NOTES

VirtualBox related stuffs

Setting Video Memory, Base Memory, and CPU

Sometimes, you need to change Base Memory and CPU, depending on your system load. From command line,

VBoxManage modifyvm "VM_Name" --vram 256 --memory=4096 --cpus=2

Loading Guest Addition

1. Update to the latest. Install packages for compiling kernel modules.

   Ubuntu:

    sudo apt update
    sudo apt dist-upgrade
    sudo apt install build-essential dkms
   

   Fedora:

    sudo dnf distro-sync
    sudo dnf install kernel-devel kernel-headers dkms
   

   OpenSUSE:

    sudo zypper refresh
    sudo zypper dist-upgrade
    sudo zypper install kernel-devel
   

2. Install Guest Additions. Add user to group vboxsf if you’ve configured “Shared Folders”.

   sudo /.../VBoxLinuxAdditions.run
   sudo usermod -a -G vboxsf "user"
   

3. Reboot to pickup new kernel modules and new group id.

   sudo reboot
   

Compacting disk (not for BTRFS):

1. Remove all snapshots of the VM.

2. From guest OS, fill all available disk space with zeros.

   cp /dev/zero z; sync    # fill with zeros
   rm z; sync              # leaving the zeros on disk
   poweroff
   

3. From host OS, compact the disk.

   VBoxManage modifymedium "file.vdi" --compact