Mount shared folder on CentOS in VirtualBox

shared_folder_centos_virtualbox.txt

# The VirtualBox documentation[1] for how to install guest additions 
# for Linux on a virtual host is somewhat messy. So here is what 
# I did to make it work.

# Install the packages required (You must have internet on the CentOs machine)
yum update
yum install tar bzip2 kernel-devel make gcc elfutils-libelf-devel

# Click: Devices/Insert Guest Additions CD Image

# Mount the ISO image with the guest additions
mkdir /cdrom
mount /dev/cdrom /cdrom

# Install guest additions
/cdrom/VBoxLinuxAdditions.run

# If you see a message like:
    # VirtualBox Guest Additions: Kernel headers not found for target kernel 
    # 4.18.0-147.el8.x86_64. Please install them and execute
    #   /sbin/rcvboxadd setup
# Then you have a mismatch between kernel and kernel-devel versions. One way to solve it is to update the kernel
    # yum install kernel
    # reboot
# Then remount and install guest additions
    # mount /dev/cdrom /cdrom
    # /cdrom/VBoxLinuxAdditions.run
# If you did not see the previous message, you can skip updating the kernel.

# Share a folder from the VirtualBox control panel, giving it a share name.

# You can access the shared folders using: (replace <share_name> with the name of your share)
cd /media/sf_<share_name>


# You could always mount the directory yourself as well
# (replace <folder_name> with the name you want to use to access the share. You can use any legal, not existing name)
# (replace <share_name> with the name of your share)
mkdir ~/<folder_name>
mount -t vboxsf <share_name> ~/<folder_name>
cd ~/<folder_name>

# Optional: unmount and remove "/cdrom" folder
umount /cdrom
rm -rf /cdrom


[1] http://www.virtualbox.org/manual/ch04.html