Add resolution record
Updated at：2025-11-11
Record type description
Local DNS service supports the following types of resolution records in the table:
| Record type | Host record format | Record value format |
|---|---|---|
| Record A | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | Value of A record: IPv4 address, e.g., 192.168.2.56 |
| AAAA record | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | Value of AAAA record: IPv6 address, e.g., 1::1 |
| CNAME record | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | CNAME record value: Another domain name. The value must be a domain name (e.g., www.test.com). |
| MX record | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | Value range of TXT: Length must be less than 512, the TXT value must be in string format and can only contain English letters, numbers, or ?-~=:;.@+^/!” |
| TXT record | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | Value of MX record: Domain name of the mail server. Priority can be assigned to different mail servers with values ranging from 0 to 50, where smaller values represent higher priority. The MX record value must be a domain name (e.g., www.test.com). |
| SRV record | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | SRV record format: Priority Weight Port Target-address, with each item separated by spaces. Example: 0 6 8080 vipserver.test.com. |
PTR records are visible only in private zones with suffixes in-addr.arpa (IPv4) or ip6.arpa (IPv6, currently unsupported).
| Record type | Host record format | Record value format |
|---|---|---|
| PTR record | Valid characters for host records include a-z, A-Z, 0-9, '-', '.', '', and '@' | PTR record value: A domain name. The PTR record must contain a valid domain name (e.g., www.test.com). |
Custom resolution records
- On the Intelligent Cloud DNS Local DNS Service page, choose the added private zone and click on Resolution Settings to access the Resolution Settings page.
- Go to the Resolution Settings tab, then click on Add Resolution to create resolution records for the private zone.
- Fill in the following configuration information:
| ConfigMap | Description |
|---|---|
| Record type | Supports A records, AAAA records, CNAME records, MX records, TXT records, SRV records, and PTR records |
| Host record | String containing uppercase/lowercase letters, numbers, "@", and "-" |
| Record value | Value range for A records: IPv4 address in dotted-decimal format. Value range for AAAA records: IPv6 address. |
| TTL | TTL (Time To Live) represents the lifespan of cached data, indicating the duration for which local DNS caches the domain name records. Upon cache expiration, it retrieves record values from the authoritative DNS again. The default value is 60 seconds. |
- After completing the configuration, click OK to finalize the addition of resolution records.
Description:
- If a private zone is associated with a VPC, its resolution records will take precedence over corresponding public resolution records.
- The deletion of resolution records could impact services. Please proceed cautiously. Users may backup records using the download resolution records feature.
Synchronize public Service Records
Synchronizing public service records involves automatically fetching hostname configurations from public service instances like RDS and SCS through the private DNS service, and then generating corresponding private DNS resolution records based on those hostnames.
Description:
- Supported public services include Baidu AI Cloud Object Storage (BOS), Simple Cache Service (SCS), Relational Database Service (RDS), Gaia Database (GaiaDB), Cloud File System (CFS), and Baidu Storage Gateway (BSG).
Operation step
- On the Intelligent Cloud DNS Intranet DNS Service page, choose the added private zone and click on Resolution Settings to access the Resolution Settings page.
- Go to the Public Service Records tab, which allows manual and automatic synchronization of public service records.
- Click the Add Instance button, and a pop-up will appear. Select the VPC where the public service instance exists, click OK, and the system will automatically retrieve the public service instance name and intranet address within the selected VPC, creating corresponding DNS records.
- Click the Auto-Sync Configuration button, then select the VPC containing the public service instance. Once enabled, the system will automatically read public service information (e.g., RDS, SCS) within the selected VPC every 5 minutes and update the DNS records.