GuestAdditions do not work in CentOS-VM

Hanisch · 11-14-2020, 06:38 AM

Hello,

in my CentOS 8 installation in a VirtualBox 6.1.16 the GuestAddition (Shared-folder and bidirectional clipboard) do not work.
I have installed GuestAdditions in /opt/VBoxGuestAdditions-6.1.16.

Code:

$ sudo mount -t vboxsf -o rw,uid=1000,gid=1000 transfer /home/opa/Shared_transfer
mount: /home/opa/Shared_transfer: Falscher Dateisystemtyp, ungültige Optionen, der Superblock von transfer ist beschädigt, fehlende Kodierungsseite oder ein anderer Fehler.

What is the reason for that?

with regards
Ch. Hanisch

michaelk · 11-14-2020, 09:00 AM

I have CentOS 8 running in a VirtualBox VM with guest additions installed and both shared folders / clipboard work fine. Have you verified the vboxsf module is loaded? Check the output of the lsmod command and that there is a vboxsf filesystem.

Code:

Module                  Size  Used by 
vboxsf                 86016  0
vboxguest             385024  7 vboxsf

cat /proc/filesystems | grep vboxsf

Code:

nodev	vboxsf

Is your transfer share a temporary or permanent share?

Hanisch · 11-15-2020, 04:55 AM

Quote:

Originally Posted by michaelk

... Check the output of the lsmod command and that there is a vboxsf filesystem.

Code:

Module                  Size  Used by 
vboxsf                 86016  0
vboxguest             385024  7 vboxsf

Quote:

cat /proc/filesystems | grep vboxsf

Code:

nodev	vboxsf

That is Ok.

Code:

$ lsmod
...
vboxguest        385024  0
...
$ sudo modprobe vboxsf
$ lsmod
...
vboxguest        385024  1 vboxsf
...
$ sudo modprobe vboxdrv
modprobe: FATAL: Module vboxdrv not found in directory /lib/modules/4.18.0-193.28.1.el8_2.x86_64

No explicite entry for vboxsf
How can I activate vboxsf?

with regards
Ch. Hanisch

Hanisch · 11-15-2020, 06:39 AM

Hello,
>How can I activate vboxsf?

The solution is the execution of following skript:

Code:

$ cat ~/usr/VBoxadd-setup
cd /opt/VBoxGuestAdditions-*/init  
sudo ./vboxadd setup

# Oder auch:
sudo modprobe -a vboxguest vboxsf vboxvideo

Now all is Ok.

Code:

$ lsmod
Module                  Size  Used by
vboxsf                 86016  2
...
vboxguest             385024  5 vboxsf

with regards
Ch. Hanisch