{"id":16004,"date":"2024-08-04T13:14:14","date_gmt":"2024-08-04T09:44:14","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=16004"},"modified":"2024-08-04T13:14:14","modified_gmt":"2024-08-04T09:44:14","slug":"check-and-change-hostname-on-debian","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/de\/tutorials\/check-and-change-hostname-on-debian\/","title":{"rendered":"Hostnamen in Debian pr\u00fcfen und \u00e4ndern"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">Einf\u00fchrung<\/h2>\n<p>Der Hostname eines Linux-Systems ist ein wichtiger Bestandteil des Systems. Er dient nicht nur der Identifizierung des Systems f\u00fcr Sie selbst, sondern auch f\u00fcr Software, die h\u00e4ufig einen korrekt konfigurierten Hostnamen zur eindeutigen Identifizierung ben\u00f6tigt. In der Praxis ist ein Hostname ein Name, der Ihrer IP-Adresse \u00e4hnelt. Er ist der Dom\u00e4nenname, der dem Host-Rechner zugewiesen wird. Sie k\u00f6nnen mehrere Hostnamen konfigurieren, aber um eine vollst\u00e4ndige Identifizierung zu gew\u00e4hrleisten, sollten Sie jedem Host nur einen Namen zuweisen.<\/p>\n<p>Wenn Sie beispielsweise nur einen Server f\u00fcr eine kleine statische Webseite haben, k\u00f6nnten Sie so etwas wie foo.bar verwenden.<\/p>\n<p>Die empfohlene Vorgehensweise ist jedoch, einen Namen zu w\u00e4hlen, der dem Server angezeigt werden kann, zum Beispiel:<\/p>\n<ul>\n<li>E-Mails an einen Mailserver<\/li>\n<li>Web f\u00fcr einen Webserver<\/li>\n<\/ul>\n<h5 id=\"%d9%be%db%8c%d8%b4-%d9%86%db%8c%d8%a7%d8%b2%d9%87%d8%a7\">Voraussetzungen<\/h5>\n<ul>\n<li>Um den Hostnamen vollst\u00e4ndig zu qualifizieren, m\u00fcssen Sie den rDNS-Eintrag Ihres Ger\u00e4ts auf den gew\u00fcnschten FQHN (Fully Qualified Hostname) setzen. Dies k\u00f6nnen Sie in der Konsole Ihres Webservers vornehmen.<\/li>\n<li>Damit Ihr Hostname vollst\u00e4ndig qualifiziert ist, m\u00fcssen Sie einen A-Eintrag in der DNS-Zone f\u00fcr Ihren Hostnamen erstellen. In unserem Beispiel w\u00fcrden wir f\u00fcr den ersten kleinen Server der Domain foo.bar einen A-Eintrag mit dem Wert srv1.foo.bar und der IP-Adresse eines unserer Rechner erstellen. Nach 12\u201348 Stunden sollten die DNS-\u00c4nderungen global wirksam werden.<\/li>\n<li>Um den Hostnamen Ihres Servers zu \u00fcberpr\u00fcfen und zu \u00e4ndern, stellen Sie sicher, dass Sie mit einem sudo-Benutzer auf Ihrem Server angemeldet sind.<\/li>\n<li>Diese Anleitung basiert auf einem Server mit einer frischen Debian 12-Installation.<\/li>\n<\/ul>\n<h5 id=\"%d8%a7%d8%b5%d8%b7%d9%84%d8%a7%d8%ad%d8%a7%d8%aa-%d9%85%d8%ab%d8%a7%d9%84\">Beispielbegriffe<\/h5>\n<p>In unserem Beispiel (ein kleiner Server nur f\u00fcr verschiedene Dinge) verwenden wir srv1.foo.bar, damit wir sp\u00e4ter \u2013 falls wir weitere Server ben\u00f6tigen \u2013 den n\u00e4chsten Server einfach srv2.foo.bar nennen k\u00f6nnen.<\/p>\n<h2 id=\"%d9%85%d8%b1%d8%ad%d9%84%d9%87-1-%d9%86%d8%a7%d9%85-%d9%85%db%8c%d8%b2%d8%a8%d8%a7%d9%86-%d8%b1%d8%a7-%d8%a8%d8%b1%d8%b1%d8%b3%db%8c-%da%a9%d9%86%db%8c%d8%af\">Schritt 1 \u2013 \u00dcberpr\u00fcfen Sie den Hostnamen<\/h2>\n<p>Es gibt drei verschiedene M\u00f6glichkeiten, den tats\u00e4chlichen Hostnamen zu \u00fcberpr\u00fcfen.<\/p>\n<ul>\n<li>Erste:<\/li>\n<\/ul>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo cat \/etc\/hosts\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>Zweite:<\/li>\n<\/ul>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo hostname\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>Dritte:<\/li>\n<\/ul>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo hostname -f\r\n<\/code><\/pre>\n<\/div>\n<p>Die letzte Option zeigt Ihnen den vollst\u00e4ndigen Hostnamen an.<\/p>\n<h2 id=\"%d9%85%d8%b1%d8%ad%d9%84%d9%87-2-%d9%86%d8%a7%d9%85-%d9%85%db%8c%d8%b2%d8%a8%d8%a7%d9%86-%d8%b1%d8%a7-%d8%aa%d8%ba%db%8c%db%8c%d8%b1-%d8%af%d9%87%db%8c%d8%af\">Schritt 2 \u2013 \u00c4ndern Sie den Hostnamen<\/h2>\n<p>Es gibt mehrere M\u00f6glichkeiten, den Hostnamen zu \u00e4ndern.<\/p>\n<h5 id=\"%d9%86%d8%a7%d9%85-%d9%85%db%8c%d8%b2%d8%a8%d8%a7%d9%86-%d8%b1%d8%a7-%d8%a7%d8%b2-%d8%b7%d8%b1%db%8c%d9%82-%db%8c%da%a9-%d8%af%d8%b3%d8%aa%d9%88%d8%b1-%d8%aa%d8%ba%db%8c%db%8c%d8%b1-%d8%af%d9%87%db%8c\">\u00c4ndern Sie den Hostnamen \u00fcber einen Befehl<\/h5>\n<p>Die einfachste M\u00f6glichkeit w\u00e4re diese Option:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo hostnamectl set-hostname servername.fqdn.tld\r\n<\/code><\/pre>\n<\/div>\n<p>Starten Sie anschlie\u00dfend den SSH-Dienst neu, und der neue Hostname wird festgelegt:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo systemctl restart ssh\r\n<\/code><\/pre>\n<\/div>\n<h5 id=\"%d9%86%d8%a7%d9%85-%d9%85%db%8c%d8%b2%d8%a8%d8%a7%d9%86-%d8%b1%d8%a7-%d8%a8%d9%87-%d8%b5%d9%88%d8%b1%d8%aa-%d8%af%d8%b3%d8%aa%db%8c-%d8%aa%d8%ba%db%8c%db%8c%d8%b1-%d8%af%d9%87%db%8c%d8%af\">\u00c4ndern Sie den Hostnamen manuell<\/h5>\n<p>Sie k\u00f6nnen den Hostnamen auch manuell \u00e4ndern. \u00d6ffnen Sie dazu einfach ein paar Dateien und \u00e4ndern\/\u00fcberpr\u00fcfen Sie den Hostnamen:<\/p>\n<ul>\n<li>Hostname in \/etc\/hostname<\/li>\n<\/ul>\n<p>In dieser Datei sollte nur der Servername stehen. In unserem Fall \u201cServerName\u201d. Falls nicht oder falls Sie ihn manuell eingeben m\u00f6chten, \u00e4ndern Sie ihn einfach in den gew\u00fcnschten Namen.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo nano \/etc\/hostname\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>E-Mail-Name in \/etc\/mailname<\/li>\n<\/ul>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo nano \/etc\/mailname\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>Hostname in \/etc\/hosts<\/li>\n<\/ul>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>nano \/etc\/hosts\r\n<\/code><\/pre>\n<\/div>\n<p>Es sollte ungef\u00e4hr so aussehen:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>127.0.1.1 servername.fqdn.tld servername\r\n127.0.0.1 localhost\r\n::1 ip6-localhost ip6-loopback servername.fqdn.tld servername\r\nfe00::0 ip6-localnet\r\nff00::0 ip6-mcastprefix\r\nff02::1 ip6-allnodes\r\nff02::2 ip6-allrouters\r\nff02::3 ip6-allhosts<\/code><\/pre>\n<\/div>\n<p>Hier k\u00f6nnen Sie sehen, wo der Hostname festgelegt ist, und ihn einfach in den gew\u00fcnschten Namen \u00e4ndern.<\/p>\n<p>Nach dem Speichern der \u00c4nderungen muss der SSH-Dienst neu gestartet werden:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo systemctl restart ssh\r\n<\/code><\/pre>\n<\/div>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">Ergebnis<\/h2>\n<p>Sie haben Ihren Server-Hostnamen erfolgreich \u00fcberpr\u00fcft und ge\u00e4ndert.<\/p>","protected":false},"excerpt":{"rendered":"Einleitung Der Hostname eines Linux-Systems ist ein wichtiger Bestandteil des Systems. Man kann ihn nicht einfach so verwenden\u2026","protected":false},"author":1,"featured_media":16005,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u0646\u0627\u0645 \u0645\u06cc\u0632\u0628\u0627\u0646 \u0631\u0627 \u062f\u0631 \u062f\u0628\u06cc\u0627\u0646 \u0628\u0631\u0631\u0633\u06cc \u0648 \u062a\u063a\u06cc\u06cc\u0631 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