From fdbaef499a2ba80d521e8e5393c0b4a703dc966a Mon Sep 17 00:00:00 2001
From: Jeffrey Egeland <jegeland@knackworks.com>
Date: Wed, 23 Jun 2021 16:34:04 -0400
Subject: [PATCH] rfc2136: add config validation for batch size

---
 pkg/apis/externaldns/validation/validation.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/apis/externaldns/validation/validation.go b/pkg/apis/externaldns/validation/validation.go
index 3251a7b09..b93b84aad 100644
--- a/pkg/apis/externaldns/validation/validation.go
+++ b/pkg/apis/externaldns/validation/validation.go
@@ -96,6 +96,10 @@ func ValidateConfig(cfg *externaldns.Config) error {
 				return errors.New("--rfc2136-kerberos-realm, --rfc2136-kerberos-username, and --rfc2136-kerberos-password are required when specifying --rfc2136-gss-tsig option")
 			}
 		}
+
+		if cfg.RFC2136BatchChangeSize < 1 {
+			return errors.New("Batch Size specified for rfc2136 cannot be less than 1")
+		}
 	}
 
 	if cfg.IgnoreHostnameAnnotation && cfg.FQDNTemplate == "" {