1、添加mariabd yum源
vi /etc/yum.repos.d/mariadb.repo

[mariadb]
name = MariaDB
baseurl = https://mirrors.tuna.tsinghua.edu.cn/mariadb/yum/10.5/centos7-amd64/
gpgkey =  https://mirrors.tuna.tsinghua.edu.cn/mariadb/yum/RPM-GPG-KEY-MariaDB
gpgcheck = 1

2、建立yum源缓存

yum clean all
yum makecache

3、安装

yum install -y mariadb mariadb-server

4、启动

systemctl start mariadb

5、设置开机自启

systemctl enable mariadb

6、修改root密码

mysqladmin -u root -p password root

7、验证