What Is DNS?

Updated on 2022-01-25 GMT+08:00

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Domain Name Service (DNS) route queries for private domain names to facilitate access to cloud resources within the VPCs.

With DNS, you can

Flexibly customize private domain names.
Associate one or more VPCs with a private zone.
Use private domain names to access ECSs as well as OBS and RDS resources in the VPCs more quickly, preventing DNS spoofing.

The DNS service provides the following functions:

Public domain name resolution
Translates private domain names into private IP addresses to facilitate access to cloud resources within VPCs.
Reverse resolution
Obtains a domain name based on an IP address. Reverse resolution, or reverse DNS lookup, is typically used to affirm the credibility of email servers.

The DNS service has the following advantages:

High performance
A single DNS node can handle millions of concurrent queries, allowing end users to access your website or application more quickly.
Easy access to cloud resources
Your ECSs can communicate with each other and with other resources within VPCs using private domain names. Traffic is kept within your internal network, which reduces network latency and improves security.
Isolation of core data
A private DNS server provides domain name resolution for ECSs carrying core data, enabling secure, controlled access to such data. You do not need to bind EIPs to these ECSs.

The cloud platform provides a web-based management console as well as REST APIs through which you can access the DNS service.

Management console
A web-based management console enables you to access the DNS service.

With a few steps, you can start using the DNS service for domain name resolution.
APIs
REST APIs are provided for accessing the DNS service. You can also use the provided APIs to integrate DNS into a third-party system for secondary development. For details, see the Domain Name Service API Reference.

Parent topic: Overview