For new installation of RHEL 7 ,GUI doesn’t come with default installation. If you do not click on the “Software Selection” link and pick “server with GUI” then there will be no GUI after reboot, only “Base Environment ” will be installed.

To enable GUI after system installation, you can use following method.

Installing the […]

Previous versions of Oracle Linux use init scripts located in the /etc/rc.d/init directory to start and stop services. In RHEL 7, these init scripts have been replaced with systemd service units. Service units have a .service extension. Use the systemctl command to list all loaded service units:

# systemctl list-units –type service –all UNIT LOAD […]

Group administration

– Use the groupadd command to add a new group :

# groupadd [options] group_name – Use the groupmod command to modify an existing group :

# groupmod [options] group_name – Use groupdel to delete the group. You can remove a group even if there are users in the group. But you can […]

SELinux modes

SELinux gives that extra layer of security to the resources in the system. It provides the MAC (mandatory access control) as contrary to the DAC (Discretionary access control). Before we dive into setting the SELinux modes, let us see what are the different SELinux modes of operation and how do they work. SELinux […]

Introduction

– A packet filtering firewall reads incoming network packets and filters (allows or denies) each data packet based on the header information in the packet. The Linux kernel has built-in packet filtering functionality called Netfilter. – Two services are available in RHEL 7 to create, maintain, and display the rules stored by Netfilter: 1. […]