{"id":312,"date":"2021-02-25T15:27:08","date_gmt":"2021-02-25T15:27:08","guid":{"rendered":"https:\/\/dev.sourcecode.sk\/wsczkb\/?post_type=ht_kb&p=312"},"modified":"2021-06-24T10:57:41","modified_gmt":"2021-06-24T08:57:41","slug":"jak-dlouho-trva-zmena-dns-zaznamu","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.cz\/podpora\/kb\/jak-dlouho-trva-zmena-dns-zaznamu\/","title":{"rendered":"Jak dlouho trv\u00e1 zm\u011bna DNS z\u00e1znamu?"},"content":{"rendered":"\n

P\u0159i zm\u011bn\u011b DNS z\u00e1znam\u016f m\u016f\u017ee\u00a0trvat a\u017e 24 hodin, dokud v\u0161echny servery na internetu dostanou nov\u00e9 informace. Maxim\u00e1ln\u00ed dobu ur\u010duje nastaven\u00ed parametru TTL.<\/p>\n\n\n\n

\n\n\n\n

Co je to TTL?<\/strong><\/h3>\n\n\n\n

Zkratka TTL znamen\u00e1 „Time To Live“. Je ud\u00e1van\u00e1 v sekund\u00e1ch a ozna\u010duje dobu, na jak dlouho\u00a0m\u016f\u017ee b\u00fdt DNS z\u00e1znam uchovan\u00fd v cache pam\u011bti DNS serveru u poskytovatele internetu. \u010casto je ud\u00e1van\u00e1 hodnota 86400 sekund, co\u017e je 24 hodin. Potom co doba TTL uplyne, jsou\u00a0DNS nastaven\u00ed nanovo na\u010d\u00edtan\u00e9.<\/p>\n\n\n\n

Pro\u010d m\u016f\u017ee trvat zm\u011bna DNS a\u017e 24 hodin?<\/strong><\/h3>\n\n\n\n

Po\u010d\u00edta\u010de p\u0159istupuj\u00ed k c\u00edlov\u00e9mu serveru s obsahem dom\u00e9ny\u00a0r\u016fzn\u00fdmi cestami. Na IP adresu c\u00edlov\u00e9ho serveru se\u00a0dopt\u00e1vaj\u00ed r\u016fzn\u00fdch DNS server\u016f. Servery kter\u00e9 jsou „po cest\u011b“ si v\u0161ak kv\u016fli sn\u00ed\u017een\u00ed z\u00e1t\u011b\u017ee ukl\u00e1daj\u00ed hodnoty DNS nastaven\u00ed do svoj\u00ed\u00a0cache pam\u011bti. Dobu ulo\u017een\u00ed ur\u010duje pr\u00e1v\u011b hodnota\u00a0TTL. Z toho d\u016fvodu, m\u016f\u017ee DNS server po\u010d\u00edta\u010di vracet je\u0161t\u011b starou hodnotu nastaven\u00ed DNS a to a\u017e do doby ne\u017e vypr\u0161\u00ed TTL. Potom DNS server sv\u016fj z\u00e1znam aktualizuje.<\/p>\n\n\n\n

Jak se d\u00e1 zjistit, jestli se u\u017e zm\u011bna projevila?<\/strong><\/h3>\n\n\n\n

Pokud zn\u00e1te IP adresu nov\u00e9ho c\u00edlov\u00e9ho serveru, sta\u010d\u00ed zadat p\u0159\u00edkaz ping v p\u0159\u00edkazov\u00e9m \u0159\u00e1dku (nap\u0159. „ping\u00a037.9.168.19“). Pokud IP adresu nezn\u00e1te, je lep\u0161\u00ed pou\u017e\u00edt p\u0159\u00edkaz tracert (nap\u0159. „tracert websupport.sk“). Tento p\u0159\u00edkaz V\u00e1m zobraz\u00ed p\u0159es jak\u00e9 uzly se V\u00e1\u0161 po\u010d\u00edta\u010d k c\u00edlov\u00e9mu serveru p\u0159ipojuje.<\/p>\n\n\n\n

Zm\u011bna se ani po 24 hodin\u00e1ch neprojevila, je to mo\u017en\u00e9?<\/strong><\/h3>\n\n\n\n

Ano, ve v\u00fdjime\u010dn\u00fdch p\u0159\u00edpadech m\u016f\u017ee trvat zm\u011bna\u00a0DNS i d\u00e9le ne\u017e 24 hodin. Nap\u0159\u00edklad pokud je na n\u011bjak\u00e9m DNS serveru\u00a0„po cest\u011b“ nastaven\u00e9 TTL na v\u00edce ne\u017e 86400 sekund. Dal\u0161\u00ed mo\u017enost je, \u017ee p\u016fvodn\u00ed nastaven\u00ed DNS jsou ulo\u017een\u00e9 v lok\u00e1ln\u00ed DNS cache\u00a0po\u010d\u00edta\u010de. Tuto cache je mo\u017en\u00e9 vypr\u00e1zdnit pomoc\u00ed p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku a p\u0159\u00edkazu\u00a0Flushdns.<\/strong><\/p>\n\n\n\n

Ve Windows<\/strong> postupujte n\u00e1sledovn\u011b:<\/p>\n\n\n\n

1. Klikn\u011bte na tla\u010d\u00edtko „Start“ a spus\u0165te „cmd“. V nov\u011bj\u0161\u00edch verz\u00edch Windows, sta\u010d\u00ed „cmd“ napsat do \u0159\u00e1dku vyhled\u00e1v\u00e1n\u00ed a stla\u010dit „Enter“, u star\u0161\u00edch verz\u00ed je nutn\u00e9 kliknout na „Spustit“ a a\u017e n\u00e1sledn\u011b „cmd“ napsat.<\/p>\n\n\n\n

2. Do zobrazen\u00e9ho okna, m\u016f\u017eete napsat p\u0159\u00edkaz „ipconfig \/flushdns“ a stla\u010dte „Enter“. Pokud se zobraz\u00ed hl\u00e1\u0161ka, \u017ee pam\u011b\u0165 byla promazan\u00e1, prob\u011bhlo v\u0161echno v po\u0159\u00e1dku.<\/p>\n\n\n\n


<\/p>\n","protected":false},"excerpt":{"rendered":"

P\u0159i zm\u011bn\u011b DNS z\u00e1znam\u016f m\u016f\u017ee\u00a0trvat a\u017e 24 hodin, dokud v\u0161echny servery na internetu dostanou nov\u00e9 informace. Maxim\u00e1ln\u00ed dobu ur\u010duje nastaven\u00ed parametru TTL. Co je to TTL? Zkratka TTL znamen\u00e1 „Time To Live“. Je ud\u00e1van\u00e1 v sekund\u00e1ch a ozna\u010duje dobu, na jak dlouho\u00a0m\u016f\u017ee b\u00fdt DNS z\u00e1znam uchovan\u00fd v cache pam\u011bti DNS…<\/p>\n","protected":false},"author":3,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[12,75],"ht-kb-tag":[],"class_list":["post-312","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-dns-zaznamy","ht_kb_category-domeny"],"yoast_head":"\nJak dlouho trv\u00e1 zm\u011bna DNS z\u00e1znamu? - Websupport Centrum n\u00e1pov\u011bdy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.cz\/podpora\/kb\/jak-dlouho-trva-zmena-dns-zaznamu\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jak dlouho trv\u00e1 zm\u011bna DNS z\u00e1znamu? - Websupport Centrum n\u00e1pov\u011bdy\" \/>\n<meta property=\"og:description\" content=\"P\u0159i zm\u011bn\u011b DNS z\u00e1znam\u016f m\u016f\u017ee\u00a0trvat a\u017e 24 hodin, dokud v\u0161echny servery na internetu dostanou nov\u00e9 informace. 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