{"id":2357,"date":"2020-03-14T12:05:30","date_gmt":"2020-03-14T12:05:30","guid":{"rendered":"https:\/\/www.thc.ro\/blog\/?p=2357"},"modified":"2024-03-26T08:25:52","modified_gmt":"2024-03-26T08:25:52","slug":"propagarea-dns-ce-este-cum-functioneaza-si-cat-dureaza","status":"publish","type":"post","link":"https:\/\/www.thc.ro\/blog\/propagarea-dns-ce-este-cum-functioneaza-si-cat-dureaza\/","title":{"rendered":"Propagarea DNS &#8211; Ce este, cum func\u021bioneaz\u0103 \u0219i c\u00e2t dureaz\u0103?"},"content":{"rendered":"\n<p>Tocmai \u021bi-ai \u00eenregistrat noul nume de domeniu \u0219i ai lansat site-ul, dar c\u00e2nd introduci adresa URL \u00een browser pentru a-l verifica, realizezi c\u0103 site-ul t\u0103u nu este func\u021bional. Sau poate \u021bi-ai mutat de cur\u00e2nd site-ul la un alt <a href=\"http:\/\/thc.ro\">furnizor de g\u0103zduire web<\/a> \u0219i unii clien\u021bi se pl\u00e2ng c\u0103 nu \u00ee\u021bi pot accesa site-ul. Te \u00eentrebi probabil ce se \u00eent\u00e2mpl\u0103, ce a cauzat asta \u0219i \u00eencerci s\u0103 cau\u021bi o rezolvare rapid\u0103 la problema ta. De fapt, aceast\u0103 situa\u021bie este una normal\u0103 \u0219i se nume\u0219te <strong>propagare DNS.<\/strong><\/p>\n\n\n\n<p>Propagarea DNS este procesul de transfer al unui domeniu c\u0103tre un nou proprietar, care nu se \u00eent\u00e2mpl\u0103 instantaneu. Poate dura \u00eentre 24 \u0219i 72 de ore p\u00e2n\u0103 c\u00e2nd comutarea este complet\u0103 \u0219i site-ul t\u0103u va \u00eencepe s\u0103 apar\u0103 pe noul s\u0103u domeniu.&nbsp;<\/p>\n\n\n\n<p>\u00cen acest articol vom analiza toate lucrurile legate de propagarea DNS. Cite\u0219te mai departe pentru a afla ce \u00eenseamn\u0103 un DNS server, ce este propagarea DNS, cum func\u021bioneaz\u0103 \u0219i care sunt factorii care influen\u021beaz\u0103 durata acestuia.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#ceinseamnadnsserversicumfunctioneaza\">Ce \u00eenseamn\u0103 DNS server \u0219i cum func\u021bioneaz\u0103?<\/a><\/li><li><a href=\"#ceestepropagareadomeniului\">Ce este exact propagarea domeniului?<\/a><\/li><li><a href=\"#factoriicareafecteazapropagareadns\">Factori care afecteaz\u0103 propagarea DNS<\/a><\/li><li><a href=\"#catdureazapropagareadns\">C\u00e2t dureaz\u0103 propagarea DNS?<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ceinseamnadnsserversicumfunctioneaza\"><strong>Ce \u00eenseamn\u0103 DNS server \u0219i cum func\u021bioneaz\u0103?<\/strong><\/h2>\n\n\n\n<p>Pentru a \u00een\u021belege ce \u00eenseamn\u0103 propagarea DNS, trebui s\u0103 clarific\u0103m mai \u00eent\u00e2i ce sunt serverele DNS \u0219i cum func\u021bioneaz\u0103 acestea.<\/p>\n\n\n\n<p>Atunci c\u00e2nd folosim internetul, oamenii utilizeaz\u0103 numele de domenii, iar computerele adrese IP. De aceea, avem nevoie de un sistem de traducere a numelui de domeniu \u00een adres\u0103 IP a serverului.<\/p>\n\n\n\n<p>Site-ul t\u0103u este g\u0103zduit pe un server web (\u00eentr-un centru de date), iar acest server web are propria sa adres\u0103 IP (Internet Protocol Adress). Pe l\u00e2ng\u0103 serverele web, exist\u0103 mii de servere DNS localizate \u00een \u00eentreaga lume.&nbsp;&nbsp;<\/p>\n\n\n\n<p>C\u00e2nd un nume de domeniu este introdus \u00eentr-un browser, DNS (Domain Name System) este cel care traduce acest nume de domeniu \u00eentr-o adres\u0103 IP pentru a localiza site-ul. Rolul unui server DNS este de a asocia numele de domenii cu adresele IP.<\/p>\n\n\n\n<p>Iat\u0103 ce se \u00eent\u00e2mpl\u0103 pas cu pas atunci c\u00e2nd introduci numele de domeniu al site-ului \u00een browser:<\/p>\n\n\n\n<p>Totul \u00eencepe \u00een momentul introducerii numelui de domeniu \u00een browser, unde o pagin\u0103 web va ap\u0103rea un moment mai t\u00e2rziu. Pe parcursul acestor c\u00e2teva milisecunde, computerul \u0219i alte dispozitive de re\u021bea vor efectua zeci de interog\u0103ri DNS, astfel \u00eenc\u00e2t browserul s\u0103 poat\u0103 \u00eencepe \u00eenc\u0103rcarea paginii. Iat\u0103 care sunt etapele acestui proces:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Browserul web solicit\u0103 sistemului de operare adresa IP a site-ului.<\/li><li>Sistemul de operare verific\u0103 \u00een cache dac\u0103 cunoa\u0219te adresa IP a site-ului. Este posibil s\u0103 fi vizitat anterior acel site \u0219i atunci computerul cunoa\u0219te adresa. Dac\u0103 nu, solicit\u0103 adresa IP serverului DNS.<\/li><li>Cel mai adesea, primul server DNS \u00eenregistrat \u00een computer este routerul de acas\u0103 sau de la birou. Routerul func\u021bioneaz\u0103 la fel ca \u0219i computerul, verific\u0103 \u00een memoria cache dac\u0103 adresa IP a domeniului este cunoscut\u0103. Poate c\u0103 cineva a vizitat site-ul \u00eenainte \u0219i atunci memoria cache \u00ee\u0219i aminte\u0219te adresa.<\/li><li>Dac\u0103 routerul nu cunoa\u0219te adresa IP, \u00ee\u0219i \u00eendreapt\u0103 solicitarea c\u0103tre serverele DNS. Cache-ul este disponibil \u0219i aici.<\/li><li>Merg\u00e2nd mai departe, serverele DNS ale furnizorilor de internet solicit\u0103 adresa serverelor DNS suplimentare, inclusiv serverelor root.<\/li><li>\u00cen cele din urm\u0103, r\u0103spunsul va fi c\u0103 domeniul este suportat de un server DNS specific.<\/li><li>Serverul DNS definit pentru un domeniu va r\u0103spunde cu o adres\u0103 IP c\u0103tre browserul de internet.<\/li><li>\u00cen func\u021bie de set\u0103ri, toate serverele DNS vor fi capabile s\u0103 \u00ee\u0219i aminteasc\u0103 acea adresa IP \u0219i o vor stoca \u00eentr-o cache.<\/li><\/ul>\n\n\n\n<p>A\u0219adar, \u00eenainte ca browserul t\u0103u s\u0103 g\u0103seasc\u0103 adresa IP a unui site web, acesta trebuie s\u0103 parcurg\u0103 un proces complicat, care \u00een func\u021bie de ceea ce se afl\u0103&nbsp; \u00een memoria cache, poate fi mai scurt sau mai lung.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ceestepropagareadomeniului\"><strong>Ce este propagarea domeniului?<\/strong><\/h2>\n\n\n\n<p>Propagarea domeniului, denumit\u0103 \u0219i propagarea DNS, este procesul de actualizare a fiec\u0103rui server de pe internet cu informa\u021bii noi. G\u00e2nde\u0219te-te c\u0103 exist\u0103 miliarde de servicii pe internet \u0219i toate trebuie actualizate. Ca atare, nu este de mirare c\u0103 exist\u0103 un decalaj \u00eentre momentul \u00een care se fac modific\u0103rile respective \u0219i cel \u00een care toate serverele au \u00eenregistrat acele modific\u0103ri.<\/p>\n\n\n\n<p>C\u00e2nd un site web este mutat pe un server nou prime\u0219te o adres\u0103 IP diferit\u0103. La fel, c\u00e2nd un nou domeniu este \u00eenregistrat, prime\u0219te o adresa IP nou\u0103. Fiecare server DNS din lume trebuie s\u0103 \u00ee\u0219i actualizeze \u00eenregistrarea cu privire la ce IP este asociat acestui domeniu. Acest proces se nume\u0219te propagare. Cu alte cuvinte, propagarea este timpul necesar pentru actualizarea global\u0103 a DNS (Domain Name System) \u00een urma unei modific\u0103ri la DNS.<\/p>\n\n\n\n<p>Modific\u0103rile \u00eenregistr\u0103rilor DNS nu se propag\u0103 pe internet imediat, deoarece toate cache-urile serverului trebuie s\u0103 expire \u0219i s\u0103 se re\u00eemprosp\u0103teze, care de obicei dureaz\u0103 \u00eentre 24 p\u00e2n\u0103 la 72 de ore.<\/p>\n\n\n\n<p>\u00cen acest timp, dac\u0103 \u00ee\u021bi transferi domeniul c\u0103tre un alt furnizor de g\u0103zduire web, unii nameservers se vor referi \u00een continuare la vechea loca\u021bie de g\u0103zduire a site-ului t\u0103u, \u00een timp ce serverele care au fost deja notificate cu privire la modificare vor face referire la noua loca\u021bie. Drept urmare, vizitatorii care acceseaz\u0103 site-ul t\u0103u pot fi direc\u021biona\u021bi c\u0103tre loca\u021bia veche sau c\u0103tre cea nou\u0103, \u00een func\u021bie de nameserverul la care se conecteaz\u0103.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"factoriicareafecteazapropagareadns\"><strong>Factori care afecteaz\u0103 propagarea DNS<\/strong><\/h2>\n\n\n\n<p>Timpul de propagare poate fi u\u0219or accelerat. Putem face unele lucruri singuri, iar unele dintre acestea sunt \u00een m\u00e2inile furnizorului de internet.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Parametrul TTL<\/strong> (Time To Live) &#8211; acest parametru este setat pe serverul DNS care administreaz\u0103 domeniul. Acesta determin\u0103 timpul de stocare a informa\u021biilor despre domeniul din cache. Cu c\u00e2t valoarea cache este mai mic\u0103, cu at\u00e2t va fi mai frecvent\u0103 verificarea \u00eenregistr\u0103rilor curente pentru domeniu. Din p\u0103cate, acest parametru este adesea ignorat de mul\u021bi furnizori de internet.<\/li><li><strong>Actualizarea \u00eenregistr\u0103rilor DNS \u00een registrul de domenii <\/strong>&#8211; nu putem influen\u021ba cu nimic acest aspect. De exemplu, exist\u0103 registre care re\u00eemprosp\u0103teaz\u0103 datele la fiecare 15 minute, dar domeniile globale se actualizeaz\u0103 \u00een medie la fiecare dou\u0103 ore.<\/li><li><strong>Cache-ul pe computerul local <\/strong>&#8211; Calculatorul t\u0103u poate, de asemenea, s\u0103 stocheze adresele IP ale paginilor vizitate \u00een cache, f\u0103r\u0103 a mai fi nevoie s\u0103 interogheze serverul DNS. Aceast\u0103 memorie cache poate fi cur\u0103\u021bat\u0103 de tine folosind comenzi specifice, \u00een func\u021bie de sistemul de operare.<\/li><li><strong>Re\u00eemprosp\u0103tarea cache-ului din Google DNS<\/strong> &#8211; Google ofer\u0103 instrumentul Flush Cache, care \u00ee\u021bi permite s\u0103 re\u00eemprosp\u0103tezi memoria cache din DNS-ul lor.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"catdureazapropagareadns\"><strong>C\u00e2t dureaz\u0103 propagarea DNS?<\/strong><\/h2>\n\n\n\n<p>Nimeni nu poate \u0219tii cu exactitate \u0219i nu poate garanta o durat\u0103 anume de propagare DNS. \u00cen anumite cazuri poate dura 24 de ore, \u00een altele p\u00e2n\u0103 la 48-72 de ore, \u00een func\u021bie de factorii mai sus men\u021biona\u021bi.&nbsp;<\/p>\n\n\n\n<p>\u00ce\u021bi recomand\u0103m s\u0103 iei \u00een considerare durata maxim\u0103 de propagare DNS \u0219i s\u0103 verifici cu furnizorul de hosting web dac\u0103 totul este \u00een regul\u0103, \u00eenainte s\u0103 \u00eencepi s\u0103 direc\u021bionezi trafic masiv pe site prin campanii de promovare sau alte ac\u021biuni concrete. Este foarte important ca furnizorul t\u0103u de g\u0103zduire web s\u0103 \u00ee\u021bi ofere suport 24\/7. <a href=\"https:\/\/www.thc.ro\/blog\/de-ce-ai-nevoie-de-suport-gazduire-web-24-din-7\/\">Afl\u0103 de ce este at\u00e2t important s\u0103 beneficiezi de suport pentru g\u0103zduire web 24\/7 de la furnizorul t\u0103u.<\/a><\/p>\n\n\n\n<p>A\u0219adar, cel mai bun lucru pe care \u00eel po\u021bi face este s\u0103 r\u0103m\u00e2i calm \u0219i s\u0103 ai r\u0103bdare c\u00e2teva zile p\u00e2n\u0103 ce procesul de propagare DNS se va \u00eencheia. De asemenea, ne po\u021bi adresa \u00eentreb\u0103ri \u00een sec\u021biunea de comentarii sau pe <a href=\"https:\/\/www.thc.ro\/contact\">thc.ro<\/a>&nbsp;<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Propagarea DNS este procesul de actualizare a serverelor de pe internet cu informa\u021bii noi. Afl\u0103 ce \u00eenseamn\u0103 exact acest lucru \u0219i c\u00e2t poate dura.<\/p>\n","protected":false},"author":3,"featured_media":2358,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Propagarea DNS este procesul de actualizare a serverelor de pe internet cu informa\u021bii noi. Afl\u0103 ce \u00eenseamn\u0103 exact acest lucru \u0219i c\u00e2t poate dura.\n","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[37],"tags":[378,375,377,376],"class_list":["post-2357","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-despre-gazduire-web","tag-ce-inseamna-dns-server","tag-propagare-dns","tag-propagare-domeniu","tag-server-dns"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Propagarea DNS - Ce este, cum func\u021bioneaz\u0103 \u0219i c\u00e2t dureaz\u0103? - Blog THC.ro<\/title>\n<meta name=\"description\" content=\"Propagarea DNS este procesul de actualizare a serverelor de pe internet cu informa\u021bii noi. 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