Alibaba Cloud DNS:Basic configuration

What is basic configuration

The basic information configuration of a global traffic management instance includes: Instance Name, CNAME Access Domain, Business Domain, Global TTL, Alert Notification Group, and Alert Notification Method.

Configuration method

1. Access Cloud DNS-Global Traffic Management.

2. Go to the instance list page of global traffic management, click the Operation column of the target instance, and click the Configure button to enter the Basic Configuration page.

3. On the Basic Configuration tab, click the Modify button, and a dialog box for Modify Basic Configuration will appear on the right.

4. In the Modify Basic Configuration dialog box, you can edit the Instance Name, CNAME Access Domain, Business Domain, Global TTL, Alert Notification Group, and Alert Notification Method.

   

Parameters

1. Instance name

   The instance name is an identifier that users enter and define for easy memory and identification of the application service under the instance. You can edit the instance name on the Basic configuration tab.

2. Business domain

   The business domain is the domain name that users use to access the application service. This field is optional.

   Important

   You need to create a CNAME record in Cloud DNS to point the business domain to the CNAME access domain provided by GTM to achieve the traffic routing effect.

3. Custom access domain

   This is the CNAME domain used for traffic management access. You need to create a CNAME record in your DNS settings to point the business domain to this access domain. To set a custom CNAME access domain: Select a public domain name that is already using Alibaba Cloud DNS under your account as the suffix for the CNAME access domain. You can follow these steps:

   
   Important

   1. If your domain resolution service is not on Alibaba Cloud, you can migrate your domain resolution to Alibaba Cloud.

   2. If you cannot migrate your domain resolution to Alibaba Cloud temporarily, you can use independent subdomain hosting to authorize the subdomain to Alibaba Cloud resolution through NS records, and then generate a CNAME access domain using the custom method.

      Example: If the hosted subdomain is www.example.com, and the access domain prefix is set to gtm, then the custom access domain is gtm.www.example.com.

   3. The minimum value of global TTL is affected by the minimum TTL value that can be set by the corresponding package version of the custom CNAME access domain in Cloud DNS. It is recommended to attach the CNAME access domain to a Cloud DNS Standard or Ultimate Edition instance.

   4. The resolution request source can only select one type from "Carriers" or "Mainland China Regions". Mixed use is not supported.

   Note

   • Combined with access strategy configuration and health check status, the Cloud DNS Domain Names list will generate resolution records from the custom domain to the effective IP address.

   • In GTM 3.0 version, corresponding resolution records are no longer generated. The graphical interface can intuitively show the corresponding effective strategies.

4. Global TTL

   GTM provides traffic management services in the form of domain names. The cache effective time of domain name corresponding IP address information in the carrier's DNS system is the global TTL configuration. The Standard Edition supports a minimum TTL time of 1 minute, while the Ultimate Edition supports a minimum TTL time of 1 second.

   Important

   The global TTL is limited by the minimum TTL value supported by the Cloud DNS version of the custom domain, taking the larger of the two values:

   • For example, if GTM Ultimate Edition supports a minimum TTL value of 1s, and the Cloud DNS version of the suffix domain of the GTM access domain supports a minimum TTL value of 60s, then the minimum global TTL value can be set to 60s.

   • For example, if GTM Standard Edition supports a minimum TTL value of 60s, and the Cloud DNS version of the suffix domain of the GTM access domain supports a minimum TTL value of 1s, then the minimum global TTL value can be set to 60s.

5. Alert notification group

   The alert notification group refers to the contact group that receives notification messages when business anomalies occur. It reads the alert notification groups you set in Alibaba Cloud's CloudMonitor product. For configuration methods, see Create an alert contact or alert contact group. If GTM's health check detects abnormal IP addresses or unavailable IPAM pools, it will promptly notify your relevant contacts through the alert notification group.

   Note

   Currently, GTM provides alert notification method settings to meet users' customization needs for alert content and methods.

6. Modify

   After the global configuration of GTM is completed, if you need to modify information such as Instance Name, CNAME Access Domain, Business Domain, Global TTL, Alert Notification Group, you can click the Modify button to edit.