You can create NS records with the help of CRD source
and DNSEndpoint
CRD.
Consider the following example
apiVersion: externaldns.k8s.io/v1alpha1
kind: DNSEndpoint
metadata:
name: ns-record
spec:
endpoints:
- dnsName: zone.example.com
recordTTL: 300
recordType: NS
targets:
- ns1.example.com
- ns2.example.com
After instantiation of this Custom Resource external-dns will create NS record with the help of configured provider, e.g. aws