openmediavault是一个开源的NAS解决方案，安装一个omv就相当于安装了一个Debian系统。
第一次装omv下载的是omv5，然后又重装了omv4，悲催
直接从sourceforge上下载从omv5是单线程的，慢的难受。这里可以获取直链然后用IDM下载。
在浏览器中拿到文件的地址：
https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso
用wget下载：
$ wget https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso
--2020-11-11 21:29:43-- https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso
Resolving sourceforge.net (sourceforge.net)... 216.105.38.13
Connecting to sourceforge.net (sourceforge.net)|216.105.38.13|:443... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso/ [following]
--2020-11-11 21:29:44-- https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso/
Reusing existing connection to sourceforge.net:443.
HTTP request sent, awaiting response... 302 Found
Location: https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso/download [following]
--2020-11-11 21:29:45-- https://sourceforge.net/projects/openmediavault/files/5.5.11/openmediavault_5.5.11-amd64.iso/download
Reusing existing connection to sourceforge.net:443.
HTTP request sent, awaiting response... 302 Found
Location: https://downloads.sourceforge.net/project/openmediavault/5.5.11/openmediavault_5.5.11-amd64.iso?r=&ts=1605101385&use_mirror=nchc [following]
--2020-11-11 21:29:46-- https://downloads.sourceforge.net/project/openmediavault/5.5.11/openmediavault_5.5.11-amd64.iso?r=&ts=1605101385&use_mirror=nchc
Resolving downloads.sourceforge.net (downloads.sourceforge.net)... 216.105.38.13
Connecting to downloads.sourceforge.net (downloads.sourceforge.net)|216.105.38.13|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://nchc.dl.sourceforge.net/project/openmediavault/5.5.11/openmediavault_5.5.11-amd64.iso [following]
--2020-11-11 21:29:48-- https://nchc.dl.sourceforge.net/project/openmediavault/5.5.11/openmediavault_5.5.11-amd64.iso
Resolving nchc.dl.sourceforge.net (nchc.dl.sourceforge.net)... 140.110.96.69, 2001:e10:ffff:1f02::17
Connecting to nchc.dl.sourceforge.net (nchc.dl.sourceforge.net)|140.110.96.69|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 608174080 (580M) [application/octet-stream]
Saving to: ‘openmediavault_5.5.11-amd64.iso’
openmediavault_5.5.11-amd64.iso 0%[ ] 296.00K 10.2KB/s
Ctrl + C 结束下载，从日志中找到文件的直链：
https://nchc.dl.sourceforge.net/project/openmediavault/5.5.11/openmediavault_5.5.11-amd64.iso
Get! This is the direct URL for downloading!