Category: Virtualization / KVM / VirtualBox / xenserver

copy and paste this into the network config via virt-manager to limit download speeds for this vm to 1024KByte/s: <bandwidth> <inbound average=’1024′ peak=’1024′ burst=’2048’/> <outbound average=’1024′ peak=’2048’/> </bandwidth>

hostnamectl; # tested with Static hostname: workstation Operating System: Debian GNU/Linux 13 (trixie) Kernel: Linux 6.12.30-amd64 Architecture: x86-64 Hardware Model: Gigabyte B550 Aorus Elite AX V2 rev-1 Socket AM4 # gpu used nvidia RTX 5060 Ti 16GByte the idea start […]

virt-manager –version 5.0.0 kvm –version QEMU emulator version 9.2.93 (Debian 1:10.0.0~rc3+ds-2) Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers which kvm /usr/bin/kvm /usr/bin/kvm -> qemu-system-x86_64 /usr/bin/qemu-system-x86_64 –version QEMU emulator version 9.2.93 (Debian 1:10.0.0~rc3+ds-2) Copyright (c) 2003-2025 Fabrice Bellard […]

it’s still possible to use inernal snapshots btw Dear OpenSource and other communities, [+] virt-manager is a neat tool to manage virtual machines without having to go thorugh pains such as: # delete remove vmname (cleanly) # including its storage […]

if virsh (terminal) created snapshots do not show up in virt-manager, try the refresh button at the bottom good luck all involved related links: https://dwaves.de/2021/08/12/gnu-linux-how-to-kvm-qemu-start-clone-multiple-disks-snapshot-restore-revert-delete-shutdown-all-vms-start-all-vms-with-keyword-in-name-snapshot-all-vms-add-remove-disks/ https://dwaves.de/2020/12/05/gnu-linux-debian-10-11-how-to-install-kvm-virtualization-qemu-basic-virsh-commands-kvm-cheat-sheed-howto-workaround-virt-manager-emulator-may-not-have-search-permissions-for-the-path/

htop has a column called “S” (State) if the state of a process is “Z” (Zombie) that ain’t good htop states: S for sleeping process is waiting for an event to complete, could be I/O completion, a signal, or some […]

Yes… … well… YESSS finally it works! BUT! IT’S VERY BUGGY! programs crash now and then… so it’s not “production” ready. … the foxlet approach worked 😀 (also got stuck in the last minute of setup of mojave… but after […]

one fine day, THE USER needed to run a windows program… because it’s only available for windows. so fired up the Win 10 KVM VM and installed the program, because it took ages, let it run in the background… the […]

if the spice tools are installed, clipboard sharing between host and guest (copy & pasting text and even images (!)) should (!) work 😀 What is not working virtualbox-easy-style (yet) is easy-host-to-guest-and-vice-versa-file-transfer (which IS VERY ANNOYING (RedHat are you listening? […]

snapshots are stored inside the qcow2 harddisk file of the vm, which is good in terms of “simple”, just one file, where in virtualbox there is the disk.vdi and snapshots are stored in a separate folder as separate files. when […]

Especially important: how fast does existing x86 software (as virtualmachine or docker container) can be run on very energy efficient ARM SoC? Apple already demostrated that with their M1/M2 (soon M3?) ARM based chip designs (congratz!) it is possible to […]

In search for alternatives, decided to test drive “gnome boxes“, which is said, to be an easy-going gui for the libvirt qemu virtualization system. lsb_release -d; # tested on Description: Debian GNU/Linux 11 (bullseye) su – root apt update # […]

virt-manager Links: run search: https://dwaves.de/?s=kvm GNU Linux Debian 10/11/Ubuntu – how to install kvm virtualization (qemu) – basic virsh commands – kvm cheat sheed – howto workaround virt-manager “emulator may not have search permissions for the path”

make sure guest additions are installed (on the guest vm) it is a simple matter of the user not being in group “vboxsf” and thus denied usage of vbox filesystem service (fs) lsb_release -a; # tested on guest Description: Debian […]

not employed by Oracle in any kind, the only advantage VirtualBox (still) has over all the other virtualization systems: was designed to be cross OS from the start and does that pretty well. Holy Crap! Google (crazy guys) ported KVM […]

# if the user wants to be converted from VirtualBox to kvm # 1. first clone the VirtualBox vm into a new vm (to consolidate all snapshots into one vdi # 2. convert file format # convert qcow2 to vdi […]

lsb_release -a; # tested with Distributor ID: Debian Description: Debian GNU/Linux 11 (bullseye) Release: 11 Codename: bullseye su – root wget https://download.virtualbox.org/virtualbox/6.1.32/virtualbox-6.1_6.1.32-149290~Debian~bullseye_amd64.deb sha512sum 7e977fde8a2fc370d7df24f761e75eced308ea17037113db877bd799abec4a3a9b6324fcbfda2d2a67d63fbe23b822abbd36ab0f9af4fc5c352df04a97dbe550 # needs to be dpkg installed manually # install requirements apt update && apt upgrade apt […]

it is actually like this, in virt-manager, that chipset and bios can only be changed during first setup “begin installation” it then is fixed and can not be changed in virt-manager

let’s say: in theory – it works – in practice vmware and kvm (RedHat) would REALLY have to work together to make this work for real. in reality – there are (currently) massive sata harddisk driver problems between esxi 6.7 […]

update: workaround X-D ssh tunnel the port from host to vm: ssh -g -L 139:localhost:139 user@192.168.122.162 this would open local port 139 and forward it to port 139 of vm 192.168.122.162 # from host test if mounting the vm’s samba […]

how to setup kvm on Debian: hostnamectl; # tested on Static hostname: lenovo Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 hostnamectl; # also on Operating System: Debian GNU/Linux 12 (bookworm) Kernel: Linux 6.1.0-17-amd64 hostnamectl; # also […]

“thin provisioning” means “virtually” allocate more harddisk space, than the harddisk (physically) has, then grow the virtual harddisk file according to it’s needs (store more files = size of harddisk.img grows dynamically) # debian 10; # tested via bash terminal: […]

the error message basically means: the VM’s screen can not be auto-resized because the VBoxGuestAdditions kernel module drivers software was not properly build & installed. the solution: rebuild & reinstall the VBoxGuestAdditions (kernel module) properly: hostnamectl; # tested on guest […]

so RedHat developed the virsh manager, but not qemu itself. https://stackoverflow.com/questions/43704856/what-are-the-differences-between-qemu-and-virtualbox QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an […]

BACKGROUND INFO: how does kvm use qemu? KVM (Kernel-based Virtual Machine) is a virtualization solution for Linux on x86 hardware. It allows running multiple virtual machines (VMs) on a GNU Linux host by leveraging hardware virtualization extensions such as Intel […]

btw: love kvm (used by very large companies) just as virtualbox (oracle) the task: over the years a windows vm is using up massive amounts of precious server harddisk space (snapshots before everyupdate) all the snapshots now add up to […]

https://wiki.archlinux.org/title/benchmarking update 2025: very basic cross os distribution monitor harddisk speeds bash script by counting sector read write update 2022: next to the good old (non-destructive if used correctly) “dd” is still the way to go for benchmarking harddisks under […]

i really like virtualbox and i think it has great potential, what i do not like SOOO much is the CIA’s involvement with Oracle. “Larry Ellison Is A Billionaire Today Thanks To The CIA” (src) VirtualBox is mostly GPL 2.0 […]