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Questions tagged [virtual-machine]

A virtual machine (VM) is a guest Operating System running in a completely isolated environment within a normal host operating system. Modern virtual machines are implemented with either software emulation or hardware virtualization or (in most cases) both together.

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Why installing Arch linux on virtual box in Windows 11 OS shows boot error?

Installing Arch linux causes issues when trying to configure boot like this: [root@archiso /]# mount -t efivarfs efivarfs /sys/firmware/efi/efivarfs/ mount: /sys/firmware/efi/efivarfs/: fsopen system ...
fahad's user avatar
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QEMU/KVM connection drops immediately after starting up virtual machine with GPU passthrough

I have a Windows 10 virtual machine with GPU passthrough in Virt-Manager. Recently it has suddenly started to crash the QEMU/KVM connection it is connected to, as in spontaneously disconnecting. Is ...
wharbait's user avatar
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Serial Console is not accessible from VMs created from a custom AlmaLinux 9.3 image

I'm currently following the "RHEL 8+ using Hyper-V Manager" section in Microsoft Azure's documentation link to create RedHat Azure images. I've successfully created a modified AlmaLinux 9.2 ...
supmethods's user avatar
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Is my characterisation of KVM and QEMU accurate?

I usually write essays on topics I am studying to help my understanding. Below are excerpts from my study of Virtualisation. I would like comments from real professionals on their accuracy. KVM is ...
bonecrusher's user avatar
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How to create a VM in xcp-ng?

I want to create a VM by using a VM template on xcp-ng 8.2. I was able to do this yesterday but today, the same command isn't working. I'm new to server administration so I want to believe this fix ...
Yaw's user avatar
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Copy/paste via virt-manager to a kvm text mode guest

I have done what's mentioned in virt-manager copy paste functionality to the vm Environment: Ubuntu 22.04 server (VM) and Kubuntu 22.04 (virt-manager) Installed spice-vdagent on the VM and spice-...
Senior Geek's user avatar
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1 answer
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Core differences between different cloud kernels

There are different Linux kernels for different cloud environments. For example, Canonical offers the linux-azure, linux-kvm, linux-gcp, linux-gke, linux-gkeop, linux-oracle and linux-aws variants, ...
Juergen's user avatar
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how to identify unused usb ports in linux

I have been searching across the internet about a way to get a list of unused usb ports so that i can check whether those unused ports are disabled or not, but there's no such info. does anyone have ...
Arnav Razdan's user avatar
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1 answer
102 views

EFI variables are not supported and efibootmgr failed to register the boot entry

I'm trying to install grub as my bootloader for my arch linux installation. I am doing this on a virtual machine before I do it on my actual system. I have been following the Arch Installation guide ...
Alteria's user avatar
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Unreliable bind-mounts

On a RHEL8-based virtual machine running systemd 239, I have the following bind-mount setup: a filesystem (identified via UUID) mounted to a "source" mount-point (/path/to/sourcemnt) ...
AdminBee's user avatar
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Near errorless issue with VirtualBox and/or nfs

Server/host: DISTRIB_DESCRIPTION="Ubuntu 22.04.4 LTS" Server NFS-common version: nfs-common/jammy-updates,now 1:2.6.1-1ubuntu1.2 amd64 [installed,automatic] Server NFS-server: nfs-kernel-...
brad's user avatar
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PCI Passthrough PCI Slot Reference Change

I'll do my best to explain this as its confusing. I have Qemu/Virtual Machine Manager on my host PC. I created an Ubuntu VM and assigned two PCI slots (which are physical network cards) to it within ...
john smith's user avatar
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is it possible to boot into luks encrypted raw disk image with qemu/libvirt/virtualbox?

Done dd of my luks encryted drive, now im courious if its possible to create libvirt/quemu guest and attach that luks encrypted raw image and run it as is? Actually I have Fedora 38 on it with several ...
tomandjerry's user avatar
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Why I see different cpu-migrations from top and perf stat?

New to system performance analyze. I am curious on how CPU affinity affect kvm virtual machine. So I try to bind vm's vcpu to physical cpu to improve vm's performance. find the pid of the vm(ecs-...
coolder's user avatar
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Resized disk and immediately filled up

I'm on a VM, and I was low on space so I resized the disk to 100GB. I ran sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv to make use of the extra space, and now it shows my "104GB Block ...
pauib's user avatar
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How do I physically pass a USB device to a QEMU VM

I've been trying to use a Linux QEMU virtual machine for USB driver development. I wanted to use USB passthrough but when I check the USB device in the VM, it shows some kind of generated product id ...
Mach's user avatar
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Oracle Linux VM- run script on startup?

I have essentially zero knowledge about this. My problem is that I can't find information about how to add a script on startup of a Oracle Linux Virtual Machine- only on one running ubuntu. How would ...
Seth Temple's user avatar
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1 answer
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How to start a qemu virtual machine and from the host, execute some commands to finally shut it down

I'm deploying virtual machines with qemu. Installed OS is Debian with linux kernel debian 6.8.11-amd64. The way I deploy a vm is directly with qemu-system command (i.e no vm manager). In a command ...
Pierre's user avatar
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Recover damaged & luks-encrypted BTRFS partition

Here's my problem: I have a Virtual Machine that I had to reset because the UI became very buggy after I tried to mount a hot-pluggable virtual disk image to copy some files. Well that was actually ...
LinuxUser576249's user avatar
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3 answers
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What minimum linux's root partition size for virtual machine

I wanna install multiple linux distro (Ubuntu, Fedora, Manjaro, Opensusue, etc) via virtual machine (qemu) with shared /home partition for testing purposes, which i'm not gonna install anything big or ...
Noober's user avatar
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I can only ssh into my VM server from the local VM host

I can only SSH into my VM server from the host machine of the VM. I want to be able to SSH into my VM server from any computer on my real local network. I'm running some dev tests so I'm running some ...
user avatar
-1 votes
2 answers
121 views

Limiting the file size of .qcow2 files [closed]

Qcow 2 files are an open source file format for virtual machines. In my opinion, unlike .vmdk files, they do not offer the option of specifying a maximum file size. This means that they can constantly ...
Alfred.37's user avatar
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How to configure DNAT in iptables between host os (FreeBSD) and guest os (Ubuntu 23.10) so that I can use Cloudflare on both the OS

I've just installed the CloudFlare client + GUI on Ubuntu,that I have virtualized with bhyve (the FreeBSD hypervisor). Cloudflare does not work on FreeBSD. The instructions that I have followed are ...
Marietto's user avatar
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Converting a virtual machine a standalone directory hosted on Ubuntu

A software platform I'm responsible for requires a minimal Ubuntu distribution with software that is partially integrated with the OS and uses TTY terminals. We've typically contained the OS in a ...
Chase Schuette's user avatar
-2 votes
1 answer
19 views

How to establish sftp connection in vsphere client

I have been requested to establish SFTP connections using vSphere client. Initially, I tried to launch a web console, but after some questions about disk partitioning the screen just went blank. Thus, ...
Dimitris Tsiaousidis's user avatar
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56 views

QEMU/KVM: capturing keyboard shortcuts by the guest operating system

I have installed QEMU/KVM on my Ubuntu and created a new VM. When trying to switch apps using Alt+Tab or "Show Applications" using Windows key it is captured and interpreted by the host OS ...
etbaba's user avatar
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1 vote
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Is it possible to hardware accelerate spice with an nvidia gpu?

It is possible to use virgl with an nvidia gpu: <graphics type="egl-headless"> <gl rendernode="/dev/dri/renderD128"/> </graphics> <video> <model type=...
Cestarian's user avatar
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Ubuntu Cloud Image terminal display resolution

I've been testing out the Cloud Image variants of Ubuntu Server on a Proxmox VE, but I encounter one issue with the NoVNC console - the resolution seems to be something like 640x480 which is very ...
alex.b.bg's user avatar
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Networking Errors on KVM

I am trying to run a KVM virtual machine on Debian 11 (Bullseye) I'm also running this from crouton on ChromeOS in case that's like really crucial, but I don't think it is. Here's the error: Unable ...
John Garlic's user avatar
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94 views

Qemu GPU/Display passthrough

I want to passthrough my GPU to the QEMU Guest and it complete control of my monitor (seem as if it was the ONLY OS running) I have tried on a laptop with only the built-in monitor and the screen just ...
user18812922's user avatar
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67 views

Pass-through of OBS Virtual Camera to QEMU

I'd like to use my OBS virtual camera in a virtual machine. OBS will not run within a virtual machine unless I perform a GPU-passthrough, which I feel is unnecessary and undesirable in this situation. ...
adamlaughlin's user avatar
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18 views

VirtualBox-Redtat 7.9

I'm using Apple Macbook and I have VirtualBox in it. within my Virtual Box I have RedHat 7.9 I need to make a USB drive that i'm connecting into my MacBook visible into redhat. what is the steps ...
Nawar Alqadhy's user avatar
1 vote
0 answers
39 views

Display bmp image using u-boot on virtual QEMU

I have an issue of displaying a bmp image using u-boot on virtual QEMU. I've built QEMU using buildroot and added the following options in u-boot.fragement file to support splash screen and virtio gpu:...
Mikhail's user avatar
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1 answer
58 views

Extend partition on RedHat VM without losing data

I have a VM with RHEL which serves as backup repo for Veeam. And now I need to extend partition for backups. Original size was 17TB I extended HDD in VMware to 19TB (it's a second HDD in VMware), and ...
Rasputin's user avatar
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1 answer
95 views

Files not listed when mounting VM image with guestmount

When I mount the disk image of a (stopped) KVM virtual machine, ls shows the home and tmp directories as empty, even though inside the virtual machine they are not empty and on the next run (after ...
user22495's user avatar
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1 answer
73 views

Kali linux monitor mode [duplicate]

I'm new to Kali Linux, in theory my laptop suports wifi monitor mode (Microsoft Network 3.4) but when i installed kali linux (pre-built) on VirtualBox and went through the options it was not showing ...
Natanael Gonzalez's user avatar
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0 answers
29 views

Trying to virtualize my Windows 10 install on linux in a dual boot setup

Currently I am dual booting Windows 10 and linux (fedora 39 with KDE), here both are on separate SDDs. I was hoping to use linux for most things and use Windows 10 for games. But here, I am trying to ...
TheRobot140's user avatar
-1 votes
1 answer
59 views

using rsync to measure difference between filesystems?

I'm running some expiriments to test filesystem differences, for example upgrading an older nixOS version and newer one to the same flake/configuration, as well as the same with debian and ansible. I'...
ebrowningizer's user avatar
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0 answers
32 views

User space swap

I have low physical memory 1GB in my VPS container based (LXC), therefore I can't change kernel parameter such as swap memory swappiness. Even though there is swap allocated from built-in VPS when I ...
Muhammad Ikhwan Perwira's user avatar
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0 answers
469 views

VirtualBox: error while trying to perform a drag and drop operation from guest to host

I'm getting the following error when I try to drag and drop a file from my Debian guest to the host: Drag and drop operation from guest to host failed Details: DnD: Error: Requesting pending data ...
ViktorKozlov's user avatar
4 votes
1 answer
377 views

Can I use SELinux to add an extra layer of protection against 0-day VM escape exploits in KVM/QEMU?

My host is Fedora, and I want to add an extra layer of protection against 0day KVM/QEMU exploits that execute code on the host. For example there have been CVEs where if we run a specially crafted ...
OneAndOnly's user avatar
-3 votes
1 answer
51 views

what is storage virtualization in contrast to? [closed]

i'm reading up on storage virtualization https://en.wikipedia.org/wiki/Storage_virtualization and i'm trying to understand what this is in contrast to, or a solution to, or why it exists at all? some ...
How To Linux's user avatar
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0 answers
378 views

Stuck on "Finished casper-md5check Verify Live ISO checksums."

I tried to run a Linux Mint 21.3 Cinnamon Edition vm in Hyper-V, but I've had some problems. When I used the Gen 2 option, it always displayed >>Start PXE over IPv4. When I installed using Gen 1,...
Ruben Driezen's user avatar
0 votes
1 answer
20 views

Number of sftp connections allowed in a VM

I understand that more than one SFTP connection is generally allowed. I would like to ask if this is possible even in a VM (virtual machine). In other words, I would like to establish more than one ...
Dimitris Tsiaousidis's user avatar
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0 answers
54 views

/bin/bash accidentally moved to another location

I have an Azure VM and while I was moving some files from my present working directory with the command mv, I accidentally missed the . in front of my source and instead wrote mv /* /destination/path ...
Amit Sharma's user avatar
0 votes
1 answer
49 views

Can't shutdown Linux guest OS with `at` command

Here are three examples of what I did inside the terminal (the third one has sudo): at now + 5 minutes (interactively:) at> shutdown --poweroff now echo "sbin/shutdown -h now" | at 14:...
Samir Fink's user avatar
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0 answers
12 views

Fedora Virtualbox VM details UI when clicked not visible?

I am in Fedora and I have installed virtualbox latest, earlier it was showing the UI of a VM when I click on it but later on , I initiated File manager and now I can only see below components on the ...
0xAnon's user avatar
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1 answer
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Tryng to enable the passhtru of one Nvidia gpu to a Bhyve Linux vm on FreeBSD 14.0

For some years it worked,but now,maybe due to the recent changes added on the FreeBSD 13 and 14 code,it does not work anymore : I'm talking about the ability to passthru one Nvidia GpU from the host ...
Marietto's user avatar
  • 549
0 votes
0 answers
20 views

oracle vm instance, no matches found

I am trying to launch chromium on Oracle-Linux-8.9-2024.01.26-0 it is a vm i got from oracle, yet I get the following error root/.cache/puppeteer/chrome/linux-121.0.6167.85/chrome-linux64/chrome: ...
Ahmed Can Unbay's user avatar
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0 answers
23 views

After installing my centOS 9 on my oracle VB. It works fine but once I power it off, I won’t be able to boot again. It just keep rotating endlessly

The oracle virtual box was installed on my windows 10 with a 4gb ram. When installing the centos9 I choose 2gm processor space and 20gb storage space.
Ugwu Peter's user avatar

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