{"id":4878,"date":"2026-02-09T16:16:04","date_gmt":"2026-02-09T13:16:04","guid":{"rendered":"https:\/\/www.dchost.com\/blog\/dns-performansini-olcmek-ve-iyilestirmek-anycast-coklu-dns-saglayici-ve-health-check-mimarisi\/"},"modified":"2026-02-09T16:16:04","modified_gmt":"2026-02-09T13:16:04","slug":"dns-performansini-olcmek-ve-iyilestirmek-anycast-coklu-dns-saglayici-ve-health-check-mimarisi","status":"publish","type":"post","link":"https:\/\/www.dchost.com\/blog\/dns-performansini-olcmek-ve-iyilestirmek-anycast-coklu-dns-saglayici-ve-health-check-mimarisi\/","title":{"rendered":"DNS Performans\u0131n\u0131 \u00d6l\u00e7mek ve \u0130yile\u015ftirmek: Anycast, \u00c7oklu DNS Sa\u011flay\u0131c\u0131 ve Health Check Mimarisi"},"content":{"rendered":"<div class=\"dchost-blog-content-wrapper\"><div id=\"toc_container\" class=\"toc_transparent no_bullets\"><p class=\"toc_title\">\u0130&ccedil;indekiler<\/p><ul class=\"toc_list\"><li><a href=\"#DNS_Performansini_Neden_Ciddiye_Almalisiniz\"><span class=\"toc_number toc_depth_1\">1<\/span> DNS Performans\u0131n\u0131 Neden Ciddiye Almal\u0131s\u0131n\u0131z?<\/a><\/li><li><a href=\"#DNS_Performansini_Olcerken_Hangi_Metriklere_Bakmalisiniz\"><span class=\"toc_number toc_depth_1\">2<\/span> DNS Performans\u0131n\u0131 \u00d6l\u00e7erken Hangi Metriklere Bakmal\u0131s\u0131n\u0131z?<\/a><ul><li><a href=\"#Ilk_Adim_Baz_Olcum_Baseline_Olusturmak\"><span class=\"toc_number toc_depth_2\">2.1<\/span> \u0130lk Ad\u0131m: Baz \u00d6l\u00e7\u00fcm (Baseline) Olu\u015fturmak<\/a><\/li><\/ul><\/li><li><a href=\"#DNS_Performansini_Test_Edebileceginiz_Pratik_Araclar\"><span class=\"toc_number toc_depth_1\">3<\/span> DNS Performans\u0131n\u0131 Test Edebilece\u011finiz Pratik Ara\u00e7lar<\/a><ul><li><a href=\"#Komut_Satiri_Araclari_dig_kdig_drill\"><span class=\"toc_number toc_depth_2\">3.1<\/span> Komut Sat\u0131r\u0131 Ara\u00e7lar\u0131: dig, kdig, drill<\/a><\/li><li><a href=\"#Bolgesel_Testler_ve_RIPE_Atlas_Benzeri_Olcumler\"><span class=\"toc_number toc_depth_2\">3.2<\/span> B\u00f6lgesel Testler ve RIPE Atlas Benzeri \u00d6l\u00e7\u00fcmler<\/a><\/li><li><a href=\"#Surekli_Izleme_Bir_Kerelik_Test_Yeterli_Degil\"><span class=\"toc_number toc_depth_2\">3.3<\/span> S\u00fcrekli \u0130zleme: Bir Kerelik Test Yeterli De\u011fil<\/a><\/li><\/ul><\/li><li><a href=\"#Anycast_DNS_ile_Gecikmeyi_Azaltmak_ve_Dayanikliligi_Artirmak\"><span class=\"toc_number toc_depth_1\">4<\/span> Anycast DNS ile Gecikmeyi Azaltmak ve Dayan\u0131kl\u0131l\u0131\u011f\u0131 Art\u0131rmak<\/a><ul><li><a href=\"#Anycast_DNSin_Somut_Avantajlari\"><span class=\"toc_number toc_depth_2\">4.1<\/span> Anycast DNS\u2019in Somut Avantajlar\u0131<\/a><\/li><li><a href=\"#Anycast_Kullanirken_Dikkat_Edilmesi_Gerekenler\"><span class=\"toc_number toc_depth_2\">4.2<\/span> Anycast Kullan\u0131rken Dikkat Edilmesi Gerekenler<\/a><\/li><\/ul><\/li><li><a href=\"#Coklu_DNS_Saglayici_Mimarisi_Vendor_Lock-ine_Karsi_Sigorta\"><span class=\"toc_number toc_depth_1\">5<\/span> \u00c7oklu DNS Sa\u011flay\u0131c\u0131 Mimarisi: Vendor Lock-in\u2019e Kar\u015f\u0131 Sigorta<\/a><ul><li><a href=\"#Coklu_Saglayici_DNS_Nedir\"><span class=\"toc_number toc_depth_2\">5.1<\/span> \u00c7oklu Sa\u011flay\u0131c\u0131 DNS Nedir?<\/a><\/li><li><a href=\"#AktifAktif_ve_AktifPasif_Modeller\"><span class=\"toc_number toc_depth_2\">5.2<\/span> Aktif\/Aktif ve Aktif\/Pasif Modeller<\/a><\/li><li><a href=\"#Zone_Yonetimi_ve_Otomasyon_octoDNS_vb\"><span class=\"toc_number toc_depth_2\">5.3<\/span> Zone Y\u00f6netimi ve Otomasyon (octoDNS vb.)<\/a><\/li><li><a href=\"#DNSSEC_CAA_ve_Diger_Gelismis_Kayitlar\"><span class=\"toc_number toc_depth_2\">5.4<\/span> DNSSEC, CAA ve Di\u011fer Geli\u015fmi\u015f Kay\u0131tlar<\/a><\/li><\/ul><\/li><li><a href=\"#Health_Check_ve_DNS_Tabanli_Otomatik_Failover_Mimarisi\"><span class=\"toc_number toc_depth_1\">6<\/span> Health Check ve DNS Tabanl\u0131 Otomatik Failover Mimarisi<\/a><ul><li><a href=\"#Health_Check_Nedir_Ne_Olcmelidir\"><span class=\"toc_number toc_depth_2\">6.1<\/span> Health Check Nedir, Ne \u00d6l\u00e7melidir?<\/a><\/li><li><a href=\"#DNS_Failoverin_Temel_Prensipleri\"><span class=\"toc_number toc_depth_2\">6.2<\/span> DNS Failover\u2019\u0131n Temel Prensipleri<\/a><\/li><li><a href=\"#Anycast_Health_Check_Coklu_Saglayici_Uc_Katmanli_Dayaniklilik\"><span class=\"toc_number toc_depth_2\">6.3<\/span> Anycast + Health Check + \u00c7oklu Sa\u011flay\u0131c\u0131: \u00dc\u00e7 Katmanl\u0131 Dayan\u0131kl\u0131l\u0131k<\/a><\/li><\/ul><\/li><li><a href=\"#Kucuk_ve_Orta_Olcekli_Projeler_Icin_Ornek_Mimari\"><span class=\"toc_number toc_depth_1\">7<\/span> K\u00fc\u00e7\u00fck ve Orta \u00d6l\u00e7ekli Projeler \u0130\u00e7in \u00d6rnek Mimari<\/a><ul><li><a href=\"#Asama_1_Mevcut_DNSinizi_Olcun_ve_TTLleri_Iyilestirin\"><span class=\"toc_number toc_depth_2\">7.1<\/span> A\u015fama 1: Mevcut DNS\u2019inizi \u00d6l\u00e7\u00fcn ve TTL\u2019leri \u0130yile\u015ftirin<\/a><\/li><li><a href=\"#Asama_2_Anycast_Destekli_DNSe_Gecis\"><span class=\"toc_number toc_depth_2\">7.2<\/span> A\u015fama 2: Anycast Destekli DNS\u2019e Ge\u00e7i\u015f<\/a><\/li><li><a href=\"#Asama_3_Health_Check_ve_Basit_Failover\"><span class=\"toc_number toc_depth_2\">7.3<\/span> A\u015fama 3: Health Check ve Basit Failover<\/a><\/li><li><a href=\"#Asama_4_Coklu_Saglayici_DNS_ile_Son_Katmani_Eklemek\"><span class=\"toc_number toc_depth_2\">7.4<\/span> A\u015fama 4: \u00c7oklu Sa\u011flay\u0131c\u0131 DNS ile Son Katman\u0131 Eklemek<\/a><\/li><\/ul><\/li><li><a href=\"#DCHost_Perspektifinden_Uygulanabilir_Yol_Haritasi_306090_Gun\"><span class=\"toc_number toc_depth_1\">8<\/span> DCHost Perspektifinden Uygulanabilir Yol Haritas\u0131 (30\u201360\u201390 G\u00fcn)<\/a><ul><li><a href=\"#Ilk_30_Gun_Olcum_Envanter_ve_Hizli_Kazanimlar\"><span class=\"toc_number toc_depth_2\">8.1<\/span> \u0130lk 30 G\u00fcn: \u00d6l\u00e7\u00fcm, Envanter ve H\u0131zl\u0131 Kazan\u0131mlar<\/a><\/li><li><a href=\"#60_Gun_Icinde_Anycast_ve_Health_Check_Pilotlari\"><span class=\"toc_number toc_depth_2\">8.2<\/span> 60 G\u00fcn \u0130\u00e7inde: Anycast ve Health Check Pilotlar\u0131<\/a><\/li><li><a href=\"#90_Gun_Icinde_Coklu_Saglayiciya_Hazirlik_ve_Otomasyon\"><span class=\"toc_number toc_depth_2\">8.3<\/span> 90 G\u00fcn \u0130\u00e7inde: \u00c7oklu Sa\u011flay\u0131c\u0131ya Haz\u0131rl\u0131k ve Otomasyon<\/a><\/li><\/ul><\/li><li><a href=\"#Ozet_ve_Sonuc_DNSi_Artik_Altyapinin_Merkezine_Cekme_Zamani\"><span class=\"toc_number toc_depth_1\">9<\/span> \u00d6zet ve Sonu\u00e7: DNS\u2019i Art\u0131k Altyap\u0131n\u0131n Merkezine \u00c7ekme Zaman\u0131<\/a><\/li><\/ul><\/div>\n<h2><span id=\"DNS_Performansini_Neden_Ciddiye_Almalisiniz\">DNS Performans\u0131n\u0131 Neden Ciddiye Almal\u0131s\u0131n\u0131z?<\/span><\/h2>\n<p>Web siteniz veya API\u2019niz ne kadar iyi optimize edilmi\u015f olursa olsun, ziyaret\u00e7inin taray\u0131c\u0131s\u0131n\u0131n ilk yapt\u0131\u011f\u0131 \u015fey her zaman DNS sorgusudur. Sunucu taraf\u0131nda saniyeler kazand\u0131ran optimizasyonlar yap\u0131p, DNS taraf\u0131nda onlarca milisaniyeyi \u00e7\u00f6pe atmak \u00e7ok s\u0131k g\u00f6rd\u00fc\u011f\u00fcm\u00fcz bir durum. DCHost ekibi olarak kapasite planlama ve mimari tasar\u0131m toplant\u0131lar\u0131nda art\u0131k DNS\u2019i, TTFB ve veritaban\u0131 performans\u0131 kadar kritik bir girdi olarak ele al\u0131yoruz. \u00c7\u00fcnk\u00fc \u00f6zellikle \u00e7ok b\u00f6lgeli trafik alan, e\u2011ticaret yapan veya SLA\u2019si y\u00fcksek projelerde DNS taraf\u0131ndaki her k\u00fc\u00e7\u00fck iyile\u015ftirme, ger\u00e7ek para ve itibar olarak geri d\u00f6n\u00fcyor.<\/p>\n<p>Bu yaz\u0131da, DNS performans\u0131n\u0131 nas\u0131l do\u011fru \u00f6l\u00e7ece\u011finizi, ortaya \u00e7\u0131kan veriyi nas\u0131l okuyaca\u011f\u0131n\u0131z\u0131 ve ard\u0131ndan Anycast, \u00e7oklu DNS sa\u011flay\u0131c\u0131 ve health check tabanl\u0131 otomatik failover mimarileriyle bu performans\u0131 nas\u0131l seviyeye atlayaca\u011f\u0131n\u0131z\u0131 ad\u0131m ad\u0131m anlataca\u011f\u0131z. Ama\u00e7; teorik bir sunum de\u011fil, do\u011frudan uygulanabilir bir yol haritas\u0131 vermek. \u00c7o\u011fu \u00f6rne\u011fi DCHost altyap\u0131s\u0131nda ve m\u00fc\u015fterilerimizde g\u00f6rd\u00fc\u011f\u00fcm\u00fcz ger\u00e7ek senaryolardan yola \u00e7\u0131karak aktaraca\u011f\u0131z.<\/p>\n<h2><span id=\"DNS_Performansini_Olcerken_Hangi_Metriklere_Bakmalisiniz\">DNS Performans\u0131n\u0131 \u00d6l\u00e7erken Hangi Metriklere Bakmal\u0131s\u0131n\u0131z?<\/span><\/h2>\n<p>DNS performans\u0131n\u0131 konu\u015furken tek bir \u201csorgu s\u00fcresi\u201d metri\u011fine bakmak genellikle yan\u0131lt\u0131c\u0131d\u0131r. Sa\u011fl\u0131kl\u0131 bir analiz i\u00e7in en az\u0131ndan a\u015fa\u011f\u0131daki ba\u015fl\u0131klar\u0131 birlikte de\u011ferlendirmeniz gerekir:<\/p>\n<ul>\n<li><strong>\u00c7\u00f6z\u00fcmleme gecikmesi (query latency):<\/strong> Kullan\u0131c\u0131n\u0131n kulland\u0131\u011f\u0131 resolver\u2019dan authoritative nameserver\u2019\u0131n\u0131za gidi\u015f\u2011geli\u015f s\u00fcresi.<\/li>\n<li><strong>\u0130lk sorgu vs. cache\u2019den gelen sorgu:<\/strong> So\u011fuk (uncached) ve s\u0131cak (cached) sorgu s\u00fcrelerinin ayr\u0131\u015ft\u0131r\u0131lmas\u0131.<\/li>\n<li><strong>Hata oran\u0131:<\/strong> SERVFAIL, NXDOMAIN, REFUSED gibi hatalar\u0131n oran\u0131 ve da\u011f\u0131l\u0131m\u0131.<\/li>\n<li><strong>B\u00f6lgesel gecikme farklar\u0131:<\/strong> T\u00fcrkiye\u2019den, Avrupa\u2019dan, Amerika\u2019dan ve m\u00fcmk\u00fcnse Asya\u2019dan gelen sorgular\u0131n kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131.<\/li>\n<li><strong>TTL etkisi:<\/strong> \u00c7ok d\u00fc\u015f\u00fck veya \u00e7ok y\u00fcksek TTL de\u011ferlerinin cache davran\u0131\u015f\u0131na ger\u00e7ek etkisi.<\/li>\n<li><strong>Kararl\u0131l\u0131k (jitter):<\/strong> Ortalama de\u011ferler kadar, zaman i\u00e7indeki dalgalanmalar\u0131n da izlenmesi.<\/li>\n<\/ul>\n<p>TTL \u00f6zelinde daha \u00f6nce ayr\u0131nt\u0131l\u0131 bir rehber haz\u0131rlam\u0131\u015ft\u0131k. DNS taraf\u0131nda de\u011fi\u015fiklik yapmadan \u00f6nce ve sonra etkisini anlamak i\u00e7in <a href='https:\/\/www.dchost.com\/blog\/dns-ttl-degerlerini-dogru-ayarlamak-a-mx-cname-ve-txt-kayitlari-icin-stratejik-rehber\/'>DNS TTL de\u011ferlerini stratejik \u015fekilde ayarlama rehberimize<\/a> g\u00f6z atman\u0131z faydal\u0131 olacakt\u0131r.<\/p>\n<h3><span id=\"Ilk_Adim_Baz_Olcum_Baseline_Olusturmak\">\u0130lk Ad\u0131m: Baz \u00d6l\u00e7\u00fcm (Baseline) Olu\u015fturmak<\/span><\/h3>\n<p>Herhangi bir iyile\u015ftirmeye ba\u015flamadan \u00f6nce, mevcut durumunuzu en az 7\u201314 g\u00fcn boyunca \u00f6l\u00e7\u00fcp bir \u201cbaz de\u011fer\u201d \u00e7\u0131kar\u0131n. Sadece tek bir test arac\u0131n\u0131n ekran g\u00f6r\u00fcnt\u00fcs\u00fcyle karar vermek, bizi sahada \u00e7ok kez yanl\u0131\u015f y\u00f6nlendirdi. A\u015fa\u011f\u0131daki yakla\u015f\u0131m i\u015finizi kolayla\u015ft\u0131r\u0131r:<\/p>\n<ul>\n<li>Farkl\u0131 lokasyonlardan (en az T\u00fcrkiye, Avrupa, Amerika) DNS sorgu s\u00fcrelerini toplay\u0131n.<\/li>\n<li>G\u00fcn\u00fcn farkl\u0131 saatlerinde \u00f6l\u00e7\u00fcm al\u0131n; sadece ofis saatlerine bakmay\u0131n.<\/li>\n<li>Farkl\u0131 ISP\u2019ler \u00fczerinden (\u00f6rne\u011fin kurumsal ofis, ev interneti, mobil ba\u011flant\u0131) test yap\u0131n.<\/li>\n<li>Alan ad\u0131n\u0131z\u0131n <strong>A\/AAAA<\/strong>, <strong>MX<\/strong> ve kritik <strong>CNAME<\/strong> kay\u0131tlar\u0131 i\u00e7in \u00f6l\u00e7\u00fcm sonu\u00e7lar\u0131n\u0131 ayr\u0131 ayr\u0131 kaydedin.<\/li>\n<\/ul>\n<p>Bu baz de\u011fer, Anycast\u2019e ge\u00e7tikten veya \u00e7oklu DNS sa\u011flay\u0131c\u0131 yap\u0131s\u0131 kurduktan sonra toplad\u0131\u011f\u0131n\u0131z yeni metriklerle kar\u015f\u0131la\u015ft\u0131rma yapman\u0131z\u0131 sa\u011flayacak. DCHost\u2019ta mimari de\u011fi\u015fiklik projelerinde, bu baz\u2011\u00f6l\u00e7\u00fcm a\u015famas\u0131n\u0131 atlamay\u0131 neredeyse yasak kabul ediyoruz; aksi halde yap\u0131lan iyile\u015ftirmenin ger\u00e7ekten i\u015fe yaray\u0131p yaramad\u0131\u011f\u0131n\u0131 objektif olarak g\u00f6rmek imkans\u0131zla\u015f\u0131yor.<\/p>\n<h2><span id=\"DNS_Performansini_Test_Edebileceginiz_Pratik_Araclar\">DNS Performans\u0131n\u0131 Test Edebilece\u011finiz Pratik Ara\u00e7lar<\/span><\/h2>\n<p>\u00c7ok karma\u015f\u0131k SaaS\u2019lara girmeden \u00f6nce, terminal ve basit izleme ara\u00e7lar\u0131yla olduk\u00e7a iyi bir resim \u00e7\u0131karabilirsiniz.<\/p>\n<h3><span id=\"Komut_Satiri_Araclari_dig_kdig_drill\">Komut Sat\u0131r\u0131 Ara\u00e7lar\u0131: dig, kdig, drill<\/span><\/h3>\n<p>En temel ve g\u00fcvenilir \u00f6l\u00e7\u00fcm, do\u011frudan <strong>authoritative nameserver<\/strong>\u2019\u0131n\u0131zla konu\u015fan ara\u00e7larla yap\u0131l\u0131r:<\/p>\n<ul>\n<li><strong>dig example.com A<\/strong>: Varsay\u0131lan resolver \u00fczerinden genel bir sorgu s\u00fcresi verir.<\/li>\n<li><strong>dig @NS-SUNUCUNUZ example.com A<\/strong>: Do\u011frudan authoritative sunucuya giderek altyap\u0131n\u0131z\u0131n ger\u00e7ek gecikmesini g\u00f6r\u00fcrs\u00fcn\u00fcz.<\/li>\n<li><strong>+trace<\/strong> parametresi ile k\u00f6k sunucudan itibaren zinciri izleyebilir, hangi ad\u0131mda gecikme olu\u015ftu\u011funu g\u00f6rebilirsiniz.<\/li>\n<\/ul>\n<p>Benzer \u015fekilde <strong>kdig<\/strong> veya <strong>drill<\/strong> de detayl\u0131 zamanlama bilgileri verir. Buradaki ama\u00e7, resolver cache etkisini d\u0131\u015far\u0131da b\u0131rak\u0131p, DNS altyap\u0131n\u0131z\u0131n \u201cham\u201d performans\u0131n\u0131 g\u00f6rebilmek.<\/p>\n<h3><span id=\"Bolgesel_Testler_ve_RIPE_Atlas_Benzeri_Olcumler\">B\u00f6lgesel Testler ve RIPE Atlas Benzeri \u00d6l\u00e7\u00fcmler<\/span><\/h3>\n<p>E\u011fer projeniz farkl\u0131 \u00fclkelerden ciddi trafik al\u0131yorsa, tek noktadan \u00f6l\u00e7\u00fcm yapmak genellikle yetersiz kal\u0131r. Farkl\u0131 b\u00f6lgelerde \u00e7al\u0131\u015fan prob\u2019larla (\u00f6rne\u011fin RIPE Atlas benzeri a\u011flar \u00fczerinden) \u015fu sorulara yan\u0131t arars\u0131n\u0131z:<\/p>\n<ul>\n<li>T\u00fcrkiye\u2019de 15 ms olan sorgu s\u00fcresi, ABD\u2019den bak\u0131ld\u0131\u011f\u0131nda 120 ms\u2019ye mi \u00e7\u0131k\u0131yor?<\/li>\n<li>Avrupa\u2019daki belli bir ISP, authoritative DNS\u2019inize anl\u0131k rota problemleriyle mi ula\u015f\u0131yor?<\/li>\n<li>Anycast\u2019e ge\u00e7ti\u011finizde, en uzak b\u00f6lgedeki kullan\u0131c\u0131lar i\u00e7in gecikme ne kadar azal\u0131yor?<\/li>\n<\/ul>\n<p>Bu metrikler, sadece DNS mimarinizi de\u011fil, genel network stratejinizi de g\u00f6zden ge\u00e7irmenizi sa\u011flar. Sunucu ve network performans\u0131n\u0131 daha geni\u015f perspektifte ele almak isterseniz, <a href='https:\/\/www.dchost.com\/blog\/hosting-firmasi-secerken-teknik-karsilastirma-ttfb-network-ping-ve-gercek-benchmark\/'>TTFB, network ve ger\u00e7ek benchmark odakl\u0131 teknik kar\u015f\u0131la\u015ft\u0131rma rehberimize<\/a> de g\u00f6z atabilirsiniz.<\/p>\n<h3><span id=\"Surekli_Izleme_Bir_Kerelik_Test_Yeterli_Degil\">S\u00fcrekli \u0130zleme: Bir Kerelik Test Yeterli De\u011fil<\/span><\/h3>\n<p>DNS performans\u0131 sabit bir de\u011fer de\u011fildir; network dalgalanmalar\u0131, BGP de\u011fi\u015fiklikleri, DDoS ataklar\u0131 ve bak\u0131m \u00e7al\u0131\u015fmalar\u0131yla s\u00fcrekli oynar. Bu y\u00fczden:<\/p>\n<ul>\n<li>Birka\u00e7 dakikada bir \u00e7al\u0131\u015fan basit DNS sorgu health check\u2019leri kurun.<\/li>\n<li>Hem \u00e7\u00f6z\u00fcmleme s\u00fcresini hem de hata kodlar\u0131n\u0131 loglay\u0131n.<\/li>\n<li>\u201cSpikes\u201d (k\u0131sa s\u00fcreli s\u0131\u00e7ramalar) ile s\u00fcrekli yava\u015fl\u0131klar\u0131 grafikte ay\u0131rt edin.<\/li>\n<\/ul>\n<p>DCHost\u2019ta y\u00fcksek SLA hedefi olan m\u00fc\u015fteriler i\u00e7in, DNS gecikmesini de dahil eden merkezi izleme ve alarm senaryolar\u0131 kuruyoruz. Detayl\u0131 bir izleme mimarisi kurmak istiyorsan\u0131z, <a href='https:\/\/www.dchost.com\/blog\/merkezi-sunucu-izleme-ve-alarm-mimarisi\/'>merkezi izleme ve alarm mimarisi rehberimizde<\/a> benzer yakla\u015f\u0131mlar\u0131 sunucu taraf\u0131 i\u00e7in de anlatt\u0131k; benzer prensipler DNS i\u00e7in de ge\u00e7erli.<\/p>\n<h2><span id=\"Anycast_DNS_ile_Gecikmeyi_Azaltmak_ve_Dayanikliligi_Artirmak\">Anycast DNS ile Gecikmeyi Azaltmak ve Dayan\u0131kl\u0131l\u0131\u011f\u0131 Art\u0131rmak<\/span><\/h2>\n<p>Anycast DNS\u2019in \u00f6z\u00fcn\u00fc tek c\u00fcmlede \u015f\u00f6yle \u00f6zetleyebiliriz: <strong>Ayn\u0131 IP adresini d\u00fcnya genelinde birden fazla DNS sunucusuna yayar, kullan\u0131c\u0131n\u0131n en yak\u0131n sunucuya y\u00f6nlenmesini sa\u011flars\u0131n\u0131z.<\/strong><\/p>\n<p>Unicast mimaride, ns1.example.com i\u00e7in tek bir IP adresi ve tek bir fiziksel lokasyon vard\u0131r. Kullan\u0131c\u0131 nerede olursa olsun, t\u00fcm sorgular o noktaya gider. Anycast\u2019te ise ayn\u0131 IP adresi, \u00f6rne\u011fin \u0130stanbul, Frankfurt ve Amsterdam\u2019daki DNS sunucular\u0131n\u0131zda e\u015f zamanl\u0131 olarak anons edilir; BGP y\u00f6nlendirme protokol\u00fc trafik yolunu otomatik olarak en \u201cyak\u0131n\u201d olana \u00e7eker.<\/p>\n<h3><span id=\"Anycast_DNSin_Somut_Avantajlari\">Anycast DNS\u2019in Somut Avantajlar\u0131<\/span><\/h3>\n<ul>\n<li><strong>Daha d\u00fc\u015f\u00fck gecikme:<\/strong> Kullan\u0131c\u0131lar\u0131n b\u00fcy\u00fck b\u00f6l\u00fcm\u00fc co\u011frafi olarak en yak\u0131ndaki POP\u2019a (Point of Presence) d\u00fc\u015fer.<\/li>\n<li><strong>Daha y\u00fcksek dayan\u0131kl\u0131l\u0131k:<\/strong> Bir POP tamamen devre d\u0131\u015f\u0131 kalsa bile, ayn\u0131 IP\u2019yi anons eden di\u011fer POP\u2019lar sorgular\u0131 cevaplamaya devam eder.<\/li>\n<li><strong>DDoS da\u011f\u0131t\u0131m\u0131:<\/strong> Sald\u0131r\u0131 trafi\u011fi tek noktaya y\u0131\u011f\u0131lmak yerine, birden fazla POP\u2019a da\u011f\u0131l\u0131r; absorbe etmesi daha kolay olur.<\/li>\n<li><strong>Basit konfig\u00fcrasyon:<\/strong> Uygulamalar\u0131n\u0131z taraf\u0131nda tek bir nameserver IP\u2019si kullan\u0131rs\u0131n\u0131z; Anycast karma\u015f\u0131kl\u0131\u011f\u0131 tamamen a\u011f katman\u0131nda kal\u0131r.<\/li>\n<\/ul>\n<p>DCHost taraf\u0131nda kurumsal DNS altyap\u0131m\u0131z\u0131 tasarlarken, T\u00fcrkiye ve Avrupa\u2019daki ziyaret\u00e7iler i\u00e7in gecikmeyi minimize edecek \u015fekilde Anycast destekli nameserver\u2019lar kullan\u0131yoruz. B\u00f6ylece ayn\u0131 DNS IP\u2019si, farkl\u0131 veri merkezlerimizde \u00e7al\u0131\u015fan redundant sunucular taraf\u0131ndan cevaplan\u0131yor.<\/p>\n<h3><span id=\"Anycast_Kullanirken_Dikkat_Edilmesi_Gerekenler\">Anycast Kullan\u0131rken Dikkat Edilmesi Gerekenler<\/span><\/h3>\n<p>Anycast her derde deva de\u011fil; do\u011fru planlanmazsa yeni problemler \u00fcretebilir:<\/p>\n<ul>\n<li><strong>BGP ve network uzmanl\u0131\u011f\u0131:<\/strong> Anycast, BGP y\u00f6nlendirmesine dayan\u0131r. Yanl\u0131\u015f anonslar, trafik d\u00f6ng\u00fcleri veya beklenmedik route\u2019lar ciddi sorun \u00e7\u0131karabilir.<\/li>\n<li><strong>Monitoring karma\u015f\u0131kl\u0131\u011f\u0131:<\/strong> Her POP\u2019u ayr\u0131 ayr\u0131 izleyip, sorun ya\u015fayan POP\u2019u h\u0131zla devre d\u0131\u015f\u0131 b\u0131rakacak otomasyon (veya network operasyon s\u00fcreci) kurman\u0131z gerekir.<\/li>\n<li><strong>Veri tutarl\u0131l\u0131\u011f\u0131:<\/strong> Anycast DNS sunucular\u0131n\u0131z\u0131n tamam\u0131nda ayn\u0131 zone verisinin anl\u0131k olarak senkronize oldu\u011fundan emin olmal\u0131s\u0131n\u0131z.<\/li>\n<\/ul>\n<p>Bu noktada, <a href='https:\/\/www.dchost.com\/blog\/hic-kesilmeden-yayinda-kalmak-mumkun-mu-anycast-dns-ve-otomatik-failover-ile-nasil-saglanir\/'>Anycast DNS ve otomatik failover mimarisini detayland\u0131rd\u0131\u011f\u0131m\u0131z yaz\u0131ya<\/a> g\u00f6z atman\u0131z, konseptleri kafan\u0131zda oturtmak i\u00e7in olduk\u00e7a faydal\u0131 olacakt\u0131r.<\/p>\n<h2><span id=\"Coklu_DNS_Saglayici_Mimarisi_Vendor_Lock-ine_Karsi_Sigorta\">\u00c7oklu DNS Sa\u011flay\u0131c\u0131 Mimarisi: Vendor Lock-in\u2019e Kar\u015f\u0131 Sigorta<\/span><\/h2>\n<p>Tek bir DNS sa\u011flay\u0131c\u0131s\u0131na ba\u011fl\u0131 kalmak; k\u0131sa kesintiler, panel sorunlar\u0131 veya hukuki\/reg\u00fclasyon kaynakl\u0131 problemler ya\u015fand\u0131\u011f\u0131nda b\u00fcy\u00fck risk olu\u015fturur. DCHost olarak \u00f6zellikle kritik projelerde, <strong>\u00e7oklu DNS sa\u011flay\u0131c\u0131<\/strong> (multi\u2011provider DNS) modelini ciddi \u015fekilde \u00f6neriyoruz.<\/p>\n<h3><span id=\"Coklu_Saglayici_DNS_Nedir\">\u00c7oklu Sa\u011flay\u0131c\u0131 DNS Nedir?<\/span><\/h3>\n<p>Basit\u00e7e s\u00f6ylemek gerekirse, ayn\u0131 domain i\u00e7in birden fazla ba\u011f\u0131ms\u0131z DNS altyap\u0131s\u0131 \u00e7al\u0131\u015ft\u0131r\u0131rs\u0131n\u0131z. \u00d6rne\u011fin:<\/p>\n<ul>\n<li>ns1\/ns2 bir sa\u011flay\u0131c\u0131da,<\/li>\n<li>ns3\/ns4 farkl\u0131 bir sa\u011flay\u0131c\u0131da bulunur.<\/li>\n<\/ul>\n<p>Alan ad\u0131n\u0131z\u0131n <strong>NS kay\u0131tlar\u0131<\/strong> bu d\u00f6rt sunucuyu da g\u00f6sterir. Resolver\u2019lar rastgele veya performansa g\u00f6re bu sunuculardan birine istek g\u00f6nderir. Bir sa\u011flay\u0131c\u0131 tamamen devre d\u0131\u015f\u0131 kalsa bile, di\u011fer sa\u011flay\u0131c\u0131 sorgular\u0131 cevaplamaya devam eder.<\/p>\n<p>Bu yakla\u015f\u0131m, sadece performans de\u011fil, <strong>vendor lock\u2011in riskini azaltma<\/strong> a\u00e7\u0131s\u0131ndan da \u00e7ok de\u011ferlidir. Konuyu daha geni\u015f \u00e7er\u00e7evede ele ald\u0131\u011f\u0131m\u0131z <a href='https:\/\/www.dchost.com\/blog\/hosting-ve-domainde-vendor-lock-in-riskini-azaltmak\/'>hosting ve domain\u2019de vendor lock\u2011in riskini azaltma rehberimize<\/a> mutlaka g\u00f6z atman\u0131z\u0131 \u00f6neririz.<\/p>\n<h3><span id=\"AktifAktif_ve_AktifPasif_Modeller\">Aktif\/Aktif ve Aktif\/Pasif Modeller<\/span><\/h3>\n<p>\u00c7oklu DNS sa\u011flay\u0131c\u0131 kurarken iki ana model vard\u0131r:<\/p>\n<ul>\n<li><strong>Aktif\/Aktif:<\/strong> T\u00fcm sa\u011flay\u0131c\u0131larda ayn\u0131 anda sorgu cevaplan\u0131r. Avantaj\u0131, y\u00fck ve riskin da\u011f\u0131t\u0131lmas\u0131d\u0131r. Dezavantaj\u0131, zone senkronizasyonunun daha karma\u015f\u0131k hale gelmesidir.<\/li>\n<li><strong>Aktif\/Pasif:<\/strong> Bir sa\u011flay\u0131c\u0131 ana, di\u011feri sadece yedektir. Genelde NS kay\u0131tlar\u0131 a\u011f\u0131rl\u0131kland\u0131r\u0131larak (veya farkl\u0131 otomasyonlarla) trafi\u011fin \u00e7o\u011fu ana sa\u011flay\u0131c\u0131ya y\u00f6nlendirilir. Sorun an\u0131nda yedek devreye girer.<\/li>\n<\/ul>\n<p>DCHost olarak, orta ve b\u00fcy\u00fck projelerde genellikle aktif\/aktif yap\u0131y\u0131 tercih ediyoruz; b\u00f6ylece hem performans hem de dayan\u0131kl\u0131l\u0131k kazan\u0131l\u0131yor. Ancak daha basit senaryolarda aktif\/pasif model de gayet yeterli olabiliyor.<\/p>\n<h3><span id=\"Zone_Yonetimi_ve_Otomasyon_octoDNS_vb\">Zone Y\u00f6netimi ve Otomasyon (octoDNS vb.)<\/span><\/h3>\n<p>\u00c7oklu sa\u011flay\u0131c\u0131 yap\u0131s\u0131nda en kritik konu, <strong>DNS kay\u0131t senkronizasyonu<\/strong>dur. Farkl\u0131 panellerde elle de\u011fi\u015fiklik yapmak ka\u00e7\u0131n\u0131lmaz olarak hata ve tutars\u0131zl\u0131k \u00fcretir. Bu y\u00fczden konfig\u00fcrasyonu kod gibi ele almak \u00e7ok daha sa\u011fl\u0131kl\u0131:<\/p>\n<ul>\n<li>DNS kay\u0131tlar\u0131n\u0131z\u0131 bir YAML\/JSON repo i\u00e7inde tan\u0131mlars\u0131n\u0131z.<\/li>\n<li>CI\/CD pipeline\u2019\u0131, bu tan\u0131m\u0131 her sa\u011flay\u0131c\u0131n\u0131n API\u2019sine push eder.<\/li>\n<li>De\u011fi\u015fiklikler otomatik olarak t\u00fcm sa\u011flay\u0131c\u0131lara ayn\u0131 anda yay\u0131l\u0131r.<\/li>\n<\/ul>\n<p>Bu modele y\u00f6nelik kapsaml\u0131 bir rehberi, <a href='https:\/\/www.dchost.com\/blog\/coklu-saglayici-dns-nasil-kurulur-octodns-ile-zero%e2%80%91downtime-gecis-ve-dayaniklilik-rehberi\/'>\u00e7oklu sa\u011flay\u0131c\u0131 DNS ve octoDNS kullan\u0131m\u0131<\/a> \u00fczerine haz\u0131rlad\u0131\u011f\u0131m\u0131z yaz\u0131da bulabilirsiniz. Orada zero\u2011downtime ge\u00e7i\u015f ve dayan\u0131kl\u0131l\u0131k taraf\u0131n\u0131 ayr\u0131ca detayland\u0131rd\u0131k.<\/p>\n<h3><span id=\"DNSSEC_CAA_ve_Diger_Gelismis_Kayitlar\">DNSSEC, CAA ve Di\u011fer Geli\u015fmi\u015f Kay\u0131tlar<\/span><\/h3>\n<p>\u00c7oklu sa\u011flay\u0131c\u0131 mimarisinde unutulmamas\u0131 gereken iki hassas ba\u015fl\u0131k daha var:<\/p>\n<ul>\n<li><strong>DNSSEC:<\/strong> \u0130ki sa\u011flay\u0131c\u0131n\u0131n da DNSSEC deste\u011fi uyumlu olmal\u0131; KSK\/ZSK anahtar y\u00f6netimi ve DS kay\u0131t g\u00fcncellemeleri dikkatle tasarlanmal\u0131d\u0131r.<\/li>\n<li><strong>CAA kay\u0131tlar\u0131:<\/strong> Hangi sertifika otoritelerinin domain\u2019iniz i\u00e7in sertifika \u00fcretebilece\u011fini belirleyen CAA kay\u0131tlar\u0131, t\u00fcm sa\u011flay\u0131c\u0131lar\u0131n\u0131zda ayn\u0131 olmal\u0131d\u0131r. Aksi halde baz\u0131 istekler DNS \u00fczerinden farkl\u0131 cevaplar g\u00f6rebilir ve beklenmedik hatalar olu\u015fur.<\/li>\n<\/ul>\n<p>DCHost\u2019ta SSL otomasyonu yaparken, CAA kay\u0131tlar\u0131n\u0131 da s\u00fcrecin bir par\u00e7as\u0131 olarak ele al\u0131yor, \u00e7oklu DNS sa\u011flay\u0131c\u0131 senaryolar\u0131nda bu kay\u0131tlar\u0131n tutarl\u0131 kalmas\u0131n\u0131 \u00f6zellikle denetliyoruz.<\/p>\n<h2><span id=\"Health_Check_ve_DNS_Tabanli_Otomatik_Failover_Mimarisi\">Health Check ve DNS Tabanl\u0131 Otomatik Failover Mimarisi<\/span><\/h2>\n<p>DNS\u2019i sadece \u201cadres defteri\u201d gibi g\u00f6rmek art\u0131k g\u00fcncel bir bak\u0131\u015f a\u00e7\u0131s\u0131 de\u011fil. Do\u011fru kurgulanm\u0131\u015f bir health check ve otomatik failover mimarisiyle, DNS katman\u0131 aktif bir trafik y\u00f6neticisine d\u00f6n\u00fc\u015febilir.<\/p>\n<h3><span id=\"Health_Check_Nedir_Ne_Olcmelidir\">Health Check Nedir, Ne \u00d6l\u00e7melidir?<\/span><\/h3>\n<p>DNS health check\u2019leri basit\u00e7e \u015fu soruyu sorar: <strong>\u201cBu kay\u0131t \u00fczerinden i\u015faret etti\u011fim hedef ger\u00e7ekten sa\u011fl\u0131kl\u0131 m\u0131?\u201d<\/strong> Ama sadece ICMP ping veya TCP port a\u00e7\u0131k m\u0131 testiyle yetinmek genellikle yetersizdir. DCHost olarak a\u015fa\u011f\u0131daki katmanlarda health check kurgulamay\u0131 tercih ediyoruz:<\/p>\n<ul>\n<li><strong>L3\/L4:<\/strong> IP\u2019ye ping atmak, TCP portunun (80\/443 vb.) a\u00e7\u0131k oldu\u011funu do\u011frulamak.<\/li>\n<li><strong>L7:<\/strong> Belirli bir URL\u2019e HTTP(S) iste\u011fi at\u0131p, hem durum kodunu hem de cevap i\u00e7eri\u011fini kontrol etmek (\u00f6rne\u011fin &#8220;\/health&#8221; endpoint\u2019i).<\/li>\n<li><strong>Uygulama mant\u0131\u011f\u0131:<\/strong> \u00d6rne\u011fin e\u2011ticaret sitesinde sepet veya \u00f6deme ak\u0131\u015f\u0131na \u00f6zel sentetik testler yapmak.<\/li>\n<\/ul>\n<p>Bu health check sonu\u00e7lar\u0131na g\u00f6re DNS kay\u0131tlar\u0131n\u0131z dinamik olarak g\u00fcncellenebilir. Bir node \u00e7\u00f6kerse, o node\u2019a i\u015faret eden A\/AAAA kay\u0131tlar\u0131 devre d\u0131\u015f\u0131 kal\u0131r; trafi\u011finiz otomatik olarak ayakta kalan node\u2019lara akar.<\/p>\n<h3><span id=\"DNS_Failoverin_Temel_Prensipleri\">DNS Failover\u2019\u0131n Temel Prensipleri<\/span><\/h3>\n<p>DNS failover kurgularken \u015fu noktalar kritik \u00f6nem ta\u015f\u0131r:<\/p>\n<ul>\n<li><strong>TTL De\u011ferleri:<\/strong> \u00c7ok y\u00fcksek TTL, failover\u2019\u0131 yava\u015flat\u0131r; \u00e7ok d\u00fc\u015f\u00fck TTL, resolver ve authoritative y\u00fck\u00fcn\u00fc gereksiz yere art\u0131r\u0131r. Kritik kay\u0131tlar i\u00e7in orta seviyede (\u00f6rne\u011fin 30\u2013120 saniye) TTL\u2019ler genellikle iyi bir dengedir.<\/li>\n<li><strong>Health check s\u0131kl\u0131\u011f\u0131:<\/strong> \u00c7ok s\u0131k kontrol, gereksiz y\u00fck ve yanl\u0131\u015f pozitiflere; \u00e7ok seyrek kontrol, ge\u00e7 failover\u2019a neden olur. Tipik olarak 10\u201330 saniyelik aral\u0131klar iyi \u00e7al\u0131\u015f\u0131r.<\/li>\n<li><strong>Flapping \u00f6nleme:<\/strong> Bir node\u2019un k\u0131sa s\u00fcreli gidip gelmesinde hemen failover yapmamak i\u00e7in \u201cconsecutive failures\u201d ve \u201crecovery threshold\u201d mekanizmalar\u0131 kurun.<\/li>\n<\/ul>\n<p>TTL ve yay\u0131l\u0131m s\u00fcresi konusunu daha \u00f6nce detayl\u0131 ele ald\u0131\u011f\u0131m\u0131z <a href='https:\/\/www.dchost.com\/blog\/zero-downtime-tasima-icin-ttl-stratejileri-dns-yayilimini-gercekten-nasil-hizlandirirsin\/'>zero\u2011downtime ta\u015f\u0131ma ve TTL stratejileri rehberimiz<\/a>, DNS failover tasarlarken mutlaka okunmas\u0131 gereken tamamlay\u0131c\u0131 bir i\u00e7erik.<\/p>\n<h3><span id=\"Anycast_Health_Check_Coklu_Saglayici_Uc_Katmanli_Dayaniklilik\">Anycast + Health Check + \u00c7oklu Sa\u011flay\u0131c\u0131: \u00dc\u00e7 Katmanl\u0131 Dayan\u0131kl\u0131l\u0131k<\/span><\/h3>\n<p>Olgun bir DNS mimarisinde, bu \u00fc\u00e7 yakla\u015f\u0131m\u0131 birlikte g\u00f6rmeyi seviyoruz:<\/p>\n<ol>\n<li><strong>Anycast:<\/strong> Kullan\u0131c\u0131y\u0131 en yak\u0131n DNS POP\u2019una getirip gecikmeyi d\u00fc\u015f\u00fcr\u00fcr.<\/li>\n<li><strong>Health check tabanl\u0131 failover:<\/strong> Ayn\u0131 sa\u011flay\u0131c\u0131 i\u00e7indeki farkl\u0131 origin IP\u2019ler aras\u0131nda otomatik ge\u00e7i\u015f yapar.<\/li>\n<li><strong>\u00c7oklu DNS sa\u011flay\u0131c\u0131:<\/strong> Sa\u011flay\u0131c\u0131 taraf\u0131nda ya\u015fanacak geni\u015f \u00e7apl\u0131 kesintilere kar\u015f\u0131 sigorta g\u00f6revi g\u00f6r\u00fcr.<\/li>\n<\/ol>\n<p>B\u00f6yle bir kurgu sayesinde, tek bir veri merkezinin, tek bir sa\u011flay\u0131c\u0131n\u0131n veya tek bir DNS POP\u2019unun problemi, son kullan\u0131c\u0131 a\u00e7\u0131s\u0131ndan \u00e7o\u011fu zaman fark edilmeyen k\u0131sa dalgalanmalar olarak kal\u0131r. DCHost taraf\u0131nda y\u00fcksek SLA isteyen m\u00fc\u015fteriler i\u00e7in bu \u00fc\u00e7 katman\u0131 birlikte d\u00fc\u015f\u00fcnerek tasar\u0131m yap\u0131yoruz.<\/p>\n<h2><span id=\"Kucuk_ve_Orta_Olcekli_Projeler_Icin_Ornek_Mimari\">K\u00fc\u00e7\u00fck ve Orta \u00d6l\u00e7ekli Projeler \u0130\u00e7in \u00d6rnek Mimari<\/span><\/h2>\n<p>\u201cBunlar\u0131n hepsi g\u00fczel ama benim sitem orta \u00f6l\u00e7ekli, ger\u00e7ekten hepsine ihtiyac\u0131m var m\u0131?\u201d sorusunu \u00e7ok duyuyoruz. Cevap: Her \u015feyi bir gecede kurmak zorunda de\u011filsiniz; kademeli gitmek hem daha g\u00fcvenli hem de b\u00fct\u00e7e dostu.<\/p>\n<h3><span id=\"Asama_1_Mevcut_DNSinizi_Olcun_ve_TTLleri_Iyilestirin\">A\u015fama 1: Mevcut DNS\u2019inizi \u00d6l\u00e7\u00fcn ve TTL\u2019leri \u0130yile\u015ftirin<\/span><\/h3>\n<ul>\n<li>\u00d6nce mevcut DNS sa\u011flay\u0131c\u0131n\u0131zla detayl\u0131 bir performans \u00f6l\u00e7\u00fcm\u00fc yap\u0131n.<\/li>\n<li>Kritik A\/AAAA, MX ve API alt alan adlar\u0131 i\u00e7in TTL\u2019leri g\u00f6zden ge\u00e7irin.<\/li>\n<li>Yak\u0131n gelecekte DNS tabanl\u0131 ge\u00e7i\u015f veya failover planl\u0131yorsan\u0131z, bu kay\u0131tlar\u0131n TTL de\u011ferlerini kademeli olarak d\u00fc\u015f\u00fcr\u00fcn.<\/li>\n<\/ul>\n<p>Bu a\u015famada, <a href='https:\/\/www.dchost.com\/blog\/dns-yayilim-suresi-nedir-neden-24-saat-surer-ve-nasil-hizlandirilir\/'>DNS yay\u0131l\u0131m s\u00fcresi nas\u0131l h\u0131zland\u0131r\u0131l\u0131r<\/a> yaz\u0131m\u0131zda anlatt\u0131\u011f\u0131m\u0131z pratikler de i\u015finize yarayacakt\u0131r.<\/p>\n<h3><span id=\"Asama_2_Anycast_Destekli_DNSe_Gecis\">A\u015fama 2: Anycast Destekli DNS\u2019e Ge\u00e7i\u015f<\/span><\/h3>\n<p>\u0130kinci a\u015famada hedef, tek sa\u011flay\u0131c\u0131 da olsa Anycast destekli, b\u00f6lgesel POP\u2019lar\u0131 olan bir DNS mimarisine ge\u00e7mek. Bu sayede:<\/p>\n<ul>\n<li>T\u00fcrkiye ve yak\u0131n b\u00f6lgelerde sorgu s\u00fcreleriniz d\u00fc\u015fer.<\/li>\n<li>Tek veri merkezi ar\u0131zas\u0131, DNS taraf\u0131nda tam kesinti anlam\u0131na gelmez.<\/li>\n<\/ul>\n<p>DCHost altyap\u0131s\u0131nda, T\u00fcrkiye odakl\u0131 ama ayn\u0131 zamanda Avrupa\u2019dan da trafik alan projeler i\u00e7in, Anycast DNS ile gecikmeyi ciddi oranda d\u00fc\u015f\u00fcrd\u00fc\u011f\u00fcm\u00fcz \u00e7ok say\u0131da senaryo g\u00f6rd\u00fck. \u00d6zellikle mobil trafik oran\u0131 y\u00fcksek sitelerde etkisi net \u015fekilde hissediliyor.<\/p>\n<h3><span id=\"Asama_3_Health_Check_ve_Basit_Failover\">A\u015fama 3: Health Check ve Basit Failover<\/span><\/h3>\n<p>Bu a\u015famada hala tek DNS sa\u011flay\u0131c\u0131 kullan\u0131yor olabilirsiniz; sorun de\u011fil. Ancak DNS sa\u011flay\u0131c\u0131n\u0131z\u0131n sundu\u011fu <strong>health check + failover<\/strong> \u00f6zellikleri varsa, en az\u0131ndan iki origin IP aras\u0131nda ge\u00e7i\u015f yapacak basit bir kurgu kurabilirsiniz:<\/p>\n<ul>\n<li>Birincil web sunucunuz DCHost \u00fczerinde bir <a href=\"https:\/\/www.dchost.com\/tr\/vps\">VPS<\/a> veya <a href=\"https:\/\/www.dchost.com\/tr\/fiziksel-sunucu\">dedicated sunucu<\/a> olsun.<\/li>\n<li>\u0130kincil sunucuyu daha hafif kaynaklarla, sadece acil durumlarda devreye girecek \u015fekilde planlay\u0131n.<\/li>\n<li>DNS kay\u0131tlar\u0131n\u0131z\u0131, health check ba\u015far\u0131s\u0131z oldu\u011funda otomatik olarak ikincil IP\u2019ye i\u015faret edecek \u015fekilde yap\u0131land\u0131r\u0131n.<\/li>\n<\/ul>\n<p>Burada TTL de\u011ferlerini, failover h\u0131z\u0131n\u0131 ve veri senkronizasyonunu dikkatle test etmeniz \u015fart. Biz DCHost taraf\u0131nda bu ge\u00e7i\u015fleri planlarken staging ortamlar\u0131nda defalarca prova yapmadan canl\u0131ya alm\u0131yoruz.<\/p>\n<h3><span id=\"Asama_4_Coklu_Saglayici_DNS_ile_Son_Katmani_Eklemek\">A\u015fama 4: \u00c7oklu Sa\u011flay\u0131c\u0131 DNS ile Son Katman\u0131 Eklemek<\/span><\/h3>\n<p>Son a\u015famada, Anycast + health check kurgunuzu <strong>ikinci bir DNS sa\u011flay\u0131c\u0131 ile \u00e7o\u011falt\u0131rs\u0131n\u0131z<\/strong>. Bunu yaparken:<\/p>\n<ul>\n<li>T\u00fcm DNS kay\u0131tlar\u0131n\u0131z\u0131 kod olarak y\u00f6neten bir repo olu\u015fturun (\u00f6rne\u011fin octoDNS).<\/li>\n<li>CI\/CD \u00fczerinden her iki sa\u011flay\u0131c\u0131n\u0131n API\u2019lerini besleyin.<\/li>\n<li>Her iki sa\u011flay\u0131c\u0131da da ayn\u0131 health check ve failover mant\u0131\u011f\u0131n\u0131 in\u015fa edin.<\/li>\n<\/ul>\n<p>B\u00f6ylece DNS taraf\u0131nda olgun, test edilmi\u015f ve otomasyona dayal\u0131 bir mimari elde etmi\u015f olursunuz. \u00c7oklu sa\u011flay\u0131c\u0131 taraf\u0131ndaki detaylar\u0131 tekrar hat\u0131rlamak i\u00e7in, yukar\u0131da bahsetti\u011fimiz <a href='https:\/\/www.dchost.com\/blog\/coklu-saglayici-dns-nasil-kurulur-octodns-ile-zero%e2%80%91downtime-gecis-ve-dayaniklilik-rehberi\/'>octoDNS ile \u00e7oklu sa\u011flay\u0131c\u0131 DNS rehberine<\/a> geri d\u00f6nebilirsiniz.<\/p>\n<h2><span id=\"DCHost_Perspektifinden_Uygulanabilir_Yol_Haritasi_306090_Gun\">DCHost Perspektifinden Uygulanabilir Yol Haritas\u0131 (30\u201360\u201390 G\u00fcn)<\/span><\/h2>\n<p>Teoride her \u015fey g\u00fczel; peki pratikte bu d\u00f6n\u00fc\u015f\u00fcm\u00fc nas\u0131l zamana yayabilirsiniz? DCHost\u2019ta m\u00fc\u015fterilerimizle \u00e7al\u0131\u015f\u0131rken s\u0131k kulland\u0131\u011f\u0131m\u0131z 30\u201360\u201390 g\u00fcnl\u00fck bir \u00e7er\u00e7eveyi \u00f6zetleyelim.<\/p>\n<h3><span id=\"Ilk_30_Gun_Olcum_Envanter_ve_Hizli_Kazanimlar\">\u0130lk 30 G\u00fcn: \u00d6l\u00e7\u00fcm, Envanter ve H\u0131zl\u0131 Kazan\u0131mlar<\/span><\/h3>\n<ul>\n<li>Mevcut DNS sa\u011flay\u0131c\u0131n\u0131z, NS kay\u0131tlar\u0131n\u0131z ve TTL de\u011ferlerinizin envanterini \u00e7\u0131kar\u0131yoruz.<\/li>\n<li>Farkl\u0131 b\u00f6lgelerden DNS sorgu gecikmesi ve hata oranlar\u0131n\u0131 \u00f6l\u00e7\u00fcp baz de\u011fer olu\u015fturuyoruz.<\/li>\n<li>Kritik kay\u0131tlar i\u00e7in \u00e7ok y\u00fcksek TTL\u2019leri a\u015fa\u011f\u0131 \u00e7ekip, h\u0131zl\u0131 kazan\u0131m sa\u011flayacak d\u00fczenlemeler yap\u0131yoruz.<\/li>\n<\/ul>\n<h3><span id=\"60_Gun_Icinde_Anycast_ve_Health_Check_Pilotlari\">60 G\u00fcn \u0130\u00e7inde: Anycast ve Health Check Pilotlar\u0131<\/span><\/h3>\n<ul>\n<li>Anycast destekli DNS\u2019e ge\u00e7i\u015f veya mevcut Anycast altyap\u0131n\u0131z\u0131n performans testini planl\u0131yoruz.<\/li>\n<li>Se\u00e7ili bir alt alan ad\u0131nda (\u00f6rne\u011fin beta.example.com) health check + failover pilotu kurguluyoruz.<\/li>\n<li>Bu pilot \u00fczerinden hem performans hem de kararl\u0131l\u0131k verisi toplay\u0131p optimizasyon yap\u0131yoruz.<\/li>\n<\/ul>\n<h3><span id=\"90_Gun_Icinde_Coklu_Saglayiciya_Hazirlik_ve_Otomasyon\">90 G\u00fcn \u0130\u00e7inde: \u00c7oklu Sa\u011flay\u0131c\u0131ya Haz\u0131rl\u0131k ve Otomasyon<\/span><\/h3>\n<ul>\n<li>DNS kay\u0131tlar\u0131n\u0131z\u0131 kod olarak y\u00f6netmek i\u00e7in depo ve pipeline tasarl\u0131yoruz.<\/li>\n<li>\u0130kinci bir DNS sa\u011flay\u0131c\u0131 i\u00e7in NS plan\u0131, zone senkronizasyonu ve failover senaryolar\u0131n\u0131 birlikte yaz\u0131yoruz.<\/li>\n<li>Canl\u0131 ge\u00e7i\u015fi, TTL stratejileriyle destekleyip zero\u2011downtime yakla\u015f\u0131m\u0131yla ger\u00e7ekle\u015ftiriyoruz.<\/li>\n<\/ul>\n<p>Bu s\u00fcrecin tamam\u0131nda as\u0131l hedef; karma\u015f\u0131k, insan hatas\u0131na a\u00e7\u0131k panel operasyonlar\u0131ndan uzakla\u015f\u0131p, test edilebilir ve geri al\u0131nabilir (rollback\u2019li) bir DNS mimarisi kurmak. Zaten <a href='https:\/\/www.dchost.com\/blog\/hosting-firmasi-degistirirken-dns-ve-domain-tasima-kontrol-listesi\/'>DNS ve domain ta\u015f\u0131ma kontrol listesi<\/a> yaz\u0131m\u0131zda da benzer bir yakla\u015f\u0131m\u0131 bar\u0131nd\u0131rma ge\u00e7i\u015fleri i\u00e7in anlatm\u0131\u015ft\u0131k; DNS performans\u0131 ve dayan\u0131kl\u0131l\u0131\u011f\u0131 da ayn\u0131 zihniyetle ele al\u0131nmal\u0131.<\/p>\n<h2><span id=\"Ozet_ve_Sonuc_DNSi_Artik_Altyapinin_Merkezine_Cekme_Zamani\">\u00d6zet ve Sonu\u00e7: DNS\u2019i Art\u0131k Altyap\u0131n\u0131n Merkezine \u00c7ekme Zaman\u0131<\/span><\/h2>\n<p>DNS, uzun y\u0131llar boyunca \u201cbir kez ayarlay\u0131p unuttu\u011fumuz\u201d bir bile\u015fen olarak g\u00f6r\u00fcld\u00fc. Ancak g\u00fcn\u00fcm\u00fcz\u00fcn \u00e7ok b\u00f6lgeli, y\u00fcksek trafik alan ve kesintiye tolerans\u0131 d\u00fc\u015f\u00fck projelerinde, DNS\u2019in performans ve dayan\u0131kl\u0131l\u0131k \u00fczerindeki etkisi do\u011frudan hissediliyor. DCHost\u2019ta sahada g\u00f6rd\u00fc\u011f\u00fcm\u00fcz tablo net: DNS taraf\u0131nda yap\u0131lan iyile\u015ftirmeler, \u00e7o\u011fu zaman uygulama optimizasyonlar\u0131ndan bile daha h\u0131zl\u0131 geri d\u00f6n\u00fc\u015f sa\u011fl\u0131yor.<\/p>\n<p>Bu yaz\u0131da DNS performans\u0131n\u0131 nas\u0131l \u00f6l\u00e7ece\u011finizi, Anycast ile gecikmeyi nas\u0131l azaltaca\u011f\u0131n\u0131z\u0131, \u00e7oklu DNS sa\u011flay\u0131c\u0131 ile vendor lock\u2011in ve altyap\u0131 risklerini nas\u0131l d\u00fc\u015f\u00fcrebilece\u011finizi ve health check tabanl\u0131 otomatik failover mimarisiyle ger\u00e7ek anlamda y\u00fcksek eri\u015filebilirlik elde edebilece\u011finizi anlatt\u0131k. \u015eimdi s\u0131rada, kendi alan adlar\u0131n\u0131z ve projeleriniz i\u00e7in bu ad\u0131mlar\u0131 planlamak var.<\/p>\n<p>E\u011fer DNS mimarinizi g\u00f6zden ge\u00e7irmek, Anycast veya \u00e7oklu sa\u011flay\u0131c\u0131ya ge\u00e7i\u015f plan\u0131 yapmak ya da health check tabanl\u0131 failover kurgusunu birlikte tasarlamak isterseniz, DCHost ekibi olarak buraday\u0131z. Mevcut domain, hosting, VPS, dedicated sunucu veya colocation altyap\u0131n\u0131z\u0131 bozmadan, kademeli ve test edilebilir bir yol haritas\u0131 \u00e7\u0131karal\u0131m; DNS\u2019i ger\u00e7ekten hak etti\u011fi yere, altyap\u0131n\u0131z\u0131n merkezine birlikte \u00e7ekelim.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>\u0130&ccedil;indekiler1 DNS Performans\u0131n\u0131 Neden Ciddiye Almal\u0131s\u0131n\u0131z?2 DNS Performans\u0131n\u0131 \u00d6l\u00e7erken Hangi Metriklere Bakmal\u0131s\u0131n\u0131z?2.1 \u0130lk Ad\u0131m: Baz \u00d6l\u00e7\u00fcm (Baseline) Olu\u015fturmak3 DNS Performans\u0131n\u0131 Test Edebilece\u011finiz Pratik Ara\u00e7lar3.1 Komut Sat\u0131r\u0131 Ara\u00e7lar\u0131: dig, kdig, drill3.2 B\u00f6lgesel Testler ve RIPE Atlas Benzeri \u00d6l\u00e7\u00fcmler3.3 S\u00fcrekli \u0130zleme: Bir Kerelik Test Yeterli De\u011fil4 Anycast DNS ile Gecikmeyi Azaltmak ve Dayan\u0131kl\u0131l\u0131\u011f\u0131 Art\u0131rmak4.1 Anycast DNS\u2019in Somut [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4879,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-4878","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-teknoloji"],"_links":{"self":[{"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/posts\/4878","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/comments?post=4878"}],"version-history":[{"count":0,"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/posts\/4878\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/media\/4879"}],"wp:attachment":[{"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/media?parent=4878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/categories?post=4878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/wp-json\/wp\/v2\/tags?post=4878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}