1.wget

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wget https://dev.mysql.com/get/mysql80-community-release-el7-11.noarch.rpm

2.rpm

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rpm -ivh mysql80-community-release-el7-11.noarch.rpm

3.yum.repos.d

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cd /etc/yum.repos.d/

ls and cat /etc/yum.repos.d/

发现mysql-community-debuginfo.repo

4.cache

yum clean all

yum makecache

5.yum install （默认安装mysql 8.0）

yum install -r mysql-server

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yum会自动删除mariadb的一些文件(会影响mysql正常运行)

6.启动mysql服务

systemctl start mysqld

7.查看mysql密码

grep "password" /var/log/mysqld.log

passw： #,Cgd4n?lrcr

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8.登录mysql，首次登录需要修改密码才能操作

login： mysql -uroot -p

passw： #,Cgd4n?lrcr

9.修改密码

set password for uname@localhost = password('new password');