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.
  1. Click the name of the zone to which you want to add a wildcard DNS record set.
  2. Click Add Record Set.
  3. 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
  4. Click OK.
  5. Switch back to the Record Sets tab.

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

Parent topic: Record Sets