Add 'VirtualBox.md'

VirtualBox.md

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+# VirtualBox
+
+(https://www.virtualbox.org)
+
+## Installation
+
+```sh
+apt install virtualbox virtualbox-dkms virtualbox-ext-pack virtualbox-guest-additions-iso virtualbox-qt
+```
+
+## Status
+
+```sh
+VBoxManage list vms
+VBoxManage list runningvms
+```
+
+## Start vms
+
+```sh
+VBoxManage startvm "Rocky Linux"  --type=headless
+```
+
+
+## Stop vm
+
+```sh
+VBoxManage controlvm SlackDB poweroff soft
+```
+
+## Export / Import
+
+```sh
+VBoxManage export SlackDB --output SlackDB.ova   # export
+VBoxManage import SlackDB.ova                    # import
+```
+
+## Extend disk
+
+```sh
+VBoxManage modifyhd slack.vdi --resize 102400    # MB
+#  16 GB =  16384 MB
+#  32 GB =  32768 MB
+#  48 GB =  49152 MB
+#  64 GB =  65536 MB
+#  80 GB =  81920 MB
+# 100 GB = 102400 MB
+```
+
+## Convert to KVM
+
+```sh
+VBoxManage clonehd --format RAW <vdisk-name>.vdi <vdisk-name>.img
+qemu-img convert -f raw <vdisk-name>.img -O qcow2 <vdisk-name>.qcow2
+```