Configuring 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 match is used.

Exact match has a higher priority than fuzzy match.

Constraints

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

Procedure

1. Go to the DNS console.
2. In the navigation pane on the left, choose Public Zones or Private Zones.

   The zone list is displayed.

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

4. Click the name of the zone to which you want to add a wildcard DNS record set.
5. Click Add Record Set.
6. 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 specific line, depending on where the visitors come from. This parameter is only configurable for public zone record sets. 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 1 to 2147483647, and the default value is 300. If your service address changes frequently, set TTL to a smaller value. Learn more about TTL.	300
   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 for the record set. The value ranges from 0 to 1000, and the default value is 1. This parameter is only configurable for public zone record sets. 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. Each tag contains a key and a value. You can add up to 20 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. The description can contain no more than 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 no more than 36 characters. Cannot start or end with a space nor contain special characters =*<>\,|/	example_key1
   Value	Cannot be left blank. Can contain no more than 43 characters. Cannot start or end with a space nor contain special characters =*<>\,|/	example_value1

7. Click OK.
8. Switch back to the Record Sets tab.

   The wildcard DNS record set in the Normal state.

   How Do I Check Whether a Record Set Has Taken Effect?