官网下载：https://dev.mysql.com/downloads/mysql/5.7.html#downloads 但需要注册账号
直接下载：wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-5.7.24-linux-glibc2.12-x86_64.tar.gz
安装建议：https://www.cnblogs.com/hsbt2333/p/9915616.html
不建议：https://blog.csdn.net/liulihui1988/article/details/78050671
https://www.jb51.net/article/150079.htm
