VirtualBox : Install GuestAdditions2021/06/09

	Install [GuestAdditions] into a Virtual Machine to improve Virtual Machine's System Performance. On the example below, it shows to install [GuestAdditions] on a Virtual Machine [CentOS_ST8].
[1]	Attach [GuestAdditions]' disk to the VM on VirtualBox Host. The target VM must be stopped.

[root@dlp ~]#

VBoxManage storageattach CentOS_ST8 \
--storagectl CentOS_ST8_SATA \
--port 0 \
--type dvddrive \
--medium /usr/share/virtualbox/VBoxGuestAdditions.iso

[2]	Start the VM and login to it, then Install [GuestAdditions] on it.

# install required packages first

[root@guest ~]#

dnf -y upgrade kernel

[root@guest ~]#

dnf -y install gcc make bzip2 kernel-devel elfutils-libelf-devel

[root@guest ~]#

reboot

[root@guest ~]#

mount /dev/cdrom /mnt

[root@guest ~]#

cd /mnt

[root@guest mnt]#

./VBoxLinuxAdditions.run

[root@guest mnt]#

reboot

[3]	After installing [GuestAdditions], System Performance will be improved.

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