==== VirtualBox General Notes ====

If new kernel on host machine Rocky Linux 9 causes failure to start VirtualBox VMs, ensure the following kernel RPMs are installed:

  kernel
  kernel-core
  kernel-devel
  kernel-devel-matched
  kernel-headers
  kernel-modules
  kernel-modules-core
  kernel-modules-extra


Check version of installed Guest Additions:

  modinfo vboxguest


Running VirtualBox as a service on Windows:  [[http://techgenix.com/start-virtualbox-service/]]

  C:\Program Files\Oracle\VirtualBox>VBoxManage.exe clonehd --format VDI "C:\Users\Chris\VirtualBox VMs\centos7-vtatdb2-w\CENTOS7-vtatdb2-disk001.vmdk" "C:\Users\Chris\VirtualBox VMs\centos7-vtatdb2-w\CENTOS7-vtatdb2-disk001.vdi"

__How to convert VMDK to VDI__\\

See notes at https://www.bonusbits.com/wiki/HowTo:Convert_VMDK_to_VDI

__How to resize a Virtual Drive__\\
  * The following was tested with VBox 5.1.26
  * Shutdown the VM you want to resize
  * Navigate to the .vdi file you want to resize
  * Make a backup copy of the .vdi file
  * Run a command like this (example for 30GB drive)

  # VBoxManage modifyhd /path/to/file.vdi --resize 30000
  
Note, if you have a vmdk file you need to follow this [[https://stackoverflow.com/questions/11659005/how-to-resize-a-virtualbox-vmdk-file|(see this link)]] and then update the UUID following [[https://stackoverflow.com/questions/17803331/how-to-change-uuid-in-virtual-box|this link]] or navigating to $HOME/.VirtualBox/VirtualBox.xml and updating the information there (make a backup first):

  # VBoxManage clonehd "source.vmdk" "cloned.vdi" --format vdi
  # VBoxManage modifyhd "cloned.vdi" --resize 51200
  # mv source.vmdksource.vmdk.BAK 
  # VBoxManage clonehd "cloned.vdi" "source.vmdk" --format vmdk

  * Start VirtualBox manager
  * Highlight the VM whose disk you are resizing
  * Click Settings and then click storage
  * Mount a virtual CDROM (gparted-live ISO that you downloaded to the host machine)
  * Start the VM
  * Start Gparted LIVE
  * Follow the menus to resize the partition that you need to make larger
    * Select the partition you want to edit/resize and manipulate accordingly 
  * When done, exit Gparted and unmount the CDROM
  * Boot the VM and verify your changes were implemented
  * Ref 1: https://forums.virtualbox.org/viewtopic.php?f=35&t=50661\\
  * Ref 2: http://derekmolloy.ie/resize-a-virtualbox-disk/\\

__Possible mouse unresponsiveness issue in 5.1.18__
https://forums.virtualbox.org/viewtopic.php?f=3&t=79034

__Running in Headless Mode__\\

# List virtual machines\\
VBoxManage list vms\\
"MyVM" {e4b0c92c-4301-4a7d-8af8-fe02fed00451}

# Start VM in headless mode\\
VBoxManage startvm MyVM --type headless

# Power off VM\\
VBoxManage controlvm MyVM poweroff

[[http://jez.me/article/how-start-virtualbox-vm-headless-windows-10|Run VirtualBox Headless at Startup in Windows 10]]

**February 2015**

//Updated October 2016 for wodim issues//

Installing Guest Additions in run-level 3 on CentOS6, CentOS7, CentOS8 Stream:
  * https://linuxconfig.org/how-to-mount-cdrom-in-linux
  * First, go to the VirtualBox window that is running the guest machine and choose Devices > Insert Guest Additions CD Image
  * From a separate terminal window (via ssh) or in the VM window itself, su - root
  * yum install cdrecord
  * wodim --devices
    * (note the drive designation)
      * If that command fails on a CENTOS7 v7.2.1511 VirtualBox instance, try: wodim dev=/dev/sr0 --devices
      * If that succeeds, it should say something like 'VBOX'  'CD-ROM'
      * Or: wodim -prcap (although that doesn't seem to give you the info needed)
      * See [[https://bugs.launchpad.net/ubuntu/+source/cdrkit/+bug/1203559]]
  * mkdir /media/cdrom 
  * mount -t iso9660 /dev/scd0 /media/cdrom
    * if you used "sr0" above, substitute sr0 for scd0 in the line above
  * cd /media/cdrom
  * Then run Linux version of script
    * Ex: sh VBoxLinuxAdditions.run
  * When done, cd / and eject and reboot
__
Updated 18 March 2019__\\
  * https://www.if-not-true-then-false.com/2010/install-virtualbox-guest-additions-on-fedora-centos-red-hat-rhel/