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. 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 on the left, choose Private Zones.

   The zone list is displayed.

4. Click on the upper left 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. Configure 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 and SOA 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 value is 300. If your service address changes frequently, set TTL to a smaller value.	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
   Tag	(Optional) Identifier of the record set. Each tag contains a key and a value. You can add up to 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. 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

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

   The wildcard DNS record set in the Normal state.