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, 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
   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.	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 of a record set. The value ranges from 0 to 1000, and the default value is 1. This parameter is only designated 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
   Description	(Optional) Supplementary information about the record set. You can enter a maximum of 255 characters.	This is a wildcard DNS record set.

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

   You can view the wildcard DNS record set in the Normal state.