12月個人指標

創建一個 MariaDB 數據庫，名爲 Contacts，並符合以下條件：  數據庫只能被 localhost 訪問  除了 root 用戶，此數據庫只能被用戶 Raikon 查詢，此用戶密碼爲 atenorth  root 用戶的密碼爲 atenorth，同時不允許空密碼登陸
1）安裝、配置
[root@localhost ~]# yum -y install mariadb-server mariadb
[root@localhost ~]# vim /etc/my.cnf
[mysqld]
skip-networking //添加此行，跳過網絡
[root@localhost ~]# systemctl restart mariadb
[root@localhost ~]# systemctl enable mariadb
2）設密碼、建庫
[root@localhost ~]# mysqladmin -u root -p password 'atenorth' //設置密碼
[root@localhost ~]# mysql -u root -p
MariaDB [(none)]> create database Contacts;
MariaDB [(none)]> grant select on Contacts. to Raikon@localhost identified by 'atenorth';
MariaDB [(none)]> delete from mysql.user where Password=''; //刪除空密碼賬號
MariaDB [(none)]> QUIT