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Notify secondaries immediately on primary zone changes

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Dynamically-updated primary zones were only reaching the secondary pods on
the hardcoded 1h SOA refresh: the operator emitted no NOTIFY, and a zone's
only apex NS is the primary itself, so default 'notify yes' reached no one.
Queries load-balanced across the serve VIP hit stale secondaries and
returned NXDOMAIN (negatively cached downstream for the 300s SOA minimum),
so records flapped for up to an hour after every update.

Add 'notify explicit' + 'also-notify' with the secondary pod IPs to primary
zone stanzas so an update NOTIFYs the secondaries for an immediate IXFR.
Applied via modzone, so existing zones pick it up on the next reconcile.
Also shorten the seed SOA refresh/retry/minimum as a fallback for missed
NOTIFYs and to shrink stale-NXDOMAIN negative caching.
This commit is contained in:
Ben Vincent
2026-07-21 00:08:00 +10:00
parent e4ed9cfdb2
commit d5e08607c1
4 changed files with 102 additions and 5 deletions
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internal/controller/bindzone_controller.go
+16 -2
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@@ -80,7 +80,15 @@ func (r *BindZoneReconciler) Reconcile(ctx context.Context, req ctrl.Request) (c
return r.setPhase(ctx, &zone, "Pending", "PrimaryNotReady", "waiting for cluster primary to be ready")
}
zoneConfig, err := r.buildZoneConfig(ctx, &zone, r.zoneTransferKeyRef(ctx, &zone, cluster))
// Primary zones replicated to secondaries (catalog members) get an
// also-notify pointing at the secondary pods, so a dynamic update NOTIFYs
// them immediately rather than waiting for the SOA refresh.
var notifyTargets []string
if isPrimaryType(zone.Spec.Type) && catalogEnabled(&zone) {
notifyTargets = secondaryPodIPs(ctx, r.Client, cluster)
}
zoneConfig, err := r.buildZoneConfig(ctx, &zone, r.zoneTransferKeyRef(ctx, &zone, cluster), notifyTargets)
if err != nil {
return r.setPhase(ctx, &zone, "Error", "ConfigError", err.Error())
}
@@ -135,7 +143,7 @@ func (r *BindZoneReconciler) Reconcile(ctx context.Context, req ctrl.Request) (c
// buildZoneConfig renders the inner clause passed to rndc addzone/modzone.
// transferKey, when set, is the catalog transfer TSIG key name; catalog member
// primary zones must allow AXFR with it so secondaries can pull them.
func (r *BindZoneReconciler) buildZoneConfig(ctx context.Context, zone *bindv1alpha1.BindZone, transferKey string) (string, error) {
func (r *BindZoneReconciler) buildZoneConfig(ctx context.Context, zone *bindv1alpha1.BindZone, transferKey string, notifyTargets []string) (string, error) {
zType := zone.Spec.Type
if zType == "" {
zType = bindv1alpha1.ZonePrimary
@@ -154,6 +162,12 @@ func (r *BindZoneReconciler) buildZoneConfig(ctx context.Context, zone *bindv1al
// Catalog member: permit key-authenticated AXFR from secondaries.
parts = append(parts, fmt.Sprintf("allow-transfer { key \"%s\"; }", transferKey))
}
// NOTIFY only the secondaries we know about (their apex NS is the primary
// itself, so default `notify yes` would reach no one). `notify explicit`
// keeps NOTIFY off the query-serving VIP and scoped to the pod IPs.
if len(notifyTargets) > 0 {
parts = append(parts, "notify explicit", fmt.Sprintf("also-notify { %s }", terminateInline(notifyTargets)))
}
if zone.Spec.DNSSECPolicyRef != "" {
parts = append(parts, fmt.Sprintf("dnssec-policy \"%s\"", zone.Spec.DNSSECPolicyRef), "inline-signing yes")
}