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118 lines
5.1 KiB
Markdown
118 lines
5.1 KiB
Markdown
---
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title: DNS zone configuration
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template: docs
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taxonomy:
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category: docs
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routes:
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default: '/dns_config'
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aliases:
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- '/dns'
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---
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DNS (domain name system) is a system that converts human-readable addresses
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(domain names) into machine-understandable addresses (IP). For your server to be
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easily accessible by human beings, and for some services like mail to work
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properly, DNS must be configured.
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If you're using an [automatic domain](/dns_nohost_me) provided by the YunoHost Project, the configuration should be
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performed automatically. If you're using your own domain name (e.g. bought via
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a registrar), you should manually configure your domain on your registrar's
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interface.
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## Recommended DNS configuration
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NB: Examples here use the placeholder `your.domain.tld`, you have to replace it with your real domain, such as `www.yunohost.org`.
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YunoHost provides a recommended DNS configuration, available via:
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- the webadmin, in Domain > your.domain.tld > DNS configuration;
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- or the command line, `yunohost domain dns-conf your.domain.tld`
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For specific needs or specific setups, and if you know what you're doing, you
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might want or have to tweak these, or add additional ones (e.g. to handle
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subdomains).
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The recommended configuration typically looks like this:
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```bash
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#
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# Basic ipv4/ipv6 records
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#
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@ 3600 IN A 111.222.33.44
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* 3600 IN A 111.222.33.44
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# (If your server is IPv6 capable, there are some AAAA records)
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@ 3600 IN AAAA 2222:444:8888:3333:bbbb:5555:3333:1111
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* 3600 IN AAAA 2222:444:8888:3333:bbbb:5555:3333:1111
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#
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# XMPP
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#
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_xmpp-client._tcp 3600 IN SRV 0 5 5222 your.domain.tld.
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_xmpp-server._tcp 3600 IN SRV 0 5 5269 your.domain.tld.
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muc 3600 IN CNAME @
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pubsub 3600 IN CNAME @
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vjud 3600 IN CNAME @
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xmpp-upload 3600 IN CNAME @
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#
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# Mail (MX, SPF, DKIM and DMARC)
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#
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@ 3600 IN MX 10 your.domain.tld.
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@ 3600 IN TXT "v=spf1 a mx -all"
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mail._domainkey 3600 IN TXT "v=DKIM1; k=rsa; p=someHuuuuuuugeKey"
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_dmarc 3600 IN TXT "v=DMARC1; p=none"
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```
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Though it might be easier to understand it if displayed like this:
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| Type | Name | Value |
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| :-----: | :--------------------: | :--------------------------------------------------: |
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| **A** | **@** | `111.222.333.444` (your IPv4) |
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| A | * | `111.222.333.444` (your IPv4) |
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| AAAA | @ | `2222:444:8888:3333:bbbb:5555:3333:1111` (your IPv6) |
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| AAAA | * | `2222:444:8888:3333:bbbb:5555:3333:1111` (your IPv6) |
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| **SRV** | **_xmpp-client._tcp** | `0 5 5222 your.domain.tld.` |
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| **SRV** | **_xmpp-server._tcp** | `0 5 5269 your.domain.tld.` |
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| CNAME | muc | `@` |
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| CNAME | pubsub | `@` |
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| CNAME | vjud | `@` |
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| CNAME | xmpp-upload | `@` |
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| **MX** | **@** | `your.domain.tld.` (and priority: 10) |
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| TXT | @ | `"v=spf1 a mx -all"` |
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| TXT | mail._domainkey | `"v=DKIM1; k=rsa; p=someHuuuuuuugeKey"` |
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| TXT | _dmarc | `"v=DMARC1; p=none"` |
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### A few notes about this table
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- Not all these lines are absolutely necessary. For a minimal setup, you only need the records in bold.
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- The dot at the end of `your.domain.tld.` is important ;);
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- `@` corresponds to `your.domain.tld`, and e.g. `muc` corresponds to `muc.your.domain.tld`;
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- These are example values ! See your generated conf for the actual values you should use;
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- We recommend a [TTL](https://en.wikipedia.org/wiki/Time_to_live#DNS_records) of 3600 (1 hour). But you can use something else if you know what you're doing;
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- Don't put an IPv6 record if you're not sure IPv6 really works on your server! You might have issues with Let's Encrypt if it doesn't.
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- If you're using the domain provider Namecheap the SRV DNS entries are formatted as **Service**: `_xmpp-client` **Protocol**: `_tcp` **Priority**: `0` **Weight**: `5` **Port**: `5222` **Target**: `your.domain.tld`
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### Reverse DNS
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If your ISP or VPS provider let you define a [Reverse DNS
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lookup](https://en.wikipedia.org/wiki/Reverse_DNS_lookup) for your public IPv4
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and/or IPv6 addresses, you must configure it. It will prevent you to be marked as
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spam by anti-spam filters.
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**N.B. : the reverse DNS configuration happens on your Internet Service Provider or VPS provider. It is *not* handled by your domain's registrar.**
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If your public IPv4 address is `111.222.333.444` and your DNS
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domain is `domain.tld`, you should get following answer when using `nslookup`
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command tool:
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```bash
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nslookup 111.222.333.444
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444.333.222.111.in-addr.arpa name = domain.tld.
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```
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The diagnosis system available in the webadmin performs this checks automatically (in section Email).
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### Dynamic IP
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If your global IP address is constantly changing, follow this [tutorial](/dns_dynamicip).
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