DNS (domain name system) is a system that converts human-readable addresses (domain names) into machine-understandable addresses (IP). For your server to be easily accessible by human beings, and for some services like mail to work properly, DNS must be configured.
If you're using an automatic domain provided by the YunoHost Project, the configuration should be performed automatically. If you're using your own domain name (e.g. bought via a registrar), you should manually configure your domain on your registrar's interface.
NB: Examples here use the placeholder
your.domain.tld, you have to replace it with your real domain, such as
YunoHost provides a recommended DNS configuration, available via:
yunohost domain dns-conf your.domain.tld
For specific needs or specific setups, and if you know what you're doing, you might want or have to tweak these, or add additional ones (e.g. to handle subdomains).
The recommended configuration typically looks like this:
# # Basic ipv4/ipv6 records # @ 3600 IN A 18.104.22.168 * 3600 IN A 22.214.171.124 # (If your server is IPv6 capable, there are some AAAA records) @ 3600 IN AAAA 2222:444:8888:3333:bbbb:5555:3333:1111 * 3600 IN AAAA 2222:444:8888:3333:bbbb:5555:3333:1111 # # XMPP # _xmpp-client._tcp 3600 IN SRV 0 5 5222 your.domain.tld. _xmpp-server._tcp 3600 IN SRV 0 5 5269 your.domain.tld. muc 3600 IN CNAME @ pubsub 3600 IN CNAME @ vjud 3600 IN CNAME @ xmpp-upload 3600 IN CNAME @ # # Mail (MX, SPF, DKIM and DMARC) # @ 3600 IN MX 10 your.domain.tld. @ 3600 IN TXT "v=spf1 a mx -all" mail._domainkey 3600 IN TXT "v=DKIM1; k=rsa; p=someHuuuuuuugeKey" _dmarc 3600 IN TXT "v=DMARC1; p=none"
Though it might be easier to understand it if displayed like this:
your.domain.tld.is important ;);
your.domain.tld, and e.g.
If your ISP or VPS provider let you define a Reverse DNS lookup for your public IPv4 and/or IPv6 addresses, you must configure it. It will prevent you to be marked as spam by anti-spam filters.
N.B. : the reverse DNS configuration happens on your Internet Service Provider or VPS provider. It is not handled by your domain's registrar.
If your public IPv4 address is
111.222.333.444 and your DNS
domain.tld, you should get following answer when using
$ nslookup 111.222.333.444 444.333.222.111.in-addr.arpa name = domain.tld.
The diagnosis system available in the webadmin performs this checks automatically (in section Email).
If your global IP address is constantly changing, follow this tutorial.
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