How Is CNAME-based Access Implemented?

What is a CNAME record?

A Canonical Name (CNAME) record is a type of DNS record that maps an alias name to a true or canonical domain name. A DNS A record maps a domain name to an IP address, whereas a CNAME record maps a domain name to another domain name (alias of that domain name). For example, CNAME ccd01c25c8535fa4.huaweisafedns.com is configured for domain name www.abc.com. When a user accesses www.abc.com, the DNS protocol automatically obtains its CNAME alias ccd01c25c8535fa4.huaweisafedns.com and uses the alias to obtain the real IP address.

What are the advantages of CNAME-based access?

• Easy to Use

  You only need to modify the resolution configuration with the DNS service provider (for example, DNS on HUAWEI CLOUD).

  The CNAME records generated in multiple lines for the same domain name are the same. You only need to configure one CNAME resolution record. Then AAD automatically configures the CNAME record for multiple high-defense IP addresses used by the domain name. When the high-defense IP address is changed, AAD updates CNAME mapping automatically, without requiring any manual DNS configuration modification.

• Excellent access performance

  If multiple lines are configured for a domain name, AAD can schedule access traffic based on the traffic source and select the optimal line to ensure the best access performance.

• High reliability

  You can select multiple lines for one domain name. If the high-defense IP address of a line encounters an exception, AAD automatically switches CNAME resolution to other available lines, ensuring service continuity.

What will I configure for CNAME-based access further if I have configured line-based resolution?

Generally, the CNAME resolution for one default line is required to replace line-based resolution. HUAWEI CLOUD will complete the resolution automatically.

The CNAME records provided by HUAWEI CLOUD are capable of line-based resolution. Based on the lines you purchased, HUAWEI CLOUD will perform line-based resolution automatically.