Not able to change DNS service entry for domain change.

[Ajaykums]

I tried running the below command :

vserver services name-service dns modify -vserver SVM -domains FQDN -name-servers SERVER-IP

But received an error as a duplicate entry, please suggest how to proceed further, thank you. 

[Ontapforrum]

Please check this kb:
Modifying CIFS server domain fails with error "Reason: Failed to create a domain entry for "DOMAIN". Reason: duplicate entry."
https://kb.netapp.com/onprem/ontap/da/NAS/Modifying_CIFS_server_domain_fails_with_error_%22Reason%3A_Failed_to_create_a_domain_entry_for_%22DOMAIN%22....

Also, check this:
https://mysupport.netapp.com/site/bugs-online/product/ONTAP/BURT/649007

[Ajaykums]

Thank you for a response here I have referred the same KB mentioned.

Gone through that KB which you shared. In work around it is mentioned Delete CIFS server and clean up all the stale local user and group entries for the vserver and re-create CIFS server with new domain.

[Ajaykums]

since it is in production. Please suggest if there  is  alternate option without impacting the production, thank you.

[Ontapforrum · Accepted solution]

If it's Production Server, then it has to be done with all considerations. Please don't delete it. 

Query: Are you trying to update the DNS entries for the existing DOMAIN, or simply change the DOMAIN itself ?

How to validate and update Vserver DNS servers in ONTAP: (Try this command - "vserver services dns modify")
https://kb.netapp.com/onprem/ontap/da/NAS/How_to_validate_and_update_Vserver_DNS_servers_in_ONTAP

[Ajaykums]

in this production I was trying to update a domain using create command instead of modify eg below:

[Ajaykums]

It was throwing error duplicate entry.

Just wanted to know if i modify domain using below command :
vserver services name-service dns  modify -vserver <vserver> -domain <domain_name> -name-servers <DNS_server_IP>,<DNS_server_IP>,<DNS_server_IP>

will above command to change domain name will be disruptive.

Thank you for KB article and explanation.

[Ontapforrum]

Yes, indeed. Updating DNS addresses is one thing but changing DOMAIN will require closing down the CIFS Service.

What is the impact of modifying the domain of a CIFS server?
Modifying the domain of the CIFS server requires that the CIFS service on the SVM be set to administratively down (closing all CIFS connections)

KBs:
https://kb.netapp.com/onprem/ontap/da/NAS/What_is_the_impact_of_modifying_or_deleting_or_recreating_a_cifs_server_on_ONTAP
https://docs.netapp.com/us-en/ontap-cli-96/vserver-cifs-modify.html#examples