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.
Note
Exact match has a higher priority than fuzzy match.
Constraints¶
Wildcard DNS resolution does not support NS and SOA record sets.
Procedure¶
Log in to the management console.
In the service list, choose Network > Domain Name Service.
The DNS console is displayed.
In the navigation pane, choose Public Zones or Private Zones.
The zone list is displayed.
(Optional) If you have selected Private Zones, click
on the upper left corner to select the region and project.
Click the name of the zone to which you want to add a wildcard DNS record set.
Click Add Record Set.
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
Tag
(Optional) Identifier of a record set. Each tag contains a key and a value. You can add a maximum of 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.
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.
Can contain only letters, digits, hyphens (-), at signs (@), and underscores (_).
example_key1
Value
Cannot be left blank.
Can contain a maximum of 43 characters.
Can contain only letters, digits, hyphens (-), at signs (@), and underscores (_).
example_value1
Click OK.
Switch back to the Record Sets tab.
You can view the wildcard DNS record set in the Normal state.