Creating a Wildcard DNS Record Set

Scenarios

A wildcard record set with its name set to an asterisk (*) can map all subdomains of the domain name to the same value. During domain name resolution, fuzzy matching is used.

Exact matching has a higher priority than fuzzy matching.

Constraints

Wildcard DNS resolution does not support NS and SOA record sets.

Procedure

1. Log in to the management console.
2. Hover the cursor over in the upper left corner. In the service list, choose Networking > Domain Name Service.

   The DNS console is displayed.

3. In the navigation pane, choose Public Zones or Private Zones.

   The zone list is displayed.

4. (Optional) If you have selected Private Zones, click on the upper left corner to select the region and project.

5. Click the name of the zone to which you want to add a wildcard DNS record set.
6. Click Add Record Set.
7. Configure the parameters based on Table 1.

   Table 1 Parameters for adding a wildcard DNS record set

   Parameter	Description	Example Value
   Name	Public (or private) domain name Enter an asterisk (*) as the leftmost label of the domain name, for example, *.example.com. NOTE: Only the leftmost asterisk is considered as a wildcard character. Other asterisks in the domain name are common text characters.	*.abc
   Type	Record set type Wildcard DNS resolution does not support NS and SOA record sets.	A – Map domains to IPv4 addresses
   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	Record set value	Take an A record set for example, Value is set to IPv4 addresses mapped to the domain name. Example: 192.168.12.2 192.168.12.3
   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. This parameter is displayed when you expand More Settings. You can enter a maximum of 255 characters.	This is a wildcard DNS record set.

   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

8. Click OK.
9. Switch back to the Record Sets page.

   View the created wildcard DNS record set in the record set list of the domain name, and ensure that the status of the record set is Normal.

   How Do I Check Whether Record Sets Have Taken Effect?