Category: virtualbox / Virtualization / xenserver

CentOS7 setup virtualbox

1. su; # become root mkdir /software; cd /software; wget rpm -i VirtualBox-5.2-5.2.6_120293_el7-1.x86_64.rpm; # install # that easy in order to use anything faster than USB 1.1 you will need to install the extension pack. wget go […]


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. For example […]


it is pretty cool… a 32Bit Linux Host can run a 64Bit Linux guest. NICE 😉 i assume you have a working CentOS7 basic installation and are root. tested on/with: tested with: Host: Debian 8 Jessie and CentOS7 Operating System: […]

VirtualBox under LinuxDebian – Hang Hung VM on Starting Virtual Machine

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 […]

debian 9 stretch – howto setup docker container software

What is docker? (src) Docker is the world’s leading software container platform. Developers use Docker to eliminate “works on my machine” problems when collaborating on code with co-workers. Operators use Docker to run and manage apps side-by-side in isolated containers […]


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 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 […]


„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 […]

Was macht eigentlich ORACLE?

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) […]

24.04.2016 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.   […]


first you will have to share the folder (Machine -> Settings -> Shared Folders -> Click on the green Plus on the right side) mkdir /mnt/DATA; # create mount point mount -t vboxsf DATA /mnt/DATA; # mounts the shared folder […]


this was tested on: Linux laptop (Core2Duo T2050) 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt11-1 (2015-05-24) i686 GNU/Linux apt-get install linux-headers-$(uname -r); # install linux header files aptitude update; # aptitude can resolve conflicts better than apt alone aptitude install libssl0.9.8 libpython2.6; […]


Climate Change is affecting all of us. -> „How do we get more detailed information?“ Computer Simulation -> Projects Since was launched the combined computing power of its users has allowed scientists to carry out […]


i have the following problem… since i updated VirtualBox to 4.3.30, using USB 2.0 will make the VM crash. so i thought, maybe i should update the „extension pack“ responsible for giving the VM USB 2.0 support also an upgrade […]


usually it works like this… you setup a Template (like basic WindowsXXX or Linux installation (like a stem cell)) and clone this template for various purposes (spezialize on…). in KVM it looks like this: (WHICH IS TOTALLY CONFUSING FOR ME) […]


gui-way: DO NOT USE ANY OTHER HARDDISK FORMAT THAN THE DEFAULT QCOW2!!! with VirtualBox it’s the same. THEORETICALLY they support Micro$oft’$ HYPER_V_DISK_IMAGE.VHD BUT PRACTICALLY THINGS WILL FALL APART QUICKLY! (broken/corrupted disk image) So just stick to the defaults and you […]