Configuration Guide for Adding a Website to Cloud WAF

Schematic Diagram

Figure 1 No proxy used

Prerequisites

• Website domain names are available.
• WAF has been purchased.
• The website information (such as the IP address and port number of the origin server) has been added to WAF.
• The account to update the DNS configuration is available.
• (Optional) You have whitelisted WAF back-to-source IP addresses. If other security software is used on the origin server, whitelist the WAF back-to-source IP addresses to prevent normal traffic from being blocked. For details, see Configuring an Access Control Policy on an ECS or ELB to Protect Origin Servers.
• (Optional) You have tested WAF before changing DNS settings. This can prevent service interruption due to incorrect configurations. For details, see Testing WAF.

Scenario

• If the Type of the domain name host record added on DNS is CNAME - Map one domain to another, complete the configuration based on the instructions in CNAME Access.

For details, see Record Set Types and Configuration Rules.

CNAME Access

If the Type of the domain name host record added on DNS is CNAME - Map one domain to another, add the domain name to WAF by following the steps below.

The methods to change DNS records on different DNS platforms are similar. The following example is based on our Domain Name Service (DNS).

1. Obtain the CNAME record.
   1. Click in the upper left corner of the management console and select a region or project.
   2. Click in the upper left corner and choose Web Application Firewall under Security & Compliance.
   3. In the navigation pane, choose Website Settings.
   4. In the Domain Name column, click the target domain name to go to the Basic Information page.
      Figure 2 Basic Information
      
   5. In the CNAME row, click to copy the CNAME record.

2. Change the DNS settings.
   1. Access the DNS resolution page, as shown in Figure 3.
      Figure 3 DNS page
      
   2. In the Operation column of the target domain name, click Modify. The Modify Record Set page is displayed.
   3. In the displayed Modify Record Set dialog box, change the record.
      • Name: Domain name configured in WAF
      • Type: Select CNAME - Map one domain to another.
      • Line: Default
      • TTL (s): The recommended value is 5 min. A larger TTL value will make it slower for synchronization and update of DNS records.
      • Value: Change it to the copied CNAME value from WAF.
      • Keep other settings unchanged.
      

      About modifying the resolution record:

      • The CNAME record must be unique for the same host record. The existing CNAME record must be changed to the WAF CNAME record.
      • Record sets of different types in the same zone may conflict with each other. For example, for the same host record, the CNAME record conflicts with another record, such as the A record, MX record, or TXT record. If the record type cannot be changed, you can delete the conflicting records and add a CNAME record. Deleting other records and adding a CNAME record should be completed in as short time as possible. If no CNAME record is added after the A record is deleted, domain resolution may fail.

      For details about the restrictions on domain name resolution types, see Why Is a Message Indicating Conflict with an Existing Record Set Displayed When I Add a Record Set?

      Figure 4 Modifying a record set
      
   4. Click OK.

3. (Optional) Ping the IP address of your domain name to check whether the new DNS settings take effect.
   

   It takes some time for the new DNS settings to take effect. If ping fails, wait for 5 minutes and ping again.