{"id":35939,"date":"2019-10-31T22:07:41","date_gmt":"2019-10-31T19:07:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kak-my-probivali-velikij-kitajskij-faervol-ch-1\/"},"modified":"2019-10-31T22:07:41","modified_gmt":"2019-10-31T19:07:41","slug":"kak-my-probivali-velikij-kitajskij-faervol-ch-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/kak-my-probivali-velikij-kitajskij-faervol-ch-1","title":{"rendered":"Kuidas me l\u00e4bistasime Suure Hiina tulem\u00fc\u00fcri (1. osa)","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tere k\u00f5igile!<\/p>\n<p><\/p>\n<p>Tere, mina olen Nikita \u2014 s\u00fcsteemiinsener ettev\u00f5ttest <strong>SEMrush<\/strong>. T\u00e4na r\u00e4\u00e4gin teile sellest, kuidas meie eesm\u00e4rgiks sai tagada meie teenuse semrush.com usaldusv\u00e4\u00e4rne t\u00f6\u00f6 Hiinas ning milliste probleemidega me selle k\u00e4igus kokku puutusime (arvestades meie andmekeskuse asukohta Ameerika \u00dchendriikide idakaldal).<\/p>\n<p><\/p>\n<p>See saab olema pikk lugu, jagatud mitmeks artikliks. R\u00e4\u00e4gin, kuidas meil k\u00f5ik toimus: alates t\u00e4iesti mittefunktsioneerivast teenusest Hiinas kuni teenuse kvaliteedini, mis vastab Ameerika versioonile. Luban, et see on huvitav ja kasulik. Nii et, hakkame pihta.<\/p>\n<p><\/p>\n<h2 id=\"problemy-kitayskogo-interneta\">Hiina interneti probleemid<\/h2>\n<p><\/p>\n<p>Isegi k\u00f5ige kaugem inimene v\u00f5rguadministreerimise spetsiifikast on v\u00e4hemalt korra kuulnud <strong>Suurest Hiina tulem\u00fcst<\/strong>. Oi, k\u00f5lab lahedalt, eks? Aga mis see tegelikult on, kuidas see t\u00f6\u00f6tab \u2014 see on p\u00e4ris keeruline k\u00fcsimus. Internetis on palju artikleid, mis sellega tegelevad, aga tehnilisest k\u00fcljest ei ole seda tulem\u00fc\u00fcris kunagi kirjeldatud. Mis pole muidugi \u00fcllatav. Tunnistan ausalt, et aasta jooksul ei suuda ma t\u00e4pselt \u00f6elda, kuidas see t\u00f6\u00f6tab, kuid v\u00f5in jagada oma t\u00e4helepanekuid ja praktilisi j\u00e4reldusi. Alustame kuulujuttudest selle tulem\u00fc\u00fcri kohta.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Selle tulem\u00fc\u00fcri \u00fcmber on palju kuulujutte. Kogume kokku peamised ja huvitavad neist \u00fchte nimekirja:<\/p>\n<p><\/p>\n<ul>\n<li>Google, Facebook, Twitter ja muud sarnased teenused on Hiinas blokeeritud ja ei t\u00f6\u00f6ta.<\/li>\n<li>Iga liiklus, mis l\u00e4bib Hiina piire, anal\u00fc\u00fcsitakse ja piiratakse masin\u00f5ppe abil (kahtlase liikluse korral), mis aeglustab selle liikumist, mis l\u00e4bib piiri.<\/li>\n<li>Hiina julgeolekuasutused murravad l\u00e4bi k\u00f5ik kr\u00fcpteeritud liikluse, mis l\u00e4heb nende tulem\u00fc\u00fcri kaudu.<\/li>\n<li>VPN-tunnelid ja IPSEC-tunnelid on ebastabiilsed, kukuvad kokku ja neid blokeeritakse pidevalt.<\/li>\n<li>Mida lihtsam on kr\u00fcpteerimine ja mida lihtsam on autentimiseks \/ andmete edastamiseks kasutatav parool, seda kiiremini see Hiina tulekahju seina l\u00e4bib.<\/li>\n<\/ul>\n<p><\/p>\n<p>Siin on, mida me nende kuulujuttude kohta teada saime:<\/p>\n<p><\/p>\n<ul>\n<li>Google, Facebook, Twitter ja teised sarnased teenused on t\u00f5epoolest blokeeritud (teie KOD), kuid paljud Google'i tehnilised domeenid, n\u00e4iteks, ei ole blokeeritud ja t\u00f6\u00f6tavad (n\u00e4iteks gstatic.com). Sealt j\u00e4reldub, et ei tasu ettevaatamatult k\u00f5rvaldada k\u00f5iki n\u00e4iliselt blokeeritud Google'i ja muid ressursse.<\/li>\n<li>Iga liikumine, mis \u00fcletab piiri, lisab t\u00f5epoolest aega m\u00e4rkimisv\u00e4\u00e4rse viivituse. Vaadake kahte tulemust. \u00dcks sait, \u00fcks leht, lihtne GET <em>curl<\/em>Esimene m\u00f5\u00f5tmine on otse Hiinast (ilus linn Shenzhen). Teine m\u00f5\u00f5tmine on v\u00e4ljastpoolt Hongkongist (omab suver\u00e4\u00e4nsust ja tema ning \u00fclej\u00e4\u00e4nud maailma vahel ei ole tulle). Linnade vahemaa on otseselt umbes 30-40 km.<\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"bash\">nikita@china-shenzhen:~# curl -o \/dev\/null -w@curl_time \"https:\/\/www.semrush.com\/info\/ebay.com\"\n  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current\n                                 Dload  Upload   Total   Spent    Left  Speed\n100  381k    0  381k    0     0  71824      0 --:--:--  0:00:05 --:--:-- 82832\ntime_namelookup:  0.004500\ntime_connect:  0.169342\ntime_appconnect:  0.723189\ntime_pretransfer:  0.723499\ntime_redirect:  0.000000\ntime_starttransfer:  1.532912\n----------\ntime_total:  5.443407\n----------\nsize_download:  390968 Bytes\nspeed_download:  71824.000B\/s\n\nnikita@china-hongkong:~# curl -o \/dev\/null -w@curl_time \"https:\/\/www.semrush.com\/info\/ebay.com\"\n  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current\n                                 Dload  Upload   Total   Spent    Left  Speed\n100  319k    0  319k    0     0  2555k      0 --:--:-- --:--:-- --:--:-- 2573k\ntime_namelookup:  0.029366\ntime_connect:  0.030742\ntime_appconnect:  0.047310\ntime_pretransfer:  0.047388\ntime_redirect:  0.000000\ntime_starttransfer:  0.120793\n----------\ntime_total:  0.124871\n----------\nsize_download:  326755 Bytes\nspeed_download:  2616740.000B\/s<\/code><\/pre>\n<p><\/p>\n<p>Pange t\u00e4hele <strong>time_connect<\/strong>. Ja kokkuv\u00f5ttes n\u00e4ete tulemust: tulem\u00fc\u00fcr lisab 4 sekundit juurde, mis on t\u00e4iesti liiga kaua.<\/p>\n<p><\/p>\n<ul>\n<li>VPN ja IPSEC- tunnelid t\u00f5epoolest sageli kukuvad. R\u00e4\u00e4gin sellest l\u00e4hemalt hiljem. <\/li>\n<li>On olemas arvamus inimestelt, kes elavad Hiinas, et mida lihtsam on liikluse kr\u00fcpteerimine, seda kiiremini see piirist l\u00e4bi l\u00e4heb, sest on lihtne m\u00f5ista, et selles ei ole midagi ebaseaduslikku. Samuti saab \"puhta\" liiklus suuremat ribalaiust ja kiiruset l\u00e4bimist, samas kui \"must\" liiklus, milles ei ole midagi arusaadavat, l\u00e4bib vastupidi aeglasemalt. <em>ifconfig.co<\/em> HTTPS ja HTTP protokolli kaudu. <\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"bash\">curl -o \/dev\/null -w@curl_time \"https:\/\/ifconfig.co\/\"\n  % Kogu    % Vastuv\u00f5etud % \u00dclekande Keskmine Kiirus   Aeg    Aeg     Aeg  Praegune\n                                 Laadimist  \u00dcleslaadimist   Kogu   Veedetud   J\u00e4\u00e4nud  Kiirus\n100    13  100    13    0     0      2      0  0:00:06  0:00:05  0:00:01     3\ntime_namelookup:  0.004305\ntime_connect:  0.397465\ntime_appconnect:  5.149305\ntime_pretransfer:  5.149393\ntime_redirect:  0.000000\ntime_starttransfer:  5.568847\n----------\ntime_total:  5.568893\n----------\nsize_download:  13 Bytes\nspeed_download:  2.000B\/s\n\ncurl -o \/dev\/null -w@curl_time \"http:\/\/ifconfig.co\/\"\n  % Kogu    % Vastuv\u00f5etud % \u00dclekande Keskmine Kiirus   Aeg    Aeg     Aeg  Praegune\n                                 Laadimist  \u00dcleslaadimist   Kogu   Veedetud   J\u00e4\u00e4nud  Kiirus\n100    13  100    13    0     0     28      0 --:--:-- --:--:-- --:--:--    28\ntime_namelookup:  0.004282\ntime_connect:  0.212457\ntime_appconnect:  0.000000\ntime_pretransfer:  0.212484\ntime_redirect:  0.000000\ntime_starttransfer:  0.450565\n----------\ntime_total:  0.450620\n----------\nsize_download:  13 Bytes\nspeed_download:  28.000B\/s<\/code><\/pre>\n<p><\/p>\n<p>5 sekundi erinevus 13 baiti laadimisajas. Samas, tehes sellist testi mitu korda, v\u00f5ib m\u00e4rgata, et GET HTTP kaudu l\u00f5ppeb \u00fcldiselt sama ajaga iga kord, samas kui HTTPS-i puhul reageerib sait m\u00f5nikord 3, 5, 10 ja isegi 17 sekundi p\u00e4rast. M\u00f5nikord esinevad SSL-i vead:<\/p>\n<p><\/p>\n<p><code>Tundmatu SSL-protokolli viga \u00fchenduses ifconfig.co:443.<\/code><\/p>\n<p><\/p>\n<p>Nii, mida me n\u00fc\u00fcd omame:<\/p>\n<p><\/p>\n<ul>\n<li>\u00dclaltoodud probleemid, mida tekitab Hiina tulem\u00fc\u00fcr.<\/li>\n<li>Pingid v\u00e4liste ressursside ja tunnelite sees aeg-ajalt kaovad.<\/li>\n<li>Latentsus kahe punkti vahel muutub pidevalt, ja sageli on see lihtsalt ettearvamatu. Erinevaid linnu\/regiona \u00fchendades lood, et geograafilise asukoha p\u00f5hjal on latentsus v\u00e4iksem, aga saad t\u00e4pselt vastupidise olukorra. <\/li>\n<li>Interneti ja sidekanalid t\u00f6\u00f6tavad m\u00f5nikord kiiresti, m\u00f5nikord aeglaselt. Siin on v\u00e4ike s\u00f5ltuvus \u00f6\u00f6ajast ja n\u00e4dalap\u00e4evast, kuid mitte alati.<\/li>\n<li>DNS-p\u00e4ringud Hiinast v\u00e4lismaailma m\u00f5nikord \u00fcletavad lubatud ajautumise.<\/li>\n<\/ul>\n<p><\/p>\n<p>Pilt joonistub lihtsalt 'suurep\u00e4rane'. <\/p>\n<p><\/p>\n<p>Andmed keskus, nagu juba \u00fctlesin, on meil Ameerika \u00dchendriikide idas, ning kogu SEMrush koosneb k\u00fcmnetest omavahel seotud toodetest, tagatud ja eesliidestest, andmebaasidest, ning k\u00f5ik see asub DCs ja pilvedes. Meie, s\u00fcsteemiadministraatorite meeskonnana, seiname \u00fclesanne oli kiiresti alustada t\u00f6\u00f6tamist Hiinas minimaalsete pingutustega.<\/p>\n<p><\/p>\n<p>Pidime vastama olulisele k\u00fcsimusele: kas saame v\u00e4ikeste pingutustega lahendada k\u00f5ik Hiina interneti ja tulem\u00fc\u00fcri probleeme v\u00f5rgu\/pilvede\/serverite tasandil?<\/p>\n<p><\/p>\n<p>Alustasime <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9B%D0%B8%D1%86%D0%B5%D0%BD%D0%B7%D0%B8%D1%8F_ICP\"><strong>ICP<\/strong>-litsentsist<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h2 id=\"icp-licenziya\">ICP-litsents<\/h2>\n<p><\/p>\n<p>Et olla v\u00f5imeline paigutama oma teenuseid Hiina (Mandri-Hiina) piires ja korraldama katseid, tuleb esmalt saada ICP-litsents domeeni jaoks.<\/p>\n<p><\/p>\n<p>Kui teie saidi kasutajate liiklus suunatakse Mandri-Hiinas ja teie domeenil ei ole ICP-luba, siis teie liiklus blokeeritakse teenusepakkuja\/hotelli poolt. Huvitav, et ICP-luba registreerib konkreetse teenusepakkuja, olgu selleks Cloudflare v\u00f5i Alibaba Cloud. Seet\u00f5ttu, kui olete saanud ICP-luba Cloudflare'i jaoks ja oma veebisaiti seal majutanud, ei saa te hiljem \u201esujuvalt\u201c Alibaba Cloudile \u00fcle minna. Selleks tuleb lisada veel \u00fcks hostimine selle litsentsi alla.<\/p>\n<p><\/p>\n<p>ICP-luba domeeni jaoks omades saime v\u00e4lja m\u00f5elda ja rakendada konkreetseid tehnilisi ideid ja lahendusi.<\/p>\n<p><\/p>\n<h2 id=\"testirovanie-resheniy\">Lahenduste testimine<\/h2>\n<p><\/p>\n<p>Kuid enne, kui hakkame looma stendi variante, reguleerima seadmeid, optimeerima saidi t\u00f6\u00f6d ja kiirus, peab valima testimist\u00f6\u00f6riista, et n\u00e4ha, millised meie tegevused parandavad v\u00f5i vastupidi halvendavad saidi t\u00f6\u00f6d.<\/p>\n<p><\/p>\n<p>Meie testimisriist peab vastama kahele peamisele n\u00f5udmisele:<\/p>\n<p><\/p>\n<ul>\n<li>see peab v\u00f5imaldama teste k\u00e4ivitada Hiinas,<\/li>\n<li>ja see peab sisaldama brauseriteste.<\/li>\n<\/ul>\n<p><\/p>\n<p>Nii leidsime <noindex><a rel=\"nofollow\" href=\"https:\/\/www.catchpoint.com\/\">Catchpoint<\/a><\/noindex>! Neil on suurep\u00e4rane katvus testimispunktide osas kogu maailmas. Hiinas saab selle t\u00f6\u00f6riista abil teste k\u00e4ivitada ka 100500 provintsist. Igas on mitu erinevat pakkujat + v\u00f5imalus teha <strong>Backbone<\/strong>-teste (midagi sarnast virtuaalmasinale andmekeskuses) ja <strong>Lastmile<\/strong>-teste (maksimaalselt l\u00e4hedased kasutustingimustele, aka t\u00f6\u00f6jaam). Viimane testit\u00fc\u00fcp on kallim.<\/p>\n<p><\/p>\n<p>Aastase lepingu s\u00f5lmimisega (v\u00e4hem pole v\u00f5imalik) alustasime t\u00f6\u00f6riista uurimist. Tunnistan, et olime selle funktsionaalsusest meeldivalt \u00fcllatunud. Saame k\u00e4ivitada:<\/p>\n<p><\/p>\n<ul>\n<li>DNS-testid,<\/li>\n<li>Veebi testid (brauser, lihtne GET\/POST, mobiilse kliendi emulatsioon jne),<\/li>\n<li>Tehingu kontrollid (n\u00e4iteks sisselogimine),<\/li>\n<li>API-testid,<\/li>\n<li>Ping, traceroute, NTP jne.<\/li>\n<\/ul>\n<p><\/p>\n<p>Kogu seda ei saa \u00fcles lugeda. Ja mis k\u00f5ige t\u00e4htsam, iga testi saab \u00fcsna h\u00e4sti kohandada, lisades hulga p\u00e4iseid ja muid parameetreid. Tulemuseks on tohutu hulk teavet, mis kirjeldab t\u00e4ielikult teie testi. Kui r\u00e4\u00e4kida meie jaoks k\u00f5ige huvitavamast (brauseritestidest), siis tulemus sisaldab:<\/p>\n<p><\/p>\n<ul>\n<li>Connect, Wait, Load, SSL, DNS aeg,<\/li>\n<li>TTFB, TTLB, Dokumendi t\u00e4itmine, Renderdamise aeg, DOM laadimine,<\/li>\n<li>Response (midagi, mis on sarnane Time To First Byte'ile), Webpage Response (midagi, mis on sarnane Time To Last Byte'ile),<\/li>\n<li>Iga percentile, Average, Median aeg<\/li>\n<li>Ja nii edasi.<\/li>\n<\/ul>\n<p><\/p>\n<p>Seega aitavad k\u00f5ik need m\u00f5\u00f5dikud suurep\u00e4raselt j\u00e4lgida muutusi ja m\u00f5ista, kas on paremini l\u00e4inud. Me uurisime peamiselt <strong>Response, Webpage Response, Median, 75. ja 95. percenti<\/strong>. <\/p>\n<p><\/p>\n<p>Oluline k\u00fcsimus, mis oli \u00f5hus alates algusest: <strong>kas v\u00f5ib usaldada Catchpoint'i?<\/strong>? \u041e\u0442\u0440\u0430\u0436\u0430\u0435\u0442 \u043b\u0438 \u044d\u0442\u043e\u0442 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0440\u0435\u0430\u043b\u044c\u043d\u0443\u044e \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0441\u0430\u0439\u0442\u0430 \u0432 \u041a\u0438\u0442\u0430\u0435 \u0438\u0437 \u0440\u0430\u0437\u043d\u044b\u0445 \u0433\u043e\u0440\u043e\u0434\u043e\u0432 \u0438\u043b\u0438 \u0436\u0435 \u044d\u0442\u043e \u043f\u0440\u043e\u0441\u0442\u043e \u043a\u0430\u043a\u043e\u0439-\u0442\u043e \u0442\u0435\u0441\u0442 \u0432 \u0432\u0430\u043a\u0443\u0443\u043c\u0435, \u043d\u0435 \u0438\u043c\u0435\u044e\u0449\u0438\u0439 \u043d\u0438\u0447\u0435\u0433\u043e \u043e\u0431\u0449\u0435\u0433\u043e \u0441 real user experience?<br \/>\nSee on suur probleem, kuna Venemaal on praktiliselt v\u00f5imatu usaldusv\u00e4\u00e4rselt teada, kuidas veebisait Hiinast t\u00f6\u00f6tab. Socks-proxy kaudu virtuaalmasina kaudu on tulemuseks veebisaidi laadimine paar minutit, mis on testide jaoks lihtsalt vastuv\u00f5etamatu, seega ainus k\u00e4sitsi testimise variant j\u00e4\u00e4b curl ja lihtsad GET k\u00e4sud konsoolist ajam\u00f5\u00f5tmiseks. See aitab, sest see test peegeldab h\u00e4sti v\u00f5rgu lahenduse t\u00f6\u00f6kiirust, ja kui on olemas ka brauseritestid, siis on see suurep\u00e4rane.<\/p>\n<p><\/p>\n<p>Hiljem k\u00e4isime ise Hiinas ja veendusime, et <strong>Catchpoint'i usaldada saab, see peegeldab \u00fcsna t\u00e4pselt reaalset t\u00f6\u00f6kiirus.<\/strong><\/p>\n<p><\/p>\n<h2 id=\"cloudflare-china-network\">Cloudflare Hiina v\u00f5rk<\/h2>\n<p><\/p>\n<p>Kuna peamise domeeni semrush.com puhul kasutame edukalt Cloudflare'i, otsustasime kohe proovida nende funktsiooni nimega <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cloudflare.com\/network\/china\/\">Hiina v\u00f5rk<\/a><\/noindex>. See valik on aktiveeritav ainult Enterprise-saitidele eraldi taotluse ja tasu eest. Samuti on see saadaval ainult saitidele, millel on vastav ICP-luba, kus pakkujana on m\u00e4rgitud Cloudflare. P\u00e4rast aktiveerimist on saidile saadaval Cloudflare'i \"Hiina CDN\" \u2013 liiklus Hiina piirkondadest j\u00f5uab l\u00e4himasse CF PoP-i (Presence Point), edasi toimetatakse see tema v\u00f5rkudes v\u00f5i partnerite v\u00f5rgu kaudu origini. <\/p>\n<p><\/p>\n<p>Allpool on esitatud selle testseina skeem.<\/p>\n<p><\/p>\n<p>See on meie jaoks suurep\u00e4rane lahendus. Tundub, et teine domeen on samuti CF-i all, mis ei suurenda ettev\u00f5ttes kasutatavate lahenduste arvu ning praktiliselt ei komplitseeri infrastruktuuri.<\/p>\n<p><\/p>\n<p>K\u00e4ivitame brauseritestid ja siin on tulemused:<\/p>\n<p><\/p>\n<p>Punased diamondid t\u00e4histavad testide eba\u00f5nnestumisi. Alumised eba\u00f5nnestumised on DNS vead (resolve timeout). \u00dclemised eba\u00f5nnestumised on aja\u00fcletused.<\/p>\n<p><\/p>\n<p><em>T\u00f6\u00f6aeg: 86,6<br \/>\nMediaan: 18s<br \/>\n75. percentiil: 29,3s<br \/>\n95. percentiil: 60s<\/em><\/p>\n<p><\/p>\n<p>Mediaan p\u00e4rast koormuse eemaldamist <em>reCaptcha<\/em> (Google'i teenus, mis on Hiinas blokeeritud), langes 28-lt 18 sekundile. Kuid need on ikkagi kohutavad n\u00e4itajad, kui arvesse v\u00f5tta, et sama testi jaoks semrush.com (USA-st) andis v\u00e4hem kui 10 sekundit 95% kasutajatele (USA-st) samal lehel (staatika + d\u00fcnaamika).<\/p>\n<p><\/p>\n<p>Iga testi saab vaadata ja uurida <em>Waterfall<\/em> ja muid \u00fcksikasjalikumaid parameetreid. Oleme hakanud uurima vigade p\u00f5hjuseid ja kui ajavahemikest on k\u00f5ik enam-v\u00e4hem selge: internet Hiinas \u201ckui t\u00f6\u00f6tab siis t\u00f6\u00f6tab, kui ei, siis ei t\u00f6\u00f6ta\u201d, siis on ressurside kiire laadimine v\u00e4ljastpoolt ebastabiilne ja varieeruv, siis DNS-vead \u00fcllatasid meid t\u00f5siselt. Avastasime, et <em>PoP<\/em> Cloudflare'il on t\u00f5epoolest Hiinas, veebisaidi aadress resolvib \u00fchte anycast IP-d, kuid kasutatavad DNS-serverid on Ameerikast, mist\u00f5ttu peavad DNS-p\u00e4ringud minema piiri l\u00e4bi, seet\u00f5ttu neil m\u00f5nikord eba\u00f5nnestuvad.<\/p>\n<p><\/p>\n<p>Selgitasime seda k\u00fcsimust CF-ilt ja selgus, et <strong>neil ei ole Hiinas oma DNS-servereid<\/strong>, ja kuna need seal olema hakkavad \u2014 ei ole seni teada.<\/p>\n<p><\/p>\n<p>Seet\u00f5ttu otsustasime testida ainult Cloudflare'i DNS-i ja muutsime Cloudflare'i t\u00f6\u00f6mehhanismi meie saidil re\u017eiimiks \u201c<strong>Ainult DNS<\/strong>See on selline re\u017eiim, kus Cloudflare ei suuna liiklust enda kaudu, mis t\u00e4hendab, et DDoS-kaitset, CDN-i ja muid funktsioone ei pakuta ning see t\u00f6\u00f6tab tavalise DNS-serveri re\u017eiimis. <\/p>\n<p><\/p>\n<p>Seda seadet on kujutatud j\u00e4rgmisel joonisel. Joonisel on arvesse v\u00f5etud uusi teadmisi sellest, et Cloudflare'i DNS-serverid on tulem\u00fc\u00fcrist taga.<\/p>\n<p><\/p>\n<p>Catchpointis k\u00e4ivitasime lihtsad GET-testid (mitte brauserip\u00f5hised), mis n\u00e4itasid palju t\u00f5rkeid. Nende p\u00f5hjuseks olid k\u00f5ik samad DNS-vead.<\/p>\n<p><\/p>\n<p>Alustasime nende vigade t\u00f5rgetega <em>dig<\/em> ja avastasime, et esimesel p\u00e4ringul m\u00e4\u00e4ratakse aadress \u00f5igesti, kuid igasuguste j\u00e4rgmiste p\u00e4ringute korral saame pidevalt <em>SERVFAIL<\/em> ja <em>leiutatud<\/em>. Kust see n\u00fc\u00fcd tuli?<\/p>\n<p><\/p>\n<pre><code class=\"bash\">root@iZwz97n2wgbp61qucbfrjsZ:~# host semrushchina.cn\nsemrushchina.cn on aadress 220.170.186.192\nHost semrushchina.cn ei leitud: 2(SERVFAIL)\nroot@iZwz97n2wgbp61qucbfrjsZ:~# host semrushchina.cn\nsemrushchina.cn on aadress 220.170.186.192\nHost semrushchina.cn ei leitud: 2(SERVFAIL)\nroot@iZwz97n2wgbp61qucbfrjsZ:~# host semrushchina.cn\nsemrushchina.cn on aadress 220.170.186.192\nHost semrushchina.cn ei leitud: 2(SERVFAIL)\nroot@iZwz97n2wgbp61qucbfrjsZ:~# host semrushchina.cn\nsemrushchina.cn on aadress 220.170.186.192\nHost semrushchina.cn ei leitud: 2(SERVFAIL)<\/code><\/pre>\n<p><\/p>\n<p>Cloudflare'i NS-serverite otsese p\u00e4rimise korral selliseid vigu ei esine:<\/p>\n<p><\/p>\n<pre><code class=\"bash\">root@iZwz97n2wgbp61qucbfrjsZ:~# for i in `seq 1 2`; do host semrushchina.cn ray.ns.cloudflare.com.; done\nKasutame domeeni serverit:\nNimi: ray.ns.cloudflare.com.\nAadress: 173.245.59.138#53\nAliasid:\n\nsemrushchina.cn omab aadressi 220.170.186.192\nsemrushchina.cn omab aadressi 220.170.186.192\nKasutame domeeni serverit:\nNimi: ray.ns.cloudflare.com.\nAadress: 173.245.59.138#53\nAliasid:\n\nsemrushchina.cn omab aadressi 220.170.186.192\nsemrushchina.cn omab aadressi 220.170.186.192<\/code><\/pre>\n<p><\/p>\n<p>Seega on probleem \"kohalikus\" DNS-serveris v\u00f5i teenusepakkuja serveris.<br \/>\nEdasiuurimine n\u00e4itas, et <em>SERVFAIL<\/em> saame resolverilt <em>AAAA<\/em>-kirjeid. <\/p>\n<p><\/p>\n<p>Tundub, et Cloudflare'i p\u00e4ringul <em>AAAA<\/em>-kirje, mida domeenis ei eksisteeri, Cloudflare vastas <em>A<\/em>-kirjega, mis on viga ja ei vasta RFC-le. Seet\u00f5ttu ei meeldinud see kohalikule resolverile (<em>x.x.x.x<\/em>), ja ta vastas <em>SERVFAIL<\/em>. Allolevas logis on see k\u00e4itumine selgelt n\u00e4htav:<\/p>\n<p><\/p>\n<pre><code class=\"bash\">root@iZwz97n2wgbp61qucbfrjsZ:~# dig -t AAAA semrushchina.cn @x.x.x.x\n\n; &lt;&gt; DiG 9.10.3-P4-Ubuntu &lt;&gt; -t AAAA semrushchina.cn @x.x.x.x\n;; global options: +cmd\n;; Got answer:\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: SERVFAIL, id: 55467\n;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1\n\n;; OPT PSEUDOSECTION:\n; EDNS: version: 0, flags:; udp: 4096\n;; QUESTION SECTION:\n;semrushchina.cn.               IN      AAAA\n\n;; Query time: 334 msec\n;; SERVER: x.x.x.x#53(x.x.x.x)\n;; WHEN: Tue Aug 14 23:38:50 CST 2018\n;; MSG SIZE  rcvd: 44\n\nroot@iZwz97n2wgbp61qucbfrjsZ:~# dig -t AAAA semrushchina.cn @dana.ns.cloudflare.com.\n\n; &lt;&gt; DiG 9.10.3-P4-Ubuntu &lt;&gt; -t AAAA semrushchina.cn @dana.ns.cloudflare.com.\n;; global options: +cmd\n;; Got answer:\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 63944\n;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1\n;; WARNING: recursion requested but not available\n\n;; OPT PSEUDOSECTION:\n; EDNS: version: 0, flags:; udp: 512\n;; QUESTION SECTION:\n;semrushchina.cn.               IN      AAAA\n\n;; ANSWER SECTION:\nsemrushchina.cn.        300     IN      A       220.170.186.192\n\n;; Query time: 185 msec\n;; SERVER: 173.245.58.105#53(173.245.58.105)\n;; WHEN: Tue Aug 14 23:43:03 CST 2018\n;; MSG SIZE  rcvd: 60\n<\/code><\/pre>\n<p><\/p>\n<p>Me saatsime Cloudflare'ile bug-aruande ja nad lahendasid selle m\u00f5ne aja p\u00e4rast. Selgus, et Hiinas puudub endiselt IPv6 tugi, seet\u00f5ttu ei saanut Cloudflare seal oma IPv6 aadressi p\u00e4ringutele vastuseks anda. <em>AAAA<\/em>-kirjed. L\u00f5puks lahendati asi nii, et Hiina jaoks hakkas Cloudflare vastama <em>NODATA<\/em> taolistele p\u00e4ringutele.<\/p>\n<p><\/p>\n<p>Nii, DNS vead Catchpointi testides on j\u00e4rsult v\u00e4henenud, kuid mitte t\u00e4ielikult. Aja\u00fclesanded ei ole samuti kadunud:<\/p>\n<p><\/p>\n<p>Ja me hakkasime otsima teist lahendust. <\/p>\n<p><\/p>\n<p>J\u00e4rgmises osas r\u00e4\u00e4gin, kuidas me testisime Hiina pilveteenuseid <strong>Alibaba Cloud<\/strong>, kuidas me suutisime Nginxi v\u00e4ikese &#171;maagia&#187; abil kiiresti luua PoC (Proof of Concept) lahendusi, kuidas me l\u00f5ime Multi-Cloud lahendusi, millest \u00fcks aitas oluliselt kiirendada teenust Hiinast.<\/p>\n<p><\/p>\n<p><strong>J\u00e4lgige meid!<\/strong><\/p>\n<p><\/p>\n<h3 id=\"sleduyuschie-chasti\">J\u00e4rgmised osad<\/h3>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/semrush\/blog\/458840\/\">Osa 2<\/a><\/noindex><\/p>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/semrush\/blog\/458602\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0441\u0435\u043c \u043f\u0440\u0438\u0432\u0435\u0442! \u041d\u0430 \u0441\u0432\u044f\u0437\u0438 \u041d\u0438\u043a\u0438\u0442\u0430 \u2014 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0439 \u0438\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 S\u0415Mrush. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u044f \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u0432\u0430\u043c \u043e \u0442\u043e\u043c, \u043a\u0430\u043a \u043f\u0435\u0440\u0435\u0434 \u043d\u0430\u043c\u0438 \u0432\u0441\u0442\u0430\u043b\u0430 \u0437\u0430\u0434\u0430\u0447\u0430 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0442\u044c \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u043d\u0430\u0448\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0438\u0441\u0430 semrush.com \u0432 \u041a\u0438\u0442\u0430\u0435, \u0438 \u0441 \u043a\u0430\u043a\u0438\u043c\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u043c\u044b \u0441\u0442\u043e\u043b\u043a\u043d\u0443\u043b\u0438\u0441\u044c \u0432 \u0445\u043e\u0434\u0435 \u0435\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f (\u0443\u0447\u0438\u0442\u044b\u0432\u0430\u044f \u043c\u0435\u0441\u0442\u043e\u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043d\u0430\u0448\u0435\u0433\u043e \u0434\u0430\u0442\u0430-\u0446\u0435\u043d\u0442\u0440\u0430 \u043d\u0430 \u0432\u043e\u0441\u0442\u043e\u0447\u043d\u043e\u043c \u043f\u043e\u0431\u0435\u0440\u0435\u0436\u044c\u0435 \u0421\u0428\u0410). \u042d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u0431\u043e\u043b\u044c\u0448\u0430\u044f \u0438\u0441\u0442\u043e\u0440\u0438\u044f, \u0440\u0430\u0437\u0431\u0438\u0442\u0430\u044f \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-35939","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u0441\u0435\u043c \u043f\u0440\u0438\u0432\u0435\u0442! 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