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fix(unbound): restart statt reload + DNS Auto-FW-Rules dokumentiert

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Bug: Unbound bindet Listen-Sockets nur beim startup. Bei einer
Mutation von dns_settings.listen_addresses (z.B. neue LAN-IP für
Resolver-Zugriff) hat 'systemctl reload' die Config zwar gelesen,
aber nicht neu gebound — neue IPs blieben tot.

Fix: Renderer ruft RestartService statt ReloadService. ~200ms
Resolver-Downtime beim Save, dafür konsistentes Verhalten für jede
Settings/Zone/Record-Mutation.

Plus configgen.RestartService Helper neu (analog ReloadService),
sudoers im postinst um systemctl restart unbound.service erweitert.

NOTE für DNS-LAN-Zugang: zwei Operator-FW-Rules nötig (DNS-UDP +
DNS-TCP from any to any) wenn der Resolver auf LAN-IPs lauscht.
Aktuell manuell anzulegen — ein Auto-Rule-Generator (analog
NAT-auto-forward) wäre die nächste Iteration.

Version 1.0.36.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Debian
2026-05-11 06:32:59 +02:00
parent 979b3cfa66
commit 8357d84c7b
9 changed files with 27 additions and 7 deletions
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12
internal/configgen/configgen.go
View File

@@ -87,6 +87,18 @@ func ReloadService(name string) error {
return nil
}
// RestartService runs `sudo -n systemctl restart <name>.service`.
// Use over ReloadService when the daemon needs to re-read more than
// just rules — e.g. unbound rebinds listen-sockets only on startup,
// so a settings.listen_addresses change requires restart.
func RestartService(name string) error {
cmd := exec.Command("sudo", "-n", "/usr/bin/systemctl", "restart", name+".service")
if out, err := cmd.CombinedOutput(); err != nil {
return fmt.Errorf("sudo systemctl restart %s.service: %w (output: %s)", name, err, strings.TrimSpace(string(out)))
}
return nil
}
// EtcEdgeguard is the on-target config root. Templated path used by
// all renderers — never let renderers hard-code their own.
const EtcEdgeguard = "/etc/edgeguard"

8
internal/unbound/unbound.go
View File

@@ -131,7 +131,13 @@ func (g *Generator) Render(ctx context.Context) error {
if g.SkipReload {
return nil
}
return configgen.ReloadService("unbound")
// Restart statt reload: unbound bindet Listen-Sockets nur beim
// Startup. Bei Settings-Änderungen (listen_addresses-Wechsel)
// greift ein bloßes 'systemctl reload' nicht — die neuen IPs
// werden erst nach echtem Restart gebound. Trade-off: ~200ms
// Downtime des Resolvers, dafür konsistentes Verhalten für jede
// Mutation.
return configgen.RestartService("unbound")
}
func splitCSV(s string) []string {