- 1. VirtualBox Guest Addtion on CLI
- 2. Optimize VirtualBox VM Disk Space
- 3. Troubleshooing VirtualBox VM
1. VirtualBox Guest Addtion on CLI
- Mount Guest Addtion ISO (from Console Menu)
- Mount it from OS (/vmboxguestiso is destination mount point)
mount /dev/cdrom /vmboxguestiso/
- Resolve Dependancies
Install kernel-header
`sudo yum update && sudo yum -y install kernel-headers kernel-devel`
## install other packages
yum install gcc make perl
2. Optimize VirtualBox VM Disk Space
- Clean up inside the VM
$ sudo dnf clean all
$ sudo journalctl --vacuum-time=7d
$ sudo rm -rf /var/cache/*
$ sudo rm -rf ~/.cache/*
- Zero out the free space
$ sudo dd if=/dev/zero of=/zerofile bs=1M
dd: error writing '/zerofile': No space left on device
107617+0 records in
107616+0 records out
112843751424 bytes (113 GB, 105 GiB) copied, 127.059 s, 888 MB/s
$ sudo rm -f /zerofile
- Shutdown the VM
$ sudo shutdown -h now
- Run VBoxManage to compact the disk
VirtualBox does not support compacting .vmdk disks directly. Convert your .vmdk disk to .vdi, compact it, and then continue using the compacted disk.
$ VBoxManage clonehd \
"/path/to/vm-folder/aap25-rhel92-1/generic-rhel9-virtualbox-disk001.vmdk" \
"/path/to/vm-folder/aap25-rhel92-1/aap25-compact.vdi" \
--format VDI
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Clone medium created in format 'VDI'. UUID: 6517df59-9cd0-4393-bb03-c5d182219cc3
Now run the compact vdi command.
$ VBoxManage modifymedium "/home/gmadappa/VirtualBox VMs/aap25-rhel92-1/aap25-compact.vdi" --compact
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
3. Troubleshooing VirtualBox VM
3.1. Unable to mount Shared folders in CLI
Check vboxsf module
sudo modprobe vboxsf
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