https://blog.wongcw.com/2018/01/18/%e5%a6%82%e4%bd%95%e5%b0%86linux%e7%b3%bb%e7%bb%9f%e4%b8%8a%e7%9a%84mysql-mariadb%e4%bb%8e5-5%e5%8d%87%e7%ba%a7%e5%88%b05-6-5-7%ef%bc%9f/