1. wget https://dev.mysql.com/get/mysql80-community-release-el8-1.noarch.rpm 安裝Yum Repository
2.for i in $(rpm -qa|grep mysql);do rpm -e $i --nodeps;done 查看是否已經安裝過mysql
3.更新 yum update
4.yum install mysql-server ,安裝完后會出現 complete！
5. ps -ef | grep mysql，查看是否安裝成功
6.登陸Mysql
mysql -uroot -p
7.選擇 mysql 數據庫
use mysql;
8.查看mysql的運行狀態 systemctl status mysqld.service
啟動mysql systemctl start mysqld.service
重新啟動mysql systemctl restart mysqld.service