Category: Virtualization / KVM / VirtualBox / xenserver

in addition to select “IDE emulate” in VM Settings one should also restart 1) client 2) server 3) vm  

sometimes one wants to restart a windows vm every x days – to clean up RAM and Co. run task scheduler “Aufgabenplanung” %windir%\system32\taskschd.msc /s File/Datei -> New/Neu -> Basic Task/Einfache Aufgabe select or copy paste: %SystemRoot%\System32\shutdown.exe one has to scroll […]

running esxi inside virtualbox vm is just a test, to play with it, unfortunately one will not be able to start vms on it, because of the lack of nested virtualization. (could/should work nested inside quemu-kvm?) the problem: should have […]

Update: kvm is also a good alternative, but only on linux hosts, so if the user plans to move vms between linux and windows hosts, virtualbox is the way to go. Update: 2020-02: VirtualBox 6.1 is available in repository “Debian […]

# setup log of VirtualBox Graphical User Interface Version 6.0.10 r132072 (Qt5.7.1) # on Debian 9.8 with Cinnamon Desktop # go into software repo user@debian98:~$ cd /software/ # download latest version of software user@debian98:/software$ wget https://download.virtualbox.org/virtualbox/6.0.10/virtualbox-6.0_6.0.10-132072~Debian~stretch_amd64.deb –2019-08-03 14:36:05– https://download.virtualbox.org/virtualbox/6.0.10/virtualbox-6.0_6.0.10-132072~Debian~stretch_amd64.deb Resolving […]

usually host-shared-folder get auto-mounted during boot via vboxsf kernel module. symptoms: # manually mounting the by-host-shared-folder “projects” # as user with uid 1000 and groupid 1000, results in: mount -t vboxsf -o uid=1000,gid=1000 projects /media/sf_projects # also try: mount -t […]

Short stoy: AltGr (HostKey) + C will quit “seamless (no menues) mode” really like the cross-os capabilties of virtualbox (possible to move vms between GNU Linux and Windows servers) and think it has great potential, what is not so great […]

this is a very very basic sequential harddisk write test performed on host and guest. there are multiple ways, how you could improve the performance: Use fixed size disks Allocate RAM and CPUs wisely Install the Guest Additions enable host […]

https://youtu.be/LC0aSk6HEsw first of all: i (still) love VirtualBox. The ability to migrate VMs between Windows and Linux servers is really cool, and it is still free to use. NO other Virtualization software can do that! 🙂 and that is exactly […]

lately on WCG: Avoid CO2 use the Fusion Reactor in the Sky (if the 2 is pronanced German than it even rhymes) as a lot of fossil fuel is (still in 2021!) used to produce electrictiy, it is possible and […]

basically everything that you can do with the super conveniant virtualbox gui you can do from the commandline on a headless server. # set default vm directory # where all vms should reside in # also if you clone a […]

WARNING! WARNING! WARNING! BACKUP BEFORE UPDATING ANYTHING! it is also recommended, to do extensive testing of updates on a 1:1 test-system before updating production! while security is important so is speed/availability/uptime/downtime. upgrades especially of kernel and virtualbox need to be […]

there are a lot of service providers where you can rent a virtual server… for example: hetzner, for 3€ per Month you would get 1x CPU core and 2GB of RAM, instead of VPS they also call it “cloud”, it […]

host: hostnamectl Static hostname: CentOS1.localdomain Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 4.14.12 Architecture: x86-64 vboxmanage -v 5.2.6r120293 1. shutdown the guest VM (Windows 7 64Bit) 2. make sure in the settings you have usb […]

headless server: tested: 2018-10-17 on CentOS Linux 7.5 (Core) wget https://www.virtualbox.org/download/oracle_vbox.asc rpm –import oracle_vbox.asc cd /etc/yum.repos.d/ wget https://download.virtualbox.org/virtualbox/rpm/el/virtualbox.repo yum update yum search virtualbox yum install VirtualBox-5.2.x86_64 # if you want/need usb 3.0 extension package wget https://download.virtualbox.org/virtualbox/5.2.20/Oracle_VM_VirtualBox_Extension_Pack-5.2.20.vbox-extpack VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-5.2.20.vbox-extpack […]

who is who? concepts: docker is written in Google Go by Docker Inc, SanFrancisco because it does not emulate any hardware – it is a linux container / sandbox or jail like Free BSD Jail or Solaris Zones or OpenVZ so […]

newer version tutorial howto: Gaming inside GNU Linux Debian 13 via windows-vm? how to get NVIDIA GPU pci-pass-through to kvm vm work pci pass through nic and other hardware directly to vm? theoretically possible, but it’s pretty hard to setup […]

Update: as of 2019-01 and CentOS 7.6 the below setup may fail by now, for those reasons… BUT you CAN compile the latest kernel and all modules yourself (DON’T BE SHOCKED! YOU CAN DO IT! IT’S NOT ROCKET SIENCE!… just […]

this applies to: VirtualBox Version 5.1.8 r111374 (Qt5.3.2) hostnamectl Static hostname: DebianWorkstation Operating System: Debian GNU/Linux 8 (jessie) Kernel: Linux 3.16.0-4-686-pae Architecture: x86 the VMs hangs on startup with this screen: Solution: kill the vm then disable audio device… the […]

What is docker? (src) Docker is the world’s leading software container platform. WARNING! Docker is not really increasing security http://www.sysdig.com/blog/runc-container-escape-vulnerabilities So downloading random containers might be dangerous! Developers use Docker to eliminate “works on my machine” problems when collaborating on […]

who can store more bytes? i created 10GByte partitions for each filesystem. df -TH Filesystem Type Size Used Avail Use% Mounted on udev devtmpfs 505M 0 505M 0% /dev tmpfs tmpfs 104M 5.1M 99M 5% /run /dev/sda1 ext4 133G 34G […]

this seems to be a result of updating VirtualBox without updating the extension… the version of extension and VirtualBox need to match oterhwise this error. VERR_PDM_DEVHLPR3_VERSION_MISMATCH 0x80004005 download the extension matching your version of virtualbox http://download.virtualbox.org/virtualbox/5.1.22/Oracle_VM_VirtualBox_Extension_Pack-5.1.22-115126.vbox-extpack uninstall any older version […]

E_INVALIDARG 0x80070057 Cannot register the DVD image ‘/usr/share/virtualbox/VBoxGuestAdditions.iso’ {b058bc48-c451-4cff-9db0-d01c70e99c28} because a CD/DVD image ‘/usr/share/virtualbox/VBoxGuestAdditions.iso’ with UUID {bb9b13c5-f90f-4589-b212-8b9e01f118f5} already exists. Solution: open the .VBOX file with wordpad: […] <DVDImages> <Image uuid=”{b058bc48-c451-4cff-9db0-d01c70e99c28}” location=”/usr/share/virtualbox/VBoxGuestAdditions.iso”/> […] Delete all entries between <DVDImages> and </DVDImages> lines. After deleting […]

if ssh server is up and secured, it is possible to do so much more with ssh like secure file-transfer of large files (SFTP via FileZilla) or even forward the graphical output of a server-application locally (only that window, not […]

“The heart of the problem is that Hyper-V locks exclusivly the virtualization feature(s) VT-x of the CPU(s), and will not share them with other software. VirtualBox can be configured to play nice (as much as technically possible) but also require […]

Jeder kennt Steve Jobs (now dead) – aber wer kennt schon “Larry” Ellison? 😀 Oracle hat 2010 die Firma “Sun Microsystem aufgekauft” und damit OpenSource Technologie wie Java, VirtualBox und MySQL eingekauft. Lawrence Joseph “Larry” Ellison (born August 17, 1944) […]

right away… as you can see in the logs… it kind of get’s stuck during 00:00:00.810858 Audio: Initializing PulseAudio driver so it has something to do with the Audio-translation from Windows-Guest to Linux-Host. This could also have to do with […]

If you get this error: “VERR_PDM_NO_USB_PORTS” it might be MISSING DRIVERS ON THE GUEST SIDE! 😀 (do NOT blame Oracle or Virtualbox for that) this is how one might get one’s USB Devices to be detected by the Windows Guest […]

check what version of debian you are running: uname -a; lsb_release -a; Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) i686 GNU/Linux No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 8.5 (jessie) Release: 8.5 Codename: jessie 32bit […]

  https://buy.storagecraft.com/StorageCraft-ShadowProtect-for-Small-Business-P150C30.aspx As you can see it pretty much looks like Acronis True Image… even the color Blue is similar. The compression is pretty good. a 7.21Gbyte Windows C Partition is downsized to 3.5 Gbyte in a full backup.   […]