Mount an external drive in a linux server through SSH - ssh

I have an Ubuntu Server. I have an external drive connected through USB. I use external drive with jellyfin for my movies. It works fine, but when I reboot server. The drive is no longer mounted, and I have to connect my monitor to the server and mount it. Is there a way to mount it remotely through SSH? I already tried to auto mount it in a script, which I don't remember, but that seems to not work (it did for a while).

Related

Can I run one WSL2 virtual machine instance on two system?

I'm new to the WSL2 and wondering if it's possible to run the same WSL2 ubuntu instance on both my desktop and laptop.
Now I am able to use wsl --export and wsl --import method to save and load the system to/from my portable hard drive. But these methods takes a long time.
I notice that wsl --import load a file named ext4.vhdx. Is there a way to load straightly from this file?
Update v2.0:
I was able to get a workaround and it works great.
Thanks to Booting from vhdx here, I was able to load straightly from my vhdx file on my portable hard disk. Windows track down its subsystem with regedit, So we can write our own(p.s: make sure to get BasePath right, it starts with "\\\\?", or you will not be able to access the subsystem' filesystem on your host system.):
Windows Registry Editor Version 5.00
[HKEY_USERS\【your SID here】\SOFTWARE\Microsoft\Windows\CurrentVersion\Lxss\{【UUID here】}]
"State"=dword:00000001
"DistributionName"="distribution name"
"Version"=dword:00000002
"BasePath"="vhdx folder path" 【 e.g. "\\\\?\\E:\\S061\\WSL\\ubuntu-20"】
"Flags"=dword:0000000f
"DefaultUid"=dword:000003e8
I suppose the best way to do this would be to store ext4.vhd on a network storage device accessible to both devices.
I have previosly mentioned how to move ext4.vhd. You can check that out here
Basically you need to export from one machine and import it while making sure the vhd file is configured for wsl to access from the network storage
Since this should *officially* not supported expect some performance hits
Another way would be to run WSL on one computer and ssh/remote desktop to it from another device on the network
I'm of the strong belief that sharing the same ext4 vhd between two VM's simultaneously would be a bad idea. See this and this Unix & Linux StackExchange, including the part about ...
note that sharing LVs/partitions on a single disk between the servers at the same time is NOT very safe. You should only access whole disks from any of the servers at one time.
However, as dopewind's answer mentioned, you can access the WSL instance on one computer (probably the desktop) from another (e.g. the laptop). There are several techniques you can use:
If you have Windows 10 Professional or Enterprise on one of the computers, you can enable Remote Desktop, which allows you to access pretty much everything on one computer from another. RDP ("Remote Desktop Protocol") even works from other devices such as an iPad or Android tablet (or even a phone, although that's a bit of a small screen for a "desktop"). That said, there are better, more idiomatic solutions for WSL ...
You could enable SSH server on the Windows 10 computer with the WSL instance (instructions). This may sound counterintuitive to some people, since Linux itself running in the WSL instance also includes an SSH server (by default). But by SSH'ing from (for example) your laptop into your desktop's Windows 10, you can then launch any WSL instance you have installed (if you choose to install more than one) via wsl -d <distroName>. You also avoid a lot of the network unpleasantness in the next option ...
You could, as mentioned above, enable SSH on the WSL instance (usually something like sudo service ssh start) and then ssh directly into it. However, note that WSL2 instances are NAT'd, so there's a whole lot more hackery that you have to do to get access to the network interface. There's a whole huge thread on the WSL Github about it. Personally, I'd recommend the "Windows SSH Server" option mentioned about to start out with, then you can worry about direct SSH access later if you need it.
Side note: Even though I have SSH enabled on my WSL instances, I still use Windows SSH to proxy to them, to avoid these networking issues.

Accessing ext4.vhdx via another machine?

Is there anyway to mount or access the ext4.vhdx on another machine? I understand that accessing the linux environment files while WSL is running will likely corrupt them; but I want to be able to access this hard disk image when WSL is inactive?

How to access the windows subsystem for linux 2 filesystem from another computer?

I know that I can access the wsl2 filesystem by just opening \\wsl$ on the local computer. Can I somehow expose this to another computer in the same network? The goal is to just have a network drive on a remote computer where I drop files to copy them directly to wsl2.
EDIT: While it is not exactly what I wanted, I just noticed I can run a FTP server inside wsl2 and just transfer files in and out that way. I am still leaving the question open though as there might be a simpler solution to this.
You can find your home folder of wsl on c drive (its in AppData) and use ordinary windows folder sharing.
You can mount your network storage directly into WSL like in a particular Linux.
Example for Ubuntu and SMB: https://askubuntu.com/a/1050499

Accessed the GCP VM SSH from local machine, but cannot view anything

I have accessed GCP VM from my local machine by SSH key. When I tried to view documents in the VM just simply typing "ls", but nothing showed up as picture presents. There were supposed to have some folders.
How can properly access the VM from my local machine?
GCP VM view from local machine

Accessing backing storage file from both Host machine and emulating machine when using USB Gadget

I have an embedded machine that is running g_file_storage. I would like to be able to access the backing store in read only mode from the machine while g_file_storage is running and a host machine is dropping files into this backing store.
Any idea how one can achieve that? I know that it is not advisable, but would like to try it anyway, and I simply need read access. Won't need to modify the backing store while it is connected
Was able to achieve this by creating a script that listens to specific events in dmesg that signals that a user has dropped a file on the USB. When that is done we unmount the drive, mount it as a drive on the machine , grab the file dropped by the user then remount the drive as a mass storage device