This article will provide you with an information on how to install kernel source on CentOS/RHEL Linux system. Alternatively it will guide you through a simple troubleshootng process in case you have already installed kernel sources/headers and yest still receiving the bellow error message:
  ERROR: Unable to find the kernel source tree for the currently running kernel.  Please make sure you have installed the kernel     
         source files for your kernel and that they are properly configured; on Red Hat Linux systems, for example, be sure you have 
         the 'kernel-source' or 'kernel-devel' RPM installed.  If you know the correct kernel source files are installed, you may    
         specify the kernel source path with the '--kernel-source-path' command line option.

In this tutorial you will learn:
  • How to kernel-headers
  • How to kernel-devel
  • How to check kernel version
  • How to check for installed kernel-devel version

Disk partitions are the basis of storing our data on disks. To be able to handle partitions, in this part of RHCSA exam preparation tutorial we will add an empty disk to our test RHEL 8 system, and create, list, and delete a new partition on it. First we will use the classic MBR (Master Boot Record) setup, then we'll do the same on GPT (GUID Partitioning Table) setup. GPT is a more advanced partitioning technique that allows large partitions, whereas MBR is limited to 2 TB disk space per partition. So if that doesn't seem like a very limiting size at the moment, think of the trend of disk usage, which may be not that much from the end user perspective, but certainly it is from the Linux system administration job perspective.

In this tutorial you will learn:
  • How to create a new MBR partition using fdisk
  • How to list classic partitions using fdisk
  • How to delete partition using fdisk
  • How to create GPT partition using gdisk
  • How to list GPT partitions
  • How to delete GPT partitions

The objective is to install the GIMP on CentOS 8 / RHEL 8 Linux. GIMP is a raster graphics editor used for image editing, free-form drawing, converting between different image formats and more.

In this tutorial you will learn:
  • How to install GIMP

The objective is to install the VLC media player by using both, EPEL and RPM fusion repositories on CentOS 8 / RHEL 8 Linux. VLC media player is a portable cross-platform media player software and streaming media server developed by the VideoLAN project.

In this tutorial you will learn:
  • How to add EPEL repository
  • How to enable RPM fusion
  • How to install VLC

The objective is to mount a CD/DVD block device with ISO 9660 disk image/media.

In this tutorial you will learn:
  • How to detect CD/DVD block device
  • How to create mount point
  • How to mount CD/DVD
  • How to unmount CD/DVD

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