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fix: Reload dnsmasq instead of restart to avoid DNS downtime

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Use systemctl reload-or-restart instead of restart. dnsmasq supports
SIGHUP to reload config without dropping DNS service, preventing
transient DNS resolution failures during reconciliation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Paul Payne
2026-07-09 15:54:34 +00:00
parent ed0691d56f
commit 900d25bab2
1 changed files with 5 additions and 4 deletions
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9
internal/dnsmasq/config.go
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@@ -104,14 +104,15 @@ func (g *ConfigGenerator) WriteConfig(cfg *config.GlobalConfig, clouds []config.
return nil
}
// RestartService restarts the dnsmasq service
// RestartService reloads the dnsmasq service (SIGHUP — no downtime).
// Falls back to restart if reload fails.
func (g *ConfigGenerator) RestartService() error {
cmd := exec.Command("systemctl", "restart", "dnsmasq.service")
cmd := exec.Command("systemctl", "reload-or-restart", "dnsmasq.service")
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("failed to restart dnsmasq: %w (output: %s)", err, string(output))
return fmt.Errorf("failed to reload dnsmasq: %w (output: %s)", err, string(output))
}
slog.Info("dnsmasq service restarted", "component", "dnsmasq")
slog.Info("dnsmasq service reloaded", "component", "dnsmasq")
return nil
}