===== Virtualbox =====

=== Hardware Virtualization ===
Hardware Virtualization (alias VT-X - a command Set of the CPU) is required for virtual machines.

== on MSI Mainboard ==

Enabling it is hidden within 
<code>
Overclocking > CPU Features > Inter Virtualization Technology
</code>

**ACHTUNG:** "CPU Features" IS FUCKING ONLY AVAILABLE IN "STANDARD MODE" - NOT IN "ECO MODE"

{{https://lh3.googleusercontent.com/-tbZpzosm5_8/Wqpj6zIVVrI/AAAAAAAAAFM/lyMkyhGs8tEiFW1-1Yu7DdkMO9iM2Jq4QCHMYCw/s0/2018-03-15_13-15-36.png?800}}

== on HP Notebook ==

{{https://lh3.googleusercontent.com/-g7MYwCe8tMg/WqpjjMM8ozI/AAAAAAAAAFI/r4cjlnQE2AYv5iNkJ5eMy6qM5aRN12UFACHMYCw/s0/2018-03-15_13-14-00.png}}
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== DeviceGuard ==

"DeviceGuard" also blocks the VT-x feature,
which causes the "VERR_VMX_NO_VMX" message by VirtualBox or Vagrant.

You can check, whether DeviceGuard is running under SystemInformation. Search for:
"DeviceGuard Virtualization: Running"

{{https://docs.microsoft.com/en-us/visualstudio/cross-platform/tools-for-cordova/tips-workarounds/media/android-tips/device-guard.png}}

You can disable it, via "gpedit.msc", 
setting "Computer Configuration\Administrative Templates\System\Device Guard\Turn On Virtualization Based Security" to "Disabled".

{{https://www.tenforums.com/attachments/tutorials/108861d1485973713-enable-disable-device-guard-windows-10-a-device_guard_gpedit-1.png}}

Additionally you can set "bcdedit /set hypervisorlaunchtype off"

  * https://arstechnica.com/civis/viewtopic.php?f=8&t=1423473
  * https://forums.virtualbox.org/viewtopic.php?f=38&t=86399



You can check, whether the device guard is running under 



== Device Guard and Credential Guard hardware readiness tool ==
You can use the tool to disable the DeviceGuard.

Use the **Device Guard and Credential Guard hardware readiness tool** from Microsoft to disable the credential guard:
https://www.microsoft.com/en-us/download/details.aspx?id=53337

Run Powershell as administrator and follow this steps:

To verify DG/CG is enabled: 
<code>DG_Readiness_Tool_v3.6 -Ready</code>

To disable DG/CG: 
<code>DG_Readiness_Tool_v3.6 -Disable</code>

and restart the PC.

If Powershell can't execute the script, first try to set the execution policies unrestricted with this just typing:

<code>Set-ExecutionPolicy Unrestricted</code>

Try again to execute the script and restart the PC.




=== Resolution ===

How to customize Virtual box resolution is written here: http://www.virtualbox.org/manual/ch09.html

<code>
VBoxManage.exe setextradata "Windows8" CustomVideoMode1 1680x1050x32
VBoxManage.exe setextradata global GUI/MaxGuestResolution any
</code>


=== Release Disk space ===
The dynamic disk occupies XGB of real disk space, once there tehre were XGB of Data. \\
But the virtualdisk does not automatically release diskpace. \\
To release diskspace do:
- Disk defragmentation inside of the virtual machine
- use [[ http://technet.microsoft.com/en-us/sysinternals/bb897443.aspx | sdelete.exe ]] tool to delete unneeded blocks
<code>
sdelete.exe -z
</code>

- use vmbox toolkit to compact the disk
<code>
VBoxManage modifyhd "X:\Virtual Machines VirtualBox\VirtualboxHdd.vdi" --compact
</code>


=== Running Virtualbox as a VBoxHeadlessTray===
http://www.toptensoftware.com/VBoxHeadlessTray/

Use the vboxvmservice tool to run Virtual Machines as a service!




=== Network ===
The Network woks if set to **Networkbridge**