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Restore support for "Override local DNS" (#2438)

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Tailscale allows to override the local DNS settings of a node via
"Override local DNS" [1]. Restore this flag with the same config setting
name `dns.override_local_dns` but disable it by default to align it with
Tailscale's default behaviour.

Tested with Tailscale 1.80.2 and systemd-resolved on Debian 12.

With `dns.override_local_dns: false`:

```
Link 12 (tailscale0)
Current Scopes: DNS
     Protocols: -DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 100.100.100.100
    DNS Domain: tn.example.com ~0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa [snip]
```

With `dns.override_local_dns: true`:

```
Link 12 (tailscale0)
Current Scopes: DNS
     Protocols: +DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 100.100.100.100
    DNS Domain: tn.example.com ~.
```

[1] https://tailscale.com/kb/1054/dns#override-local-dns

Fixes: #2256
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nblock 2025-04-17 17:16:59 +02:00 • committed by GitHub
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config-example.yaml
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@ -270,6 +270,10 @@ dns:
# `hostname.base_domain` (e.g., _myhost.example.com_).
base_domain: example.com
# Whether to use the local DNS settings of a node (default) or override the
# local DNS settings and force the use of Headscale's DNS configuration.
override_local_dns: false
# List of DNS servers to expose to clients.
nameservers:
global: