Creating a Wildcard DNS Record Set

Scenarios

A wildcard DNS record set is used to match requests for all subdomains in a zone. You can add a record whose name is an asterisk (*) to resolve requests to all subdomains of the domain name to the same value.

This section describes how to create a wildcard DNS record set.

Constraints

Wildcard DNS resolution does not support NS record sets.

Procedure

1. Log in to the management console.
2. In the service list, choose Network > Domain Name Service.

   The DNS console is displayed.

3. In the navigation pane, choose Private Zones.

   The zone list is displayed.

4. Click in the upper left corner and select the desired 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. Set the parameters based on Table 1.

   Table 1 Parameters for adding a wildcard DNS record set

   Parameter	Description	Example Value
   Name	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 record sets.	A – Map domains to IPv4 addresses
   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 is 300. If your service address changes frequently, set TTL to a smaller value.	The default value is 300, 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
   Tag	(Optional) Identifier of the record set. Each tag contains a key and a value. You can add a maximum of 10 tags to a record set. This parameter is displayed when you expand Other Settings. 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.	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.