vim /etc/yum.repos.d/MariaDB.repo 

[mariadb]
name = MariaDB
baseurl = https://mirrors.aliyun.com/mariadb/yum/10.6.18/centos7-amd64/
gpgkey =  http://mirrors.aliyun.com/mariadb/yum/RPM-GPG-KEY-MariaDB
gpgcheck = 1



yum clean all

yum makecache