https://blog.wongcw.com/2018/10/16/cloudcone%ef%bc%9a15-%e5%b9%b4-256mb%e5%86%85%e5%ad%98-10gb-ssd%e7%a9%ba%e9%97%b4-1tb%e6%b5%81%e9%87%8f-kvm-%e6%b4%9b%e6%9d%89%e7%9f%b6/