https://www.linuxidc.com/Linux/2017-09/147050.htm
https://blog.csdn.net/dazhi_1314/article/details/78222104
https://blog.csdn.net/salley2017/article/details/80027939
//
CentOS 7 安装. Net Core SDK 2.0
https://blog.csdn.net/ronmy/article/details/78039900
https://github.com/dotnet/core/blob/master/release-notes/download-archives/2.1.0-download.md
//FTP
https://www.centos.bz/2017/12/centos7%E9%83%A8%E7%BD%B2vsftpd%E6%9C%8D%E5%8A%A1/
//jexus
https://www.cnblogs.com/stulzq/p/7324616.html