添加国内更新镜像源，参考链接：https://blog.csdn.net/inslow/article/details/54177191
卸载旧版mysql，参考链接：https://blog.csdn.net/zhwyj1019/article/details/80274269
安装mysql8.0，参考链接：https://hostadvice.com/how-to/how-to-install-mysql-8-0-and-create-a-database-on-a-centos-7-linux-vps-or-dedicated-server/
Good Luck !