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 is it recommended to add nodatacow to a VM image on BTRFS, but using a QCOW2 disk is ok?
As far as I know, it is recommended to disable copy on write for VM images to avoid performance degradation on BTRFS. However, no one recommends against using qcow2 disk image format, despite being a ...
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How to create a virtual monitor to confine a full-screen application
I use Weylus to draw remotely in my Debian system from my smartphone which dimensions exceed all those of my physical monitors and are not a scale of them. The problem is in reason of their dimensions ...
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Debian virtual machine no connectivity with two network adapters
I am running several Debian 12 (both host and guests) virtual machines using VirtualBox.
All of a sudden, today they started having connectivity issues (i.e., I couldn't ping 8.8.8.8). I recently ...
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Performance problems when running Wireguard between virtual machines
I’m running into performance problems with Wireguard tunnels running between two virtual machines on the same hypervisor (running under Qemu/KVM) and I would greatly appreciate any insights/advice ...
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Why a user could run qemu virtual machine in KVM mode without access to /dev/kvm on Debian 12 (bookworm)?
One user account A, could run qemu VMs with kvm enabled, with the option -enable-kvm.
But user A does not have access to /dev/kvm. The related user groups and /dev/kvm permission is as follows.
$ id
...
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VMWare Fusion Linux Ubuntu not recognizing mac OS, asking to erase disk
Im trying to install Ubuntu on my virtual machine, VMWare Fusion. I'm running version 12.2.5, and I downloaded the .iso file for ubuntu for version 23.4 here: https://ubuntu.com/download/desktop
I ...
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Problems with booting same Linux installation on both physical System and VM for dual use
The question basically boils down to "how does a Linux installation need to be setup in order to be able to do boot from both VM and the physical machine?"
I try to achieve 2 goals with this ...
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Ubuntu Virtual Machine not detecting Arduino, it yields "Can't attach the USB"
I am facing an issue when I try to detect the Arduino on the Virtual Machine which is running Ubuntu 20.04. When I connect Arduino on my Laptop (Macbook), the Arduino IDE on the Mac detects the ...
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Error : virHostCPUGetKVMMaxVCPUs: KVM is not supported on this platform: Function not implemented
I'm running Debian bookworm on my ARM Chromebook,model "xe303c12" and I've recompiled the kernel (5.4) to enable KVM,so now my system sounds like this :
$ lsb_release -a
No LSB modules are ...
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Laggy mouse cursor on windows guest
I have virt-manager, qemu, kvm setup. I have installed Windows 11 and Arch Linux guests. On Arch Linux, I don't have any additional guest drives for virtualization to work.
On Arch Linux, when the ...
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Joining mininet hosts to Active DIrectory VM
I am trying to add mininet hosts to domain in a test environment. I have a host OS (WIn 10) with 2 VMs. One mininet VM and the other WIndows Server 2012 VM which is domain controller. I want the ...
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Is it possible to get a resolution greater than 1920x1200 on openbsd in qemu ( virt-manager)?
How to increase screen resolution in openbsd if it possible? It is necessary to have a resolution such as 2k or 4k.
Tried virtio, qxl there is even smaller than in VGA, checked the maximum resolution ...
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archlinux on vm (created by libvirt) can not start up?
there is the domain xml for vm0x01:
<domain type='kvm' id="1">
<name>vm0x01</name>
<uuid>4dea24b3-1d52-d8f3-2516-782e98a23fa1</uuid>
<genid>...
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File Permission problems with a Linux VM - unable to read file
I have built a Rocky Linux (9.1) Virtual machine, and I am having permission problems with some of the files. Note also (after looking at the linked 'similar questions'), this is a local mount, not ...
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Is it possible to implement kvm/qemu VM guests and host connected through shared memory to collect and cache data between them
The configuration:
host: Ubuntu:20.04 OS
guest: Ubuntu20.04 OS
The two files use the 9p file system for interworking.
The mount command is as follows,
mount -t 9p -o trans=virtio tmp_shared /mnt -...
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Can't connect: No route to host -- l2ping Linux
I'm testing out l2ping via a Ubuntu VM on a MacOS machine, ran using UTM QEMU.
The following command:
sudo l2ping -s 5000 -f <my speaker's bluetooth MAC address>
produces
Can't connect: No ...
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QEMU-KVM Freezes on Guest Reboot - How do I fix this?
I haven't tested it on a Linux guest, but on a Windows 10 virtual machine guest most reboots freeze in the middle of starting back up. This has never happened with me on VirtualBox, and I wouldn't ...
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Can not find USB stick after attach it to VM
Am an amateur debian11 user (In contrast to an expert :-). My pc installed Debian 11 KVM/QEMU. Under Virt-Manager, VM connect to host USB successfully with the option == redirect USB device.
Need to ...
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Two host name for a virtual machine - 1st name given during development release , 2nd name in production
We want release VM images to customer .
After deploying VM image, customer want to have their own VM name, basically two host name is needed
1st name given during development let us call "factory ...
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Editing a debian img with QEMU
I'm trying to run an existing debian img with QEMU, edit it by installing custom packages and adding various configs, verify that it works and then write it to an sd card so I can boot it from a ...
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Share folders between host and Debian(guest) using Vbox
After following these steps to share folders between host and guest, it works correctly without any errors, but I have a problem: when I turn off the machine or restart it, I cannot share the same ...
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How to block a range of ip adresses with libirt's nwfilter for a specific mac(VM)
I'm a bit lost how to block a range of Ip adresses(preferbly for a specific mac adress of a VM)
<filter name='local-fileserver-only' chain='ipv4' priority='-700'>
<uuid>blank for now</...
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qemu-system-x86_64 not found when moving VMs between computers
I am moving GNOME Boxes virtual machines from Fedora to Guix following the guide on Fedora wiki.
On the Fedora workstation:
$ virsh list --all
Id Name State
-------------------------------...
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Incorrect MAC error while using ssh from windows to linux
I am trying to ssh from a windows system to an azure centos vm. But I am getting error incorrect MAC ... On further checking i identified it only happens when the mac algorithm used is umac-128-etm@...
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Separating work and personal network activity [closed]
I asked a question here that got no answers and only one comment (and then my own answer), so maybe I was asking the wrong question.
I use the same computer for work and for personal use. I keep the ...
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Disk size issue in Linux lite running in VirtualBox and different information from different apps
I have a VM running Linux Lite 5 for quite some time now. Recently I've been having disk space issues.
I have cleared as much as I can and I have also increased the size of the virtual disk in virtual ...
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is it possible to oversell KVM VPS? [closed]
I found a cloud service provider selling VPS with a cheaper price compared to other companies. They claim to use kvm for virtualization so it made me curious is overselling hardware the reason of this ...
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Virtualize 3070 For Ubuntu VM and Win 11 Host
I am using Hyper-V as my hypervisor and would like to virtualize my 3070 and pass it to the Ubuntu VM.
Is it possible to do this without DDA? From what I have read, DDA gives the entire GPU to the VM ...
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isc-dhcp-server and dnsmasq is not working in Virt Manager(debian) KVM
I am trying to make a DHCP server in a VM what I pass a PCI ethenet adaptor to.
with dnsmasq I get the "interface ens7 does not exist"
dnsmasq.conf
interface=ens7
port=53
I tryed isc-dhcp-...
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virt-sysprep libguestfs read-only filesystem error when cloning VM
I am trying to follow this guide to clone a qemu VM. However, when I try to run virt-sysprep on the image it gives me this error:
virt-sysprep: error: libguestfs error: rm_f:
/$Recycle.Bin/S-1-5-21-...
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Can't write to Live CD system
I am not new to Linux, but am new to creating my own virtual machine environment. I am using Linux to learn how to do penetration testing, and have been required to download lots of different software ...
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Fedora Incorrect Login when installing vm through qemu
I am trying to boot fedora vm on Linux Test Pc from qemu. It actually shows the temporary password for first login. But when I try that password it is saying Login is Incorrect.
I don't know why the ...
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VirtualBox 7.0 guest freezes whenever the guest is switched into full-screen mode, fix?
On my Linux Mint 21.1 Cinnamon running an nvidia-driver-530...
VirtualBox 7.0 guest freezes whenever the guest is switched into full-screen mode. The exact version follows:
$ apt-cache policy ...
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KVM vm network performance is super slow compared to host
I am running a KVM Windows 11 VM guest with an arch linux host. I have tried across multiple windows and linux guests and the network performance is the same across the guests, so this is not a guest ...
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QEMU command with NVME boot is functional but cannot convert to virt-install parameters
I'm attempting to convert a working qemu command to virt-install parameters. The working command is:
qemu-system-x86_64 -bios /usr/share/OVMF/OVMF_CODE.fd -boot c -drive file=/vm/image.qcow2,if=none,...
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Ubuntu server process keeps shutting down after some time
I've been starting a web server process using nohup on a hosted Ubuntu 22.04.02 LTS VPS (virtual private server) to make it run in the background and keep it running even if the SSH session is ...
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How can I make my routers DHCP server issue a IP so my QEmu VM can be accessed anywhere from the network?
I have an Ubuntu 20.04 machine running Docker and LXD. Therfore it has a Docker0 bridge and a LXDBR0 bridge.
I need to connect a QEMU VM (vManage) to my local network so I can access it from any ...
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Freezing Issue Related to Connectivity
I'm running Kali on a VirtualBox machine. I send a TPLINK USB wi-fi adapter through to the VM, and when connected it works pretty much as expected. However, sometimes the Wi-Fi will randomyl ...
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Linux UTM VM Hardware Clock is Incorrect
My machine natively runs MacOS Ventura 13.3.1. I am using UTM to run 5.14.8-arch1-1. I am on PST. The output of sudo hwclock --verbose is as follows:
hwclock from util-linux 2.37.2
...
Hardware clock ...
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Is there a way to have separate dev environments on one laptop
I am setting up a new laptop and I am hoping to set up several different programming environments without getting them to step on each other.
My actual uses are varied, but let us take a specific ...
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super / windows key in virtual machine(qemu/kvm) opens the menu on my host aswell
i've been having this issue ever sinced i switched my Desktop enviroment from gnome to kde,basically whenever i press super it opens the menu on my host as well and its really quite frustating apart ...
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KVM - Oracle Linux 8 - RAC Installation (Private IP Problem)
KVM virtualization is running on 2 different physical servers. Each of the nodes will run on a physical machine. Oracle RAC installation will be done on OL 8.x operating system as KVM Guest.
I want to ...
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How to connect an access point and a station using mac80211_hwsim in 2 separate qemu instances?
I'm exploring wifi virtualization with qemu running Linux. I am attempting to accomplish the following setup
The access point runs inside the first qemu instance with mac80211_hwsim simulated radio ...
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How do I add a shared folder between an Arch host and a Debian guest on QEMU (I've already tried a few things)?
I just installed a new Debian guest system on my Arch host and would like to transfer some files to it, so I wanted to create a shared folder. I installed the system using GNOME boxes, so I tried ...
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How to build qemu with additional machine types
I'm trying to migrate around 40 KVM VMs (containing a few hundred live snapshots mostly used for automated testing on Windows) from a Ubuntu 22 server to a Debian 11 server. The machine type of most ...
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MAC detection in bluetooth
I have bluetooth dongle connected to my system which is having kali linux installed on VM . Now in kali linux When i run hcitool or l2ping command it detects other bluetooth devices mac addresses but ...
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KVM - Windows guest cannot access host, but can ping both directions
I have a host running Fedora 36, guest is Win11
I am attempting to share a directory on the host box with a windows 11 guest.
Through research I found that samba is the generally recommended way to ...
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Uplink-less Bridge with systemd-networkd
I am trying to configure several Linux bridges, all without physical uplinks, for use as isolated virtual networks with KVM/QEMU. I am running Archlinux, which uses systemd-networkd to configure ...
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GDM doesn't start after plymouth (bootsplash) and returns to grub - Debian on a Oracle Virtualbox VM
Each time when I start this VM with Debian I can't able to reach the GDM screen to make the login, instead of it, when the machine is initialized on grub it goes to the plymouth and after that it ...
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How to bring-up PCI passthrough for NIC card in ubuntu ARM based system
I have Intel x700 series NIC card on my ubuntu 22.04[ARM] based system
And using KVM for virtualization, I need to use these NIC ports for guest VMs.
If any document to setup PCI passthrough for NIC ...
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