一.初始化Mariadb数据库

1.安装Mariadb

yum install mariadb mariadb-server

2.启动Mariadb

systemctl start mariadb
systemctl restart mariadb

3.初始化数据库

mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
   ``SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!
 
In order to log into MariaDB to secure it, we'll need the current
password ``for` `the root user. If you've just installed MariaDB, and
you haven't ``set` `the root password yet, the password will be blank,
so you should just press enter here.
 
Enter current password ``for` `root (enter ``for` `none): ``#当前数据库密码空的，直接回车
OK, successfully used password, moving on...
 
Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisa