Dynamic DNS is a method of automatically updating a name server in the Domain Name System, often in real-time, with the active DDNS configuration of its configured hostnames, addresses, or other information. (From Wikipedia)

This experience only applies to Alibaba Cloud China. It will not be the same as Alibaba Cloud International.
  1. Log in to the Alibaba Cloud, then find AccessKey Management

AccessKey Management

  1. You can use admin AccessKey (All Privileges). In this case, we will use a user AccessKey for safety reasons.

user AccessKey

  1. Create a new user, then fill out the login name and display name

create a new user

  1. Add AliyunDNSFullAccess Privilege to the user we just created

AccessKey管理

  1. Create an AccessKey

参考

Dynamic DNS Wikipedia

OpenWrt配置阿里云动态域名服务DDNS_Jair's Technical Blog-程序员秘密