, kuid n\u00fc\u00fcd on veel hullem. DNS-i vahem\u00e4lu on muutunud praktiliselt kasutuks. Kuna \u00fcha v\u00e4hem inimesi kasutab oma pakkuja DNS-resolvrid (m\u00f5istetavatel p\u00f5hjustel), muutub viivitus m\u00e4rgatavamaks.<\/p>\n<p>DNS-i vahem\u00e4lu on kasulik ainult sisu jaoks, mida keegi ei k\u00fclastanud.<\/p>\n<p>Pange t\u00e4hele, et tarkvara v\u00f5ib <noindex><a rel=\"nofollow\" href=\"https:\/\/00f.net\/2011\/11\/17\/how-long-does-a-dns-ttl-last\/\">erinevalt<\/a><\/noindex> t\u00f5lgendada madalaid TTL-e.<\/p>\n<h1>Miks nii?<\/h1>\n<p>Miks on DNS-i kirjade jaoks seatud nii madal TTL?<\/p>\n<ul>\n<li>Aegunud koormuse tasakaalustajad on j\u00e4\u00e4nud vaike seadistustega.<\/li>\n<li>Levitavad m\u00fc\u00fcdid, et DNS-i koormuse jaotus s\u00f5ltub TTL-ist (see pole t\u00f5si&nbsp;\u2014 alates Netscape Navigatorist valivad kliendid juhusliku IP-aadressi RR-hulga seast ja proovivad sujuvalt teist, kui ei saa \u00fchendust).<\/li>\n<li>DNS-serveri administraatorid soovivad muudatusi kohe rakendada, seet\u00f5ttu on see lihtsam planeerida.<\/li>\n<li>DNS-serveri v\u00f5i koormuse tasakaalustaja administraator peab oma \u00fclesandeks t\u00f5husalt rakendama konfiguratsiooni, mida kasutajad n\u00f5uavad, mitte kiirendama veebilehtede ja teenuste t\u00f6\u00f6d.<\/li>\n<li>Madalamad TTL-id annavad meelerahu.<\/li>\n<li>Inimesed seadistavad alguses madalad TTL-id katsetamiseks ja unustavad need hiljem muuta.<\/li>\n<\/ul>\n<p>Ma ei lisanud \u201ejuhtimissektoreid\u201c nimekirja, kuna see muutub \u00fcha v\u00e4hem asjakohaseks. Kui peate suunama kasutajad teise v\u00f5rku ainult vea lehe kuvamiseks, kui k\u00f5ik muu on katki, on t\u00f5en\u00e4oliselt lubatav viivitus \u00fcle 1 minuti.<\/p>\n<p>Lisaks t\u00e4hendab minuti TTL, et kui autoriteetsed DNS-serverid on blokeeritud rohkem kui 1 minut, ei saa keegi enam juurde p\u00e4\u00e4seda s\u00f5ltuvatele teenustele. Ja \u00fcleolekus ei aita, kui p\u00f5hjuseks on konfiguratsiooni t\u00f5rge v\u00f5i h\u00e4kkimine. Teiselt poolt, m\u00f5istlike TTL-idega j\u00e4tkab palju kliente eelmise konfiguratsiooni kasutamist ega m\u00e4rka kunagi midagi.<\/p>\n<p>Madala TTL-i eest on suures osas s\u00fc\u00fcdistada CDN-teenuseid ja koormuse tasakaalustajaid, eriti kui nad kombineerivad CNAME jooksva madala TTL-iga ja rekorditega, millel on samuti madalad (kuid s\u00f5ltumatud) TTL-id:<\/p>\n<pre>$ drill raw.githubusercontent.com\nraw.githubusercontent.com.\t9\tIN\tCNAME\tgithub.map.fastly.net.\ngithub.map.fastly.net.\t20\tIN\tA\t151.101.128.133\ngithub.map.fastly.net.\t20\tIN\tA\t151.101.192.133\ngithub.map.fastly.net.\t20\tIN\tA\t151.101.0.133\ngithub.map.fastly.net.\t20\tIN\tA\t151.101.64.133<\/pre>\n<p>Iga kord, kui CNAME v\u00f5i \u00fcksk\u00f5ik milline A-kirje aegub, tuleb saata uus p\u00e4ring. M\u00f5lema TTL on 30 sekundit, kuid need ei \u00fchti. Tegelik keskmine TTL on 15 sekundit.<\/p>\n<p>Aga oodake! K\u00f5ik on isegi hullem. M\u00f5ned resolverid k\u00e4ituvad sellistes olukordades, kus on kaks seotud madala TTL-iga, v\u00e4ga halvasti:<\/p>\n<pre>$ drill raw.githubusercontent.com @4.2.2.2\nraw.githubusercontent.com.\t1\tIN\tCNAME\tgithub.map.fastly.net.\ngithub.map.fastly.net.\t1\tIN\tA\t151.101.16.133<\/pre>\n<p>Level3 resolver t\u00f6\u00f6tleb ilmselt BIND-i. Kui te j\u00e4tkate selle p\u00e4ringu saatmist, tagastatakse alati TTL, mis on v\u00f5rdne 1. Sisuliselt, <code>raw.githubusercontent.com<\/code> ei cache'ita kunagi.<\/p>\n<p>Siin on veel \u00fcks selline olukord v\u00e4ga populaarse domeeniga:<\/p>\n<pre>$ drill detectportal.firefox.com @1.1.1.1\ndetectportal.firefox.com.\t25\tIN\tCNAME\tdetectportal.prod.mozaws.net.\ndetectportal.prod.mozaws.net.\t26\tIN\tCNAME\tdetectportal.firefox.com-v2.edgesuite.net.\ndetectportal.firefox.com-v2.edgesuite.net.\t10668\tIN\tCNAME\ta1089.dscd.akamai.net.\na1089.dscd.akamai.net.\t10\tIN\tA\t104.123.50.106\na1089.dscd.akamai.net.\t10\tIN\tA\t104.123.50.88<\/pre>\n<p>V\u00e4hemalt kolm CNAME-kirjet. Oi. \u00dchel on korralik TTL, kuid see on t\u00e4iesti kasutu. Teistes CNAME-des on algne TTL 60 sekundit, kuid domeenide <code>akamai.net<\/code> maksimaalne TTL on 20 sekundit ja \u00fckski neist ei ole faasis.<\/p>\n<p>Kuidas on domeenidega, mis pidevalt k\u00fcsivad Apple'i seadmete kaudu?<\/p>\n<pre>$ drill 1-courier.push.apple.com @4.2.2.2\n1-courier.push.apple.com.\t1253\tIN\tCNAME\t1.courier-push-apple.com.akadns.net.\n1.courier-push-apple.com.akadns.net.\t1\tIN\tCNAME\tgb-courier-4.push-apple.com.akadns.net.\ngb-courier-4.push-apple.com.akadns.net.\t1\tIN\tA\t17.57.146.84\ngb-courier-4.push-apple.com.akadns.net.\t1\tIN\tA\t17.57.146.85<\/pre>\n<p>Sama probleem, mis Firefoxil, ja TTL j\u00e4\u00e4b enamiku ajast 1 sekundi peale, kui kasutatakse Level3 resolverit.<\/p>\n<p>Dropbox?<\/p>\n<pre>$ drill client.dropbox.com @8.8.8.8\nclient.dropbox.com.\t7\tIN\tCNAME\tclient.dropbox-dns.com.\nclient.dropbox-dns.com.\t59\tIN\tA\t162.125.67.3\n\n$ drill client.dropbox.com @4.2.2.2\nclient.dropbox.com.\t1\tIN\tCNAME\tclient.dropbox-dns.com.\nclient.dropbox-dns.com.\t1\tIN\tA\t162.125.64.3<\/pre>\n<p>Kirje <code>safebrowsing.googleapis.com<\/code> TTL v\u00e4\u00e4rtus on 60 sekundit, nagu ka Facebooki domeenidel. Ja taas, kliendi seisukohalt, need v\u00e4\u00e4rtused v\u00e4henevad poole v\u00f5rra.<\/p>\n<h1>Kuidas oleks minimaalse TTL-i seadistamisega?<\/h1>\n<p>Kasutades nime, p\u00e4ringut\u00fc\u00fcpi, TTL-i ja algselt salvestatud ajatemplit, kirjutasin skripti, et simuleerida 1,5 miljoni p\u00e4ringu l\u00e4bimist l\u00e4bi vahem\u00e4luresolveri, et hinnata liigsete p\u00e4ringute hulka, mis saadetakse aegunud vahem\u00e4lukirje t\u00f5ttu.<\/p>\n<p>47,4% p\u00e4ringutest tehti p\u00e4rast olemasoleva kirje aegumist. See on p\u00f5hjendamatult k\u00f5rge.<\/p>\n<p>Milline oleks m\u00f5ju vahem\u00e4lule, kui minimaalse TTL-i seaksime?<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/3abd417d312450519b45f66865b23763.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>X-akse on TTL-i minimaalne v\u00e4\u00e4rtus. Kirjed, mille algne TTL on sellest v\u00e4\u00e4rtusest k\u00f5rgem, ei m\u00f5juta.<\/p>\n<p>Y-akse n\u00e4itab protsenti kliendi p\u00e4ringutest, kellel on juba vahem\u00e4llu salvestatud kirje, kuid selle kehtivusaeg on l\u00f5ppenud ning ta teeb uue p\u00e4ringu.<\/p>\n<p>Liigne p\u00e4ringute osakaal v\u00e4heneb 47% -lt 36% -le, kui seada minimaalne TTL 5 minutile. Kui minimaalne TTL on 15 minutit, v\u00e4heneb see osakaal 29% -le. Minimaalne TTL 1 tunni kohta v\u00e4hendab selle 17% -ni. Oluline erinevus!<\/p>\n<p>Kuidas oleks, kui te ei muudaks serveri poolt midagi, vaid seataksite minimaalset TTL-i kliendi DNS-vahem\u00e4lus (ruutereid, kohalikke resolvereid)?<\/p>\n<p><img decoding=\"async\" alt=\"L\u00f5peta naeruv\u00e4\u00e4rselt madala TTL-i kasutamine DNS-is\" src=\"\/wp-content\/uploads\/2019\/11\/107a2bd53797d421d65ac7260bf78dfe.jpg\" style=\"display:block;margin: 0 auto;\"><\/p>\n<p>N\u00f5utavate p\u00e4ringute arv v\u00e4heneb 47% -lt 34% -le, kui seada minimaalne TTL 5 minutile, 25% -ni minimaalsega 15 minutit ja 13% -ni minimaalsega 1 tund. V\u00f5ib-olla on optimaalne v\u00e4\u00e4rtus 40 minutit.<\/p>\n<p>Selle minimaalse muudatuse m\u00f5ju on tohutu.<\/p>\n<h1>Millised on tagaj\u00e4rjed?<\/h1>\n<p>Muidugi, teenuse saab \u00fcle viia uuele pilvepakkujale, uuele serverile, uuele v\u00f5rgu, n\u00f5udes klientidelt viimaste DNS-kirjete kasutamist. Ja piisavalt madal TTL aitab sujuvalt ja m\u00e4rkamatult seda \u00fcleminekut teostada. Kuid uusi DNS-kirjeid ei oodata, et kliendid aktsepteeriksid 1 minuti, 5 minuti v\u00f5i 15 minuti jooksul. Minimaalse eluea seadmine 40 minutile ei takista kasutajatel teenusele juurdep\u00e4\u00e4su.<\/p>\n<p>Kuid see v\u00f5imaldab oluliselt v\u00e4hendada viivitust ja suurendada privaatsust ning usaldusv\u00e4\u00e4rsust, v\u00e4ltides tarbetuid p\u00e4ringuid.<\/p>\n<p>Muidugi \u00fctleb RFC, et TTL-i tuleb rangelt j\u00e4rgida. Kuid reaalsus on see, et DNS-s\u00fcsteem on muutunud liiga ebaefektiivseks.<\/p>\n<p>Kui teie t\u00f6\u00f6tab autoritatiivsete DNS-serveritega, palun kontrollige oma TTL-e. Kas teil t\u00f5esti on vaja nii absurdelt madalaid v\u00e4\u00e4rtusi?<\/p>\n<p>Muidugi on olemas ka p\u00f5hjusi, miks seada madalaid TTL-e DNS-kirjadele. Kuid mitte 75% DNS-i liiklusest, mis praktiliselt ei muutu.<\/p>\n<p>Ja kui mingitel p\u00f5hjustel peate t\u00f5eliselt kasutama madalaid TTL-e DNS-ile, veenduge samas, et teie saidil pole aktiivne vahem\u00e4lumine. Sama p\u00f5hjusel.<\/p>\n<p>Kui teil on t\u00f6\u00f6tav kohalik DNS-vahem\u00e4lu, nagu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/dnscrypt\/dnscrypt-proxy\">dnscrypt-proxy<\/a><\/noindex>, mis v\u00f5imaldab seada minimaalset TTL-i, kasutage seda funktsiooni. See on t\u00e4iesti normaalne. Midagi halba ei juhtu. Seadke minimaalne TTL umbes 40 minuti (2400 sekundi) ja 1 tunni vahele. T\u00e4iesti m\u00f5istlik vahemik.<\/p>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/474450\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0438\u0437\u043a\u0430\u044f \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0430 DNS \u2014 \u043a\u043b\u044e\u0447\u0435\u0432\u043e\u0439 \u0444\u0430\u043a\u0442\u043e\u0440 \u0434\u043b\u044f \u0431\u044b\u0441\u0442\u0440\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u044b \u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435. \u0427\u0442\u043e\u0431\u044b \u0435\u0451 \u043c\u0438\u043d\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c, \u0432\u0430\u0436\u043d\u043e \u0442\u0449\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043f\u043e\u0434\u043e\u0431\u0440\u0430\u0442\u044c DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u044b \u0438 \u0430\u043d\u043e\u043d\u0438\u043c\u043d\u044b\u0435 \u0440\u0438\u043b\u0435\u0438. \u041d\u043e \u043f\u0435\u0440\u0432\u044b\u043c \u0434\u0435\u043b\u043e\u043c \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0438\u0437\u0431\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u043e\u0442 \u0431\u0435\u0441\u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u0418\u043c\u0435\u043d\u043d\u043e \u043f\u043e\u044d\u0442\u043e\u043c\u0443 DNS \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u043b\u0441\u044f \u043a\u0430\u043a \u0441\u0438\u043b\u044c\u043d\u043e \u043a\u044d\u0448\u0438\u0440\u0443\u0435\u043c\u044b\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b. \u0410\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u044b \u0437\u043e\u043d \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0442 \u0432\u0440\u0435\u043c\u044f \u0436\u0438\u0437\u043d\u0438 (TTL) \u0434\u043b\u044f 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