# 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
```

## Shrink VM disk

```sh
# on host
dd if=/dev/zero of=/var/tmp/bigemptyfile bs=4096k ; rm /var/tmp/bigemptyfile
shutdown

# on server
VBoxManage modifymedium --compact /path/to/thedisk.vdi
```

## 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
```

## Bash alias

```sh
alias vm='VBoxManage list vms && echo -e '\n' &&  VBoxManage list runningvms'
alias vmstart='VBoxManage startvm "Rocky Linux"  --type=headless'
alias vmstop='VBoxManage controlvm "Rocky Linux" poweroff soft'
```

`source ~/.bashrc`