{"id":52194,"date":"2023-08-17T09:06:49","date_gmt":"2023-08-17T08:06:49","guid":{"rendered":"https:\/\/kinsta.com\/dk\/?p=52194&#038;post_type=knowledgebase&#038;preview_id=52194"},"modified":"2025-10-01T20:02:48","modified_gmt":"2025-10-01T19:02:48","slug":"hvad-er-dns","status":"publish","type":"post","link":"https:\/\/kinsta.com\/dk\/blog\/hvad-er-dns\/","title":{"rendered":"Hvad er DNS? Dom\u00e6nenavnssystem forklaret"},"content":{"rendered":"<p>DNS, en forkortelse for <strong>Domain Name System<\/strong>, er en af de mest almindelige, men ogs\u00e5 mest misforst\u00e5ede komponenter i weblandskabet. For at sige det enkelt hj\u00e6lper DNS med at dirigere trafikken p\u00e5 internettet ved at forbinde dom\u00e6nenavne med faktiske webservere. I bund og grund tager det en menneskevenlig foresp\u00f8rgsel &#8211; et dom\u00e6nenavn som kinsta.com &#8211; og overs\u00e6tter den til en computervenlig server-IP-adresse &#8211; som 216.3.128.12.<\/p>\n<p>Fordi DNS handler om at sl\u00e5 adresser op og forbinde enheder, er der mange, der kalder DNS for &#8220;internettets telefonbog&#8221;. Uden DNS ville du v\u00e6re n\u00f8dt til at huske alle hjemmesiders IP-adresser for at f\u00e5 adgang til dem, hvilket&#8230; ja, det ville bare ikke fungere!<\/p>\n<ul>\n<li><a href=\"#how-dns-works\">Hvordan fungerer DNS?<\/a><\/li>\n<li><a href=\"#dns-propagation\">DNS-forplantning<\/a><\/li>\n<li><a href=\"#dns-configuration\">DNS-konfiguration &#8211; S\u00e5dan ops\u00e6tter du dit dom\u00e6ne<\/a><\/li>\n<li><a href=\"#free-dns-vs-premium-dns\">Gratis DNS vs Premium DNS<\/a><\/li>\n<\/ul>\n<h2 id=\"how-dns-works\">Hvordan fungerer DNS?<\/h2>\n<p>N\u00e5r en bruger indtaster en URL i sin webbrowser, g\u00e5r DNS i gang med at forbinde URL&#8217;en med IP-adressen p\u00e5 den aktuelle server. Dette kaldes DNS-navneopl\u00f8sning og indeb\u00e6rer, at en DNS-recursor foresp\u00f8rger forskellige navneservere for at finde ud af serverens faktiske IP-adresse.<\/p>\n<p>DNS besk\u00e6ftiger sig prim\u00e6rt med fire komponenter:<\/p>\n<ul>\n<li><a href=\"#domain-registrar\">Dom\u00e6neregistrator<\/a><\/li>\n<li><a href=\"#nameservers\">Navneservere<\/a><\/li>\n<li><a href=\"#dns-records\">DNS-poster<\/a><\/li>\n<li><a href=\"#web-based-services\">Webbaserede tjenester<\/a> (s\u00e5som hosting af hjemmesider og e-mail)<\/li>\n<\/ul>\n<p>Lad os tale om disse fire komponenter, og hvordan de arbejder sammen.<\/p>\n<h3 id=\"domain-registrar\">Dom\u00e6neregistrator<\/h3>\n<p>En dom\u00e6neregistrator er den tjenesteudbyder, hvor <a href=\"https:\/\/kinsta.com\/dk\/blog\/hvor-meget-koster-et-domaenenavn\/\">dom\u00e6nenavne k\u00f8bes<\/a>, og hvor dom\u00e6neregistreringen vedligeholdes (f.eks. <a href=\"https:\/\/kinsta.com\/godaddy-alternative\/\" target=\"_blank\" rel=\"noopener noreferrer\">GoDaddy<\/a> eller Namecheap). Kinsta tilbyder ikke dom\u00e6neregistrering, men her er vores <a href=\"https:\/\/kinsta.com\/dk\/blog\/bedste-domaeneregistrator\/\" target=\"_blank\" rel=\"noopener noreferrer\">liste over de bedste dom\u00e6neregistratorer<\/a>.<\/p>\n<p><strong>Registratoren er der, hvor dom\u00e6nenavnsserverne er specificeret.<\/strong><\/p>\n<p>De fleste registratorer inkluderer grundl\u00e6ggende DNS-service i prisen for dom\u00e6neregistrering. Det betyder, at medmindre du tilf\u00f8jer egne navneservere til dom\u00e6net, vil dom\u00e6net bruge registratorens standardnavneservere. Det betyder, at DNS-records i langt de fleste tilf\u00e6lde som standard administreres af registratoren.<\/p>\n<h3 id=\"nameservers\">Navneservere<\/h3>\n<p><a href=\"https:\/\/kinsta.com\/dk\/blog\/hvad-er-en-navneserver\/\">Navneservere<\/a> er servere, der minder meget om webservere. Men de er konfigureret til at <strong>gemme DNS-records<\/strong> i stedet for at servere hjemmesider eller webapplikationer.<\/p>\n<p>Det betyder, at n\u00e5r du vil \u00e6ndre en DNS-record, skal du \u00e6ndre disse DNS-records p\u00e5 de navneservere, der er angivet af registratoren eller en tredjepartstjeneste som Cloudflare.<\/p>\n<p>Dette trin er ofte lidt forvirrende, s\u00e5 lad os forklare det lidt n\u00e6rmere ved at se p\u00e5 et fiktivt eksempel:<\/p>\n<ol>\n<li>Dit dom\u00e6ne (example.com) er registreret hos GoDaddy.<\/li>\n<li>Du tilf\u00f8jer Cloudflares navne-erverer til example.com p\u00e5 din GoDaddy-konto for at begynde at bruge Cloudflare.<\/li>\n<li>Du \u00e6ndrer en DNS-post for example.com hos GoDaddy. Denne \u00e6ndring vil ikke g\u00f8re noget, fordi dom\u00e6net ikke bruger GoDaddys navneservere.<\/li>\n<li>Du foretager den samme DNS-\u00e6ndring for example.com hos Cloudflare. Denne \u00e6ndring vil v\u00e6re effektiv, fordi dom\u00e6net bruger Cloudflares navneservere.<\/li>\n<\/ol>\n<p>S\u00e5 med andre ord, hvis du kun bruger GoDaddy, skal du opdatere dine DNS-records hos GoDaddy, da de kontrollerer dine navneservere. Hvis du bruger Cloudflare, skal du opdatere dine DNS-records med Cloudflare, da de kontrollerer dine navneservere. Det samme g\u00e6lder for dem, der bruger Kinsta DNS.<\/p>\n<p>Du kan ikke bes\u00f8ge en hjemmeside uden f\u00f8rst at tilg\u00e5 en dom\u00e6nenavnsserver. I den proces kan du blive m\u00f8dt med en besked som &#8220;<a href=\"https:\/\/kinsta.com\/dk\/blog\/dns-server-svarer-ikke\/\">DNS-server svarer ikke<\/a>&#8220;, hvilket dybest set betyder, at de decentraliserede navnesystemer, der er ansvarlige for at omdanne hostsnavne til IP-adresser, ikke svarede.<\/p>\n<h3 id=\"dns-records\">DNS-records<\/h3>\n<p><strong>DNS-records forbinder et dom\u00e6ne med en webbaseret tjeneste.<\/strong><\/p>\n<p>Der findes flere forskellige typer DNS-records, men i de fleste tilf\u00e6lde bruges kun 4 eller 5 typer DNS-records:<\/p>\n<ul>\n<li><strong>A-records<\/strong>: Bruges til at pege et dom\u00e6ne eller et underdom\u00e6ne p\u00e5 en <a href=\"https:\/\/kinsta.com\/docs\/wordpress-hosting\/site-management\/ip-addresses\/#site-ip-address-ipv4\" target=\"_blank\" rel=\"noopener noreferrer\">IPv4-adresse<\/a>. Det er den regel, der bruges til at pege et dom\u00e6ne som example.com til den webserver, hvor websitet example.com ligger. (Bem\u00e6rk: Hvis en webserver bruger en IPv6-adresse i stedet for en IPv4-adresse, bruges en AAAA-record i stedet for en A-record).<\/li>\n<li><strong>CNAME-records<\/strong>: Bruges til at knytte et subdom\u00e6ne til det prim\u00e6re eller kanoniske dom\u00e6ne. Denne type regel bruges ofte til at forbinde et www-underdom\u00e6ne med det prim\u00e6re dom\u00e6ne, f.eks. www.example.com med example.com.<\/li>\n<li><strong>MX-records<\/strong>: Bruges til at forbinde et dom\u00e6ne med en e-mailtjeneste. Det er den type regel, der bruges, hvis du vil have mail til example.com leveret til en bestemt e-mailtjeneste som Gmail.<\/li>\n<li><strong>TXT-records<\/strong>: Bruges til at knytte en vilk\u00e5rlig tekst til et dom\u00e6ne. Oftest bruges TXT-records til at knytte SPF-records til et dom\u00e6ne for at forbedre e-mailleveringsevnen og beskytte mod spammere, der misbruger dom\u00e6nenavnet, n\u00e5r de udsender spam. Se vores uddybende blogindl\u00e6g om <a href=\"https:\/\/kinsta.com\/dk\/blog\/email-godkendelse\/\" target=\"_blank\" rel=\"noopener noreferrer\">e-mailgodkendelse<\/a>, og hvorfor det er vigtigt.<\/li>\n<\/ul>\n<figure style=\"width: 904px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/10\/mykinsta-dns-add-a-record.png\" alt=\"Sk\u00e6rmbillede: Tilf\u00f8jelse af en A-record i Kinstas DNS.\" width=\"904\" height=\"462\"><figcaption class=\"wp-caption-text\">Tilf\u00f8jelse af en A-record i Kinstas DNS.<\/figcaption><\/figure>\n<h3 id=\"web-based-services\">Webtjenester<\/h3>\n<p>I vores tilf\u00e6lde er webtjenesten hosting af hjemmesider. En A-record (eller AAAA-record) skal f\u00f8jes til et dom\u00e6nes navneservere for at forbinde det dom\u00e6ne med de webservere, der hoster webstedet.<\/p>\n<p>Der er mange andre typer webtjenester, der er forbundet med et dom\u00e6ne via DNS-records: e-mail, SFTP, hosting-kontrolpaneler, webmail-applikationer og phpMyAdmin for blot at n\u00e6vne nogle f\u00e5.<\/p>\n<h2 id=\"dns-propagation\">DNS-forplantning<\/h2>\n<p>N\u00e5r du foretager en \u00e6ndring i DNS for et givet dom\u00e6ne &#8211; f.eks. opdaterer en DNS-record eller skifter navneserver &#8211; tager det noget tid, f\u00f8r \u00e6ndringerne tr\u00e6der i kraft. <a href=\"https:\/\/kinsta.com\/blog\/dns-propagation\/\" target=\"_blank\" rel=\"noopener noreferrer\">Denne tid kaldes propagation<\/a>.<\/p>\n<p>Forplantningen varierer betydeligt fra situation til situation.<\/p>\n<p>N\u00e5r det g\u00e6lder DNS-poster, har hver post en tilknyttet<strong> <a href=\"https:\/\/kinsta.com\/blog\/what-is-ttl\/\">TTL-v\u00e6rdi<\/a> (Time to Live)<\/strong>. Denne v\u00e6rdi bestemmer, hvor hurtigt \u00e6ndringer i DNS-records vil tr\u00e6de i kraft.<\/p>\n<p>I de fleste tilf\u00e6lde er TTL for DNS-records som standard sat til 1 eller 4 timer. Det betyder, at DNS-\u00e6ndringer for det meste vil v\u00e6re op til 4 timer om at tr\u00e6de i kraft. H\u00f8jere TTL-v\u00e6rdier er ogs\u00e5 mulige og vil betyde, at n\u00e5r en DNS-record opdateres, vil det tage l\u00e6ngere tid, f\u00f8r \u00e6ndringerne f\u00e5r fuld effekt. I nogle ekstreme tilf\u00e6lde kan TTL-v\u00e6rdierne v\u00e6re s\u00e5 h\u00f8je som en uge.<\/p>\n<p>N\u00e5r det g\u00e6lder navneservere, er det registratoren, der bestemmer TTL-v\u00e6rdien, og den kan generelt ikke \u00e6ndres. Det betyder, at n\u00e5r du skifter til nye navneservere, kan det tage fra et par minutter op til en dag eller l\u00e6ngere, f\u00f8r \u00e6ndringerne tr\u00e6der i kraft.<\/p>\n<p>Hostingudbyderen (Kinsta) kan ikke fremskynde <a href=\"https:\/\/kinsta.com\/blog\/dns-propagation\/\" target=\"_blank\" rel=\"noopener noreferrer\">DNS-forplantningen<\/a>. Det, du kan g\u00f8re, er at reducere TTL i god tid, f\u00f8r du foretager \u00e6ndringer i DNS-records, s\u00e5 \u00e6ndringerne spredes s\u00e5 hurtigt som muligt. Du kan bruge et onlinev\u00e6rkt\u00f8j som <a href=\"https:\/\/www.whatsmydns.net\/\" target=\"_blank\" rel=\"noopener noreferrer\">whatsmydns.net<\/a> til at teste, om dine DNS-\u00e6ndringer er f\u00e6rdige med at forplante sig.<\/p>\n<h2 id=\"dns-configuration\">DNS-konfiguration &#8211; S\u00e5dan ops\u00e6tter du dit dom\u00e6ne<\/h2>\n<p>Der er to m\u00e5der, hvorp\u00e5 du normalt ops\u00e6tter din DNS. Kinsta underst\u00f8tter begge metoder, og du kan v\u00e6lge, hvilken metode du foretr\u00e6kker.<\/p>\n<p>En metode er simpelthen at pege dit dom\u00e6nes navneservere til din hosts navneservere via din dom\u00e6nenavnsregistrator. Dette er mindst to separate dom\u00e6ner, der ser nogenlunde s\u00e5dan ud (du kan have mere end to navneservere, bare ikke f\u00e6rre):<\/p>\n<ul>\n<li>ns1.yourhost.com<\/li>\n<li>ns2.yourhost.com<\/li>\n<\/ul>\n<p>Hos Kinsta samarbejdede vi med Amazon Route 53 for at tilbyde premium navneservere til vores kunder uden ekstra omkostninger. Dette er fire separate navneservere, der ser nogenlunde s\u00e5dan ud:<\/p>\n<ul>\n<li>ns-xxx.awsdns-60.net<\/li>\n<li>ns-xxxx.awsdns-27.org<\/li>\n<\/ul>\n<figure style=\"width: 1193px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/10\/mykinsta-dns-successful-domain.png\" alt=\"Sk\u00e6rmbillede: Kinstas DNS-navneservere i MyKinsta.\" width=\"1193\" height=\"525\"><figcaption class=\"wp-caption-text\">Kinstas Amazon Route 53-navneservere i MyKinsta.<\/figcaption><\/figure>\n<p>Uanset om du bruger Kinstas gratis premium DNS eller en tredjeparts, skal du konfigurere de poster, der peger p\u00e5 dit prim\u00e6re dom\u00e6ne og eventuelle yderligere dom\u00e6ner p\u00e5 dit websted.<\/p>\n<p>Hvis dit websted er hostet hos os, vil du gerne l\u00e6se vores guide til at <a href=\"https:\/\/kinsta.com\/docs\/wordpress-hosting\/wordpress-domains\/\" target=\"_blank\" rel=\"noopener noreferrer\">tilf\u00f8je et dom\u00e6ne til et websted p\u00e5 Kinsta<\/a>, som ogs\u00e5 d\u00e6kker forskellige permutationer af vores platforms integration med Cloudflare.<\/p>\n<p>For mere detaljerede oplysninger om opdatering af DNS hos nogle popul\u00e6re registratorer og DNS-administratorer, se disse artikler:<\/p>\n<ul>\n<li><a href=\"https:\/\/kinsta.com\/blog\/godaddy-a-record\/\">S\u00e5dan tilf\u00f8jer du en A-record hos GoDaddy<\/a><\/li>\n<li><a href=\"https:\/\/kinsta.com\/blog\/bluehost-a-record-cname\/\">S\u00e5dan tilf\u00f8jes en A-record og CNAME hos Bluehost<\/a><\/li>\n<li><a href=\"https:\/\/kinsta.com\/blog\/namecheap-add-a-record\/\">S\u00e5dan tilf\u00f8jes en A-record med Namecheap<\/a><\/li>\n<\/ul>\n<h2 id=\"free-dns-vs-premium-dns\">Gratis DNS vs Premium DNS<\/h2>\n<p>Du kan finde b\u00e5de gratis DNS og premium DNS. Alle Kinsta-kunder f\u00e5r adgang til premium DNS via Amazon Route 53. Og generelt mener vi, at <a href=\"https:\/\/kinsta.com\/blog\/premium-dns\/\">premium DNS er en n\u00f8dvendighed<\/a> i dagens verden.<\/p>\n<p>En stor grund til at v\u00e6lge premium DNS er <strong>hastighed<\/strong> <strong>og p\u00e5lidelighed<\/strong>. Det tager tid at sl\u00e5 DNS-poster op og dirigere trafik, selv om det kun er et sp\u00f8rgsm\u00e5l om millisekunder.<\/p>\n<p>Typisk er den gratis DNS, som du f\u00e5r fra din dom\u00e6neregistrator, forholdsvis langsom, mens premium DNS ofte tilbyder bedre ydeevne.<\/p>\n<p>Derudover kan premium DNS tilbyde bedre sikkerhed og tilg\u00e6ngelighed, is\u00e6r n\u00e5r du er under et <a href=\"https:\/\/kinsta.com\/dk\/blog\/hvad-er-et-ddos-angreb\/\">DDoS-angreb<\/a>.<\/p>\n<p>Cloudflare DNS er en god mellemting mellem den gratis DNS fra din dom\u00e6neregistrator og premium DNS, og det er en gratis tjeneste, som stadig tilbyder mange af fordelene ved premium DNS. Men v\u00e6r opm\u00e6rksom p\u00e5, at hvis du <a href=\"https:\/\/kinsta.com\/dk\/blog\/installeres-cloudflare\/\" target=\"_blank\" rel=\"noopener noreferrer\">bruger Cloudflare<\/a> DNS, kan du ikke bruge den inkluderede premium DNS fra Amazon Route 53.<\/p>\n<h2>Opsummering<\/h2>\n<p>Forh\u00e5bentlig forst\u00e5r du nu lidt mere om, hvordan DNS fungerer. For at opsummere bruges DNS til at knytte webbaserede tjenester, som f.eks. hosting af hjemmesider og e-mail, til et dom\u00e6nenavn. Dette involverer fire trin:<\/p>\n<ol>\n<li>Dom\u00e6net skal v\u00e6re registreret hos en dom\u00e6neregistrator.<\/li>\n<li>Navneservere skal specificeres af dom\u00e6neregistratoren.<\/li>\n<li>DNS-records skal tilf\u00f8jes til navneserverne, som er angivet af dom\u00e6neregistratoren eller en tredjepartstjeneste som Cloudflare.<\/li>\n<li>DNS-records skal v\u00e6re fuldt udbredte for at forbinde dom\u00e6net med hver relevant webtjeneste.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>DNS, en forkortelse for Domain Name System, er en af de mest almindelige, men ogs\u00e5 mest misforst\u00e5ede komponenter i weblandskabet. For at sige det enkelt hj\u00e6lper &#8230;<\/p>\n","protected":false},"author":38,"featured_media":52195,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[31,60],"topic":[692],"class_list":["post-52194","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-dns","tag-webhosting","topic-domain-name-system"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hvad er DNS? 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