Guest Additions are installed without dkms support

[breakpointninja]

If the guest linux kernel version gets updated then Vagrant fails to mount host directories. This is because the kernel module vboxsf was compiled for an older version of the kernel.
This gets fixed after installing dkms and then reinstalling guest additions.
yum install dkms

It would be much more convenient if guest additions were compiled from the start with dkms support.

Example error:

Failed to mount folders in Linux guest. This is usually because
the "vboxsf" file system is not available. Please verify that                                                                                                                                        
the guest additions are properly installed in the guest and                                                                                                                                          
can work properly. The command attempted was:                                                                                                                                                        

mount -t vboxsf -o uid=`id -u vagrant`,gid=`getent group vagrant | cut -d: -f3`,dmode=777,fmode=666 db_data /db_data                                                                                 
mount -t vboxsf -o uid=`id -u vagrant`,gid=`id -g vagrant`,dmode=777,fmode=666 db_data /db_data                                                                                                      

The error output from the last command was:                                                                                                                                                          

/sbin/mount.vboxsf: mounting failed with the error: No such device

[juliandunn]

So the reason the boxes are set up this way is to keep their size down. Otherwise you need a whole C compiler, make, etc. on the box which is undesirable.

Generally, the use cases for the Bento boxes are for userland testing, which are generally agnostic to the kernel version.

[ghost]

You could alternatively use veewee for they compile Guest Additions with dkms.

[juliandunn]

Or just maintain a fork if you don't like how we set up these boxes 😁

I'm closing this because it's "by design".

[breakpointninja]

Thanks. I will go ahead and try veewee.