参考：
https://blog.csdn.net/qq_39038465/article/details/81663540
https://blog.csdn.net/qq_41525746/article/details/109995429?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-0&spm=1001.2101.3001.4242
https://blog.csdn.net/huryer/article/details/106608119
https://www.jb51.net/article/186499.htm
https://blog.csdn.net/weixin_40780777/article/details/100553505
1、下载rpm包，安装Yum Repository
wget https://dev.mysql.com/get/mysql80-community-release-el8-1.noarch.rpm
2、使用rpm来安装MySQL
yum install mysql80-community-release-el8-1.noarch.rpm
3、使用yum安装mysql服务
yum repolist enabled | grep "mysql.*-community.*"
rpm -ivh mysql80-community-release-el8-1.noarch.rpm
4、查看mysql状态 systemctl list-unit-files|grep mysqld
systemctl enable mysqld.service
ps -ef|grep mysql
5、获取临时密码：grep 'temporary password' /var/log/mysql/mysqld.log
注意这个地方的路径，跟网络搜到的不一致，目录多了个mysql
6、发现临时密码不存在，需要初始化：mysqld：mysqld --initialize --user=mysql
然后再获取临时密码即可得到：grep 'temporary password' /var/log/mysql/mysqld.log
7、登录mysql：
mysql -u root -p回车输入密码后报错：
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
各种看都试了，最后看下面连接
https://www.cnblogs.com/wangpingcong/p/14000678.html
原来是服务没有启动，运行systemctl start mysqld.service命令，看到下图active(running)再登录就好了
8、接下来就是修改默认密码，开始操作数据库吧！！！！！