The Systemd system management daemon was designed to replace current init system inherited from UNIX System V operating systems such Linux and thus making current init system obsolete. It this tutorial we will discuss some systemd basics such as how to start or stop service and see service status using systemctl command. Let's start with little bit of information about our systemd version. Use the below systemctl command to determine systemd version:
[root@rhel7 ~]# systemctl --version
systemd 208
+PAM +LIBWRAP +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ

The default settings for the GRUB2 timeout menu selection during the system boot is 5 seconds. To change this value open /etc/default/grub grub default config file. The content of the file looks similar the the one shown below:
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/root crashkernel=auto  \ 
rd.lvm.lv=rhel/swap vconsole.font=latarcyrheb-sun16 vconsole.keymap=us rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

In this showr totorial we will show you how to install VirtualBox Guest Additions on RHEL 7 gnome desktop. To start simply boot to virtual RHEL 7 system. First we will install all prerequisites. To do that open terminal and enter following linux commands:
[root@rhel7 ~]# yum groupinstall 'Development Tools'
as well as we will need kernel development package:
[root@rhel7 ~]# yum install kernel-devel

The default Graphical User Interface for Redhat Enterprise Linux 7 server is Gnome. If from some reason you have decided to install KDE Desktop or to switch from a RHEL7's default GUI gnome to KDE this short tutorial will provide you with easy to follow steps.

Installation of KDE desktop manager on RHEL 7

Here we assume that you currently do not have any desktop manager installed on your system. To install KDE desktop manager on RHEL 7 execute below command:
[root@rhel7 ~]# yum groupinstall 'X Window System' 'KDE'

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