1、解除安裝命令：# rpm -qa |grep -i mysql 

　　# yum remove mysql-community mysql-community-server mysql-community-libs mysql-community-common

2、安裝：# wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

　　# yum localinstall mysql57-community-release-el7-8.noarch.rpm

　　# yum install mysql-community-server

3、啟動 ：# systemctl start mysqld

　　重啟：# systemctl restart mysqld

　　關閉：# systemctl stop mysqld

　　設定開機自啟 # systemctl enable mysqld

　　　　　　　　 # systemctl daemon-reload

4、檢視預設密碼：# grep 'temporary password' /var/log/mysqld.log

　　注：可修改密碼策略（不然密碼需要包括大小寫、數字、特殊符號）

　　# vim  /etc/my.cnf

　　新增：validate_password = off

　　# systemctl restart mysqld

5、登入：#  mysql -uroot -p

　　修改密碼：mysql> set password for 'root'@'localhost'=password('123123'); 

　　新增遠端賬號：mysql> GRANT ALL PRIVILEGES ON *.* TO 'home'@'%' IDENTIFIED BY '123123' WITH GRANT OPTION;

7、配置預設編碼utf-8：# vim /etc/my.cnf

　　新增：   character_set_server=utf8

　　　　　　init_connect='SET NAMES utf8'

8、預設配置檔案路徑： 

　　配置檔案：/etc/my.cnf 

　　日誌檔案：/var/log//var/log/mysqld.log 

　　服務啟動指令碼：/usr/lib/systemd/system/mysqld.service 

　　socket檔案：/var/run/mysqld/mysqld.pid