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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
Integration testing
Headscale relies on integration testing to ensure we remain compatible with Tailscale.
This is typically performed by starting a Headscale server and running a test "scenario" with an array of Tailscale clients and versions.
Headscale's test framework and the current set of scenarios are defined in this directory.
Tests are located in files ending with _test.go and the framework are located in the rest.
Running integration tests locally
The easiest way to run tests locally is to use act, a local GitHub Actions runner:
act pull_request -W .github/workflows/test-integration.yaml
Alternatively, the docker run command in each GitHub workflow file can be used.
Running integration tests on GitHub Actions
Each test currently runs as a separate workflows in GitHub actions, to add new test, run
go generate inside ../cmd/gh-action-integration-generator/ and commit the result.