TL;DR: Install Guest Additions, set shared folder and mount it.
Install Guest Additions
VirtualBox Guest Additions are software which enable seamless integration between the host and guest systems. It provides features including mouse pointer integration, Drag’n’Drop functionality, shared clipboard, shared folders and more.
Take CentOS as an example, we can install it via two methods. Before that, we first config the environment.
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# enable EPEL repository
$ yum -y install epel-release
# update package
$ yum -y update
# install kernel headers, develper tools and other related packages
$ yum install make gcc kernel-headers kernel-devel perl dkms bzip2
# set KERN-DIR environment variable
$ export KERN_DIR=/usr/src/kernels/$(uname -r)
Command
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# mount -r /dev/cdrom /media
# cd /media/
# ./VBoxLinuxAdditions.run
GUI
Click on Devices-Insert Guest Additions CD Image. A dialog window will pop up, click on the Run to excute it.
Set shared folder
This process need GUI. If your system is minimal, GUI can be installed through following command.
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$ yum groupinstall "GNOME Desktop" [On CentOS 7]
$ yum groupinstall "Server with GUI" [On RHEL 7]
Click on Devices-Shared Folders, set the folder you want to share with virtual machine and set its name.
Mount the folder
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$ sudo mount -t vboxsf [HOST_SHARED_FOLDER_NAME] [VIRTUAL]
Reference [1]https://www.tecmint.com/install-virtualbox-guest-additions-in-centos-rhel-fedora/ [2]https://www.tecmint.com/install-gui-in-rhel-centos-7/
