CentOS移除以及安裝mysql-server

#yum remove mysql-server --->移除mysql-server #rm -rf /var/lib/mysql/ --->徹底清除相關目錄 #yum -y install mysql-server --->安裝 #service mysqld restart --->重啟服務 #mysqladmin -u root password 填新密碼 --->變更mysql的root的密碼