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<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<a href="https://github.com/mailcow/mailcow-dockerized-docs/edit/master/docs/prerequisite/prerequisite-system.de.md" title="Seite editieren" class="md-content__button md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
</a>
<h1>Systemvoraussetzungen</h1>
<p>Bevor Sie <strong>mailcow: dockerized</strong> ausfĂĽhren, sollten Sie einige Voraussetzungen ĂĽberprĂĽfen:</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Versuchen Sie <strong>nicht</strong>, mailcow auf einem Synology/QNAP-Gerät (jedes NAS), OpenVZ, LXC oder anderen Container-Plattformen zu installieren. KVM, ESX, Hyper-V und andere vollständige Virtualisierungsplattformen werden unterstützt.</p>
</div>
<div class="admonition info">
<p class="admonition-title">Info</p>
<ul>
<li>mailcow: dockerized erfordert, dass <a href="#standard-ports">einige Ports</a> fĂĽr eingehende Verbindungen offen sind, also stellen Sie sicher, dass Ihre Firewall diese nicht blockiert.</li>
<li>Stellen Sie sicher, dass keine andere Anwendung die Konfiguration von mailcow stört, wie z.B. ein anderer Maildienst</li>
<li>Ein korrektes DNS-Setup ist entscheidend fĂĽr jedes gute Mailserver-Setup, also stellen Sie bitte sicher, dass Sie zumindest die <a href="../prerequisite-dns/#die-minimale-dns-konfiguration">basics</a> abgedeckt haben, bevor Sie beginnen!</li>
<li>Stellen Sie sicher, dass Ihr System ein korrektes Datum und eine korrekte <a href="#datum-und-uhrzeit">Zeiteinstellung</a> hat. Dies ist entscheidend fĂĽr verschiedene Komponenten wie die Zwei-Faktor-TOTP-Authentifizierung.</li>
</ul>
</div>
<h2 id="minimale-systemressourcen">Minimale Systemressourcen<a class="headerlink" href="#minimale-systemressourcen" title="Permanent link">&para;</a></h2>
<p><strong>OpenVZ, Virtuozzo und LXC werden nicht unterstĂĽtzt</strong>.</p>
<p>Bitte stellen Sie sicher, dass Ihr System mindestens ĂĽber die folgenden Ressourcen verfĂĽgt:</p>
<table>
<thead>
<tr>
<th>Ressource</th>
<th>mailcow: dockerized</th>
</tr>
</thead>
<tbody>
<tr>
<td>CPU</td>
<td>1 GHz</td>
</tr>
<tr>
<td>RAM</td>
<td><strong>Minimum</strong> 6 GiB + 1 GiB Swap (Standardkonfiguration)</td>
</tr>
<tr>
<td>Festplatte</td>
<td>20 GiB (ohne Emails)</td>
</tr>
<tr>
<td>Systemtyp</td>
<td>x86_64</td>
</tr>
</tbody>
</table>
<p>Wir empfehlen, jede Distribution zu verwenden, die von Docker CE unterstĂĽtzt wird (siehe <a href="https://docs.docker.com/install/">https://docs.docker.com/install/</a>). Wir testen auf CentOS 7, Debian 10/11 und Ubuntu 18.04/20.04.</p>
<p>ClamAV und Solr können gierig nach RAM sein. Du kannst sie in <code>mailcow.conf</code> durch die Einstellungen <code>SKIP_CLAMD=y</code> und <code>SKIP_SOLR=y</code> deaktivieren.</p>
<p><strong>Info</strong>: Wir sind uns bewusst, dass ein reiner MTA auf 128 MiB RAM laufen kann. mailcow ist eine ausgewachsene und gebrauchsfertige Groupware mit vielen Extras, die das Leben einfacher machen. mailcow kommt mit einem Webserver, Webmailer, ActiveSync (MS), Antivirus, Antispam, Indexierung (Solr), Dokumentenscanner (Oletools), SQL (MariaDB), Cache (Redis), MDA, MTA, verschiedenen Webdiensten etc.</p>
<p>Ein einzelner SOGo-Worker <strong>kann</strong> ~350 MiB RAM belegen, bevor er geleert wird. Je mehr ActiveSync-Verbindungen Sie verwenden möchten, desto mehr RAM wird benötigt. In der Standardkonfiguration werden 20 Arbeiter erzeugt.</p>
<h4 id="beispiele-fur-die-verwendung">Beispiele fĂĽr die Verwendung<a class="headerlink" href="#beispiele-fur-die-verwendung" title="Permanent link">&para;</a></h4>
<p>Ein Unternehmen mit 15 Telefonen (EAS aktiviert) und etwa 50 gleichzeitigen IMAP-Verbindungen sollte 16 GiB RAM einplanen.</p>
<p>6 GiB RAM + 1 GiB Swap sind für die meisten privaten Installationen ausreichend, während 8 GiB RAM für ~5 bis 10 Benutzer empfohlen werden.</p>
<p>Im Rahmen unseres Supports können wir Ihnen bei der korrekten Planung Ihres Setups helfen.</p>
<h2 id="firewall-ports">Firewall &amp; Ports<a class="headerlink" href="#firewall-ports" title="Permanent link">&para;</a></h2>
<p>Bitte ĂĽberprĂĽfen Sie, ob alle Standard-Ports von mailcow offen sind und nicht von anderen Anwendungen genutzt werden:</p>
<div class="highlight"><pre><span></span><code>ss -tlpn | grep -E -w &#39;25|80|110|143|443|465|587|993|995|4190|5222|5269|5443&#39;
# oder:
netstat -tulpn | grep -E -w &#39;25|80|110|143|443|465|587|993|995|4190|5222|5269|5443&#39;
</code></pre></div>
<div class="admonition warnung">
<p class="admonition-title">Warnung</p>
<p>Es gibt einige Probleme mit dem Betrieb von mailcow auf einem Firewalld/ufw aktivierten System. Sie sollten es deaktivieren (wenn möglich) und stattdessen Ihren Regelsatz in die DOCKER-USER-Kette verschieben, die nicht durch einen Neustart des Docker-Dienstes gelöscht wird. Siehe <a href="https://blog.donnex.net/docker-and-iptables-filtering/">diese (blog.donnex.net)</a> oder <a href="https://unrouted.io/2017/08/15/docker-firewall/">diese (unrouted.io)</a> Anleitung für Informationen darüber, wie man iptables-persistent mit der DOCKER-USER Kette benutzt.
Da mailcow im Docker-Modus läuft, haben INPUT-Regeln keinen Effekt auf die Beschränkung des Zugriffs auf mailcow. Verwenden Sie stattdessen die FORWARD-Kette.</p>
</div>
<p>Wenn dieser Befehl irgendwelche Ergebnisse liefert, entfernen oder stoppen Sie bitte die Anwendung, die auf diesem Port läuft. Sie können mailcows Ports auch über die Konfigurationsdatei <code>mailcow.conf</code> anpassen.</p>
<h3 id="standard-ports">Standard Ports<a class="headerlink" href="#standard-ports" title="Permanent link">&para;</a></h3>
<p>Wenn Sie eine Firewall vor mailcow haben, stellen Sie bitte sicher, dass diese Ports fĂĽr eingehende Verbindungen offen sind:</p>
<table>
<thead>
<tr>
<th>Dienst</th>
<th align="center">Protokoll</th>
<th align="left">Port</th>
<th align="left">Container</th>
<th>Variable</th>
</tr>
</thead>
<tbody>
<tr>
<td>Postfix SMTP</td>
<td align="center">TCP</td>
<td align="left">25</td>
<td align="left">postfix-mailcow</td>
<td><code>${SMTP_PORT}</code></td>
</tr>
<tr>
<td>Postfix SMTPS</td>
<td align="center">TCP</td>
<td align="left">465</td>
<td align="left">postfix-mailcow</td>
<td><code>${SMTPS_PORT}</code></td>
</tr>
<tr>
<td>Postfix Einreichung</td>
<td align="center">TCP</td>
<td align="left">587</td>
<td align="left">postfix-mailcow</td>
<td><code>${SUBMISSION_PORT}</code></td>
</tr>
<tr>
<td>Dovecot IMAP</td>
<td align="center">TCP</td>
<td align="left">143</td>
<td align="left">dovecot-mailcow</td>
<td><code>${IMAP_PORT}</code></td>
</tr>
<tr>
<td>Dovecot IMAPS</td>
<td align="center">TCP</td>
<td align="left">993</td>
<td align="left">dovecot-mailcow</td>
<td><code>${IMAPS_PORT}</code></td>
</tr>
<tr>
<td>Dovecot POP3</td>
<td align="center">TCP</td>
<td align="left">110</td>
<td align="left">dovecot-mailcow</td>
<td><code>${POP_PORT}</code></td>
</tr>
<tr>
<td>Dovecot POP3S</td>
<td align="center">TCP</td>
<td align="left">995</td>
<td align="left">dovecot-mailcow</td>
<td><code>${POPS_PORT}</code></td>
</tr>
<tr>
<td>Dovecot ManageSieve</td>
<td align="center">TCP</td>
<td align="left">4190</td>
<td align="left">dovecot-mailcow</td>
<td><code>${SIEVE_PORT}</code></td>
</tr>
<tr>
<td>HTTP(S)</td>
<td align="center">TCP</td>
<td align="left">80/443</td>
<td align="left">nginx-mailcow</td>
<td><code>${HTTP_PORT}</code> / <code>${HTTPS_PORT}</code></td>
</tr>
</tbody>
</table>
<p>Um einen Dienst an eine IP-Adresse zu binden, können Sie die IP-Adresse wie folgt voranstellen: <code>SMTP_PORT=1.2.3.4:25</code></p>
<p><strong>Wichtig</strong>: Sie können keine IP:PORT-Bindungen in HTTP_PORT und HTTPS_PORT verwenden. Bitte verwenden Sie stattdessen <code>HTTP_PORT=1234</code> und <code>HTTP_BIND=1.2.3.4</code>.</p>
<h3 id="wichtig-fur-hetzner-firewalls">Wichtig fĂĽr Hetzner Firewalls<a class="headerlink" href="#wichtig-fur-hetzner-firewalls" title="Permanent link">&para;</a></h3>
<p>Ich zitiere <a href="https://github.com/chermsen">https://github.com/chermsen</a> ĂĽber <a href="https://github.com/mailcow/mailcow-dockerized/issues/497#issuecomment-469847380">https://github.com/mailcow/mailcow-dockerized/issues/497#issuecomment-469847380</a> (DANKE!):</p>
<p>Für alle, die mit der Hetzner-Firewall zu kämpfen haben:</p>
<p>Port 53 ist in diesem Fall fĂĽr die Firewall-Konfiguration unwichtig. Laut Dokumentation verwendet unbound den Portbereich 1024-65535 fĂĽr ausgehende Anfragen.
Da es sich bei der Hetzner Robot Firewall um eine statische Firewall handelt (jedes eingehende Paket wird isoliert geprĂĽft) - mĂĽssen die folgenden Regeln angewendet werden:</p>
<p><strong>FĂĽr TCP</strong>
<div class="highlight"><pre><span></span><code>SRC-IP: ---
DST-IP: ---
SRC-Port: ---
DST-Port: 1024-65535
Protokoll: tcp
TCP-Flags: ack
Aktion: Akzeptieren
</code></pre></div></p>
<p><strong>FĂĽr UDP</strong>
<div class="highlight"><pre><span></span><code>SRC-IP: ---
DST-IP: ---
SRC-Port: ---
DST-Port: 1024-65535
Protokoll: udp
Aktion: Akzeptieren
</code></pre></div></p>
<p>Wenn man einen restriktiveren Portbereich anwenden will, muss man zuerst die Konfiguration von unbound ändern (nach der Installation):</p>
<p>{mailcow-dockerized}/data/conf/unbound/unbound.conf:
<div class="highlight"><pre><span></span><code>ausgehender-Port-vermeiden: 0-32767
</code></pre></div></p>
<p>Nun können die Firewall-Regeln wie folgt angepasst werden:</p>
<div class="highlight"><pre><span></span><code>[...]
DST Port: 32768-65535
[...]
</code></pre></div>
<h2 id="datum-und-uhrzeit">Datum und Uhrzeit<a class="headerlink" href="#datum-und-uhrzeit" title="Permanent link">&para;</a></h2>
<p>Um sicherzustellen, dass Sie das richtige Datum und die richtige Zeit auf Ihrem System eingestellt haben, ĂĽberprĂĽfen Sie bitte die Ausgabe von <code>timedatectl status</code>:</p>
<div class="highlight"><pre><span></span><code>$ timedatectl status
Lokale Zeit: Sat 2017-05-06 02:12:33 CEST
Weltzeit: Sa 2017-05-06 00:12:33 UTC
RTC-Zeit: Sa 2017-05-06 00:12:32
Zeitzone: Europa/Berlin (MESZ, +0200)
NTP aktiviert: ja
NTP synchronisiert: ja
RTC in lokaler TZ: nein
Sommerzeit aktiv: ja
Letzte DST-Ă„nderung: Sommerzeit begann am
Sonne 2017-03-26 01:59:59 MEZ
So 2017-03-26 03:00:00 MESZ
Nächste Sommerzeitänderung: Die Sommerzeit endet (die Uhr springt eine Stunde rückwärts) am
Sun 2017-10-29 02:59:59 MESZ
Sun 2017-10-29 02:00:00 MEZ
</code></pre></div>
<p>Die Zeilen <code>NTP aktiviert: ja</code> und <code>NTP synchronisiert: ja</code> zeigen an, ob Sie NTP aktiviert haben und ob es synchronisiert ist.</p>
<p>Um NTP zu aktivieren, mĂĽssen Sie den Befehl <code>timedatectl set-ntp true</code> ausfĂĽhren. Sie mĂĽssen auch Ihre <code>/etc/systemd/timesyncd.conf</code> bearbeiten:</p>
<div class="highlight"><pre><span></span><code># vim /etc/systemd/timesyncd.conf
[Zeit]
NTP=0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org
</code></pre></div>
<h2 id="hetzner-cloud-und-wahrscheinlich-andere">Hetzner Cloud (und wahrscheinlich andere)<a class="headerlink" href="#hetzner-cloud-und-wahrscheinlich-andere" title="Permanent link">&para;</a></h2>
<p>Prüfen Sie <code>/etc/network/interfaces.d/50-cloud-init.cfg</code> und ändern Sie die IPv6-Schnittstelle von eth0:0 auf eth0:</p>
<div class="highlight"><pre><span></span><code># Falsch:
auto eth0:0
iface eth0:0 inet6 static
# Richtig:
auto eth0
iface eth0 inet6 statisch
</code></pre></div>
<p>Starten Sie die Schnittstelle neu oder starten Sie sie neu.
Vielleicht möchten Sie <a href="https://wiki.hetzner.de/index.php/Cloud_IP_static/en#disable_cloud-init_network_changes">cloud-init Netzwerkänderungen deaktivieren.</a></p>
<h2 id="mtu">MTU<a class="headerlink" href="#mtu" title="Permanent link">&para;</a></h2>
<p>Besonders relevant fĂĽr OpenStack-Benutzer: ĂśberprĂĽfen Sie Ihre MTU und setzen Sie sie entsprechend in docker-compose.yml. Siehe <strong>4.1</strong> in <a href="../../i_u_m/i_u_m_install/">unseren Installationsanleitungen</a>.</p>
<hr>
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_datetime">2022-01-30 14:54:10</span>
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