Adding an NS Record Set

Scenarios

If you want to specify authoritative DNS servers for a domain name, you can add NS record sets.

For more details, see Record Set Types and Configuration Rules.

Constraints

You can create NS record sets only in public zones.
After a public zone is created, the system automatically adds an NS record set for the domain name. This NS record set cannot be modified or deleted. Therefore, you can add NS record sets only in the following scenarios:
- The Name parameter is not left blank. This means that you can add NS record sets for subdomains of a domain name.
- The value of the Line parameter is not set to Default. This means that you can add NS record sets for the domain name with other resolution lines.

Procedure

Log in to the management console.
Hover the cursor over in the upper left corner. In the service list, choose Networking > Domain Name Service.
The DNS console is displayed.
In the navigation pane on the left, choose Public Zones.
The Public Zones page is displayed.
Click the domain name.
Click Add Record Set.
The Add Record Set dialog box is displayed.

Configure the parameters based on Table 1.

**Table 1** Parameters for adding an NS record set
Parameter	Description	Example Value
Name	Prefix of the domain name to be resolved. For example, if the domain name is example.com, the prefix can be as follows: www: The domain name is www.example.com, which is usually used for a website. Left blank: The domain name is example.com. In some cases, you may need to set the record set name to the at sign (@). However, the at sign is not supported. Leave the Name blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com, which is typically used for an email server. : The domain name is .example.com, which is a wildcard domain name, indicating all subdomains of example.com.	abc
Type	Type of the record set If a message is displayed indicating that the record set you are trying to create exists, the record set conflicts with an existing record set. For details, see Why Is a Message Indicating Conflict with an Existing Record Set Displayed When I Add a Record Set?	NS – Delegate subdomains to other name servers
Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where the visitors come from. This parameter is supported only for public domain names. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on visitors' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on visitors' geographical locations. For details, see Configuring Region Lines.	Default
TTL (s)	Cache duration of the record set on a local DNS server, in seconds. The value ranges from 300 to 2147483647, and the default is 300. If your service address changes frequently, set TTL to a smaller value. Learn more about TTL.	The default value is 300s, which is, 5 minutes.
Value	DNS server address You can enter a maximum of 50 record values, each on a separate line.	ns1.example.net ns2.example.net
Weight	(Optional) Weight of a record set. The value ranges from 0 to 1000, and the default value is 1. This parameter is supported only for public domain names. If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
Tag	(Optional) Identifier of the record set. This parameter is displayed when you expand More Settings. Each tag contains a key and a value. You can add a maximum of 10 tags to a record set. For details about tag key and value requirements, see Table 2.	example_key1 example_value1
Description	(Optional) Supplementary information about the record set. You can enter a maximum of 255 characters.	-

**Table 2** Tag key and value requirements
Parameter	Requirements	Example Value
Key	Cannot be left blank. Must be unique for each resource. Can contain a maximum of 36 characters. Cannot start or end with a space or contain special characters =*<>\,\|/	example_key1
Value	Cannot be left blank. Can contain a maximum of 43 characters. Cannot start or end with a space or contain special characters =*<>\,\|/	example_value1