OMV-Extras.org插件介绍：
主要包含如下三个部分：
- docker和docker的web管理器portainer
- cockpit，一个类似webmin的简单版本
- 一些维护工具：kernels，proxmox,clonezilla,Gparted live,systemRescueCD
遇到的问题：命令行安装因为要访问githu.com，偶尔被墙了。无法安装。
解决方法：下载对应的版本，到omv后台上传后安装。
官方描述，
Description
OMV-Extras.org is a plugin which enables you to do several things...
- Install backports kernel
- Install even more plugins.
Installation
From command line as root (preferred method)
wget -O - https://github.com/OpenMediaVault-Plugin-Developers/packages/raw/master/install | bash
OR
From OMV web interface (alternative method)
- Download the plugin to enable this repository here:
- For OMV 2.x (stoneburner) - https://github.com/OpenMediaVa…vextrasorg_latest_all.deb
- For OMV 3.x (erasmus) - https://github.com/OpenMediaVa…extrasorg_latest_all3.deb
- For OMV 4.x (arrakis) - https://github.com/OpenMediaVa…extrasorg_latest_all4.deb
- For OMV 5.x (usul) - https://github.com/OpenMediaVa…extrasorg_latest_all5.deb
- Go to the plugin tab in OMV's web interface.
- Upload the file.
- Select the newly uploaded plugin openmediavault-omvextrasorg
- Click on Install.
- Refresh page.
- Go to the plugin tab and click Check.