The wc command on Linux is short for word count. It’s a simple tool that does exactly as its name would imply: count the number of words in a file. It can also count similar things, like the number of characters in a file, the number of lines, and the number of bytes.
Luke Reynolds
Configuring VNC Server Access on a Redhat Linux
Most of the time as a Linux system administrator you are managing your servers over the network. It is very rare that you will need to have a physical access to any of your managed servers. In most cases all you need is to SSH remotely to do your administration tasks. In this article we will configure a GUI alternative to a remote access to your RHEL server, which is VNC. VNC allows you to open a remote GUI session to your server and thus providing you with a full graphical interface accessible from any remote location.
In this tutorial you will learn:
- How to install required VNC packages
- How to setup and start the VNC server on RHEL
- How to connect to a graphical session remotely
- How to run graphical programs in the xterm session
Basic Linux Kernel module administration commands
The kernel of a Linux system is the core that everything else in the operating system relies on. The functionality of the kernel can be extended by adding modules to it. As such, a user can fine tune their kernel settings by enabling or disabling modules. This level of granular control is one of the many reasons why users love Linux in the first place.
In this guide, we’ll go over some of the most essential kernel module administration commands on Linux. Knowing these commands will help you understand the components that have been loaded into your system’s kernel, and will also allow you to load, reload, or unload modules in the system kernel.
In this tutorial you will learn:
- How to administer kernel modules on Linux with commands
Creating a Redhat package repository
If your Red Hat server is not connected to the official RHN repositories, you will need to configure your own private repository which you can later use to install packages. The procedure of creating a Red Hat Linux repository is quite a simple task. In this article, we will show you how to create a local file Red Hat repository as well as a remote HTTP repository.
In this tutorial you will learn:
- How to use official Red Hat DVD as repository
- How to create a local file Red Hat repository
- How to create a remote HTTP Red Hat repository
Learning Linux Commands: awk
In the case of this article, the Learning Linux Commands: awk title might be a little misleading. And that is because awk is more than a command, it’s a programming language in its own right. You can write awk scripts for complex operations or you can use awk from the command line. The name stands for Aho, Weinberger and Kernighan (yes, Brian Kernighan), the authors of the language, which was started in 1977, hence it shares the same Unix spirit as the other classic *nix utilities.
If you’re getting used to C programming or know it already, you will see some familiar concepts in awk, especially since the ‘k’ in awk stands for the same person as the ‘k’ in K&R, the C programming bible. You will need some command-line knowledge in Linux and possibly some scripting basics, but the last part is optional, as we will try to offer something for everybody. Many thanks to Arnold Robbins for all his work involved in awk.
In this tutorial you will learn:
- What does
awkdo? How does it work? awkbasic concepts- Learn to use
awkthrough command line examples
Linux IP forwarding – How to Disable/Enable using net.ipv4.ip_forward
It may be necessary to configure Linux IP forwarding on a Linux system in certain scenarios. If the Linux server is acting as a firewall, router, or NAT device, it will need to be capable of forwarding packets that are meant for other destinations (other than itself).
Docker container: Backup and Restore
The purpose of this guide is to go over the step by step instructions of how to back up a Docker container on the Linux command line. We’ll also show how to restore a Docker container from backup. This can be done on any Linux system where Docker is installed, and will work on any Linux distribution.
To understand the Docker container backup and recovery process we first need to understand the difference between a Docker image and a Docker container. A Docker image contains an operating system with possibly one or more preconfigured applications, whereas a Docker container is a running instance created from an image.
In this tutorial you will learn:
- How to back up a Docker container on Linux
- How to restore a Docker container on Linux
Basic networking example on how to connect docker containers
One of the many desirable features built directly into Docker is networking. Docker’s networking feature can be accessed by using a --link flag which allows to connect any number of Docker containers without the need to expose a container’s internal ports to the outside world.
In this guide, you will learn how to network two or more Docker containers together on a Linux system through command line instructions. This will work on any Linux distribution. Check out the step by step instructions below to find out how.
In this tutorial you will learn:
- How to network Docker containers together
How to remove all docker containers using a single command
In this guide, we will show command line examples for removing all Docker containers from a Linux system. This will work on any Linux distribution.
Along with removing Docker containers, you’ll also learn how to remove Docker images, volumes, and networks. This is useful when you want to completely purge all traces of containers from your Docker installation and start fresh. Check out the examples below to find out how.
In this tutorial you will learn:
- How to list, stop, and remove all Docker containers
- How to remove Docker images, volumes, and networks
How to share data between a Docker container and host system using volumes
The easiest way to share data between a Docker container and the host system is to use Docker’s volumes. In this guide, we will go through the step by step instructions of sharing files between a Docker container and host system using Docker volumes via the command line on Linux.
Docker volumes work similarly to bind mounts, but are the preferred method for sharing data between a host system and Docker container because outside applications are not able to access the files and modify them.
In this tutorial you will learn:
- How to use volumes to share data between a Docker container and host system
How to install Docker on Fedora Linux system
Docker is a tool that is used to run software in a container. It’s a great way for developers and users to worry less about compatibility with an operating system and dependencies because the contained software should run identically on any system.
Docker is available for download and installation on Fedora as well as most other distributions of Linux. However, installing it on Fedora can be a bit tricky because Red Hat doesn’t offer native support for Docker on its distributions. Instead, Red Hat pushes support for Podman, an alternative to Docker. This makes Docker a bit harder to install, but it’s still possible on Fedora.
In this guide, we’ll show you how to install Docker on Fedora and get started with installing containerized software. After Docker is installed, you can use it to install software packages much the same way you would use your distro’s package manager to download an app. The difference of using Docker is that everything is more automated, with compatibility and dependencies no longer being potential issues.
In this tutorial you will learn:
- How to install Docker
- How to start Docker and make it run automatically at boot
- How to run Docker without root
- How to search for a Docker image
- How to install a Docker image
- How to run a Docker image
- How to monitor Docker with various commands
- How to automatically start a Docker container
NVIDIA GeForce Driver Installation on Fedora Linux 64-bit
The NVIDIA Driver is a program needed for your NVIDIA Graphics GPU to function with better performance. It communicates between your Linux operating system, in this case Fedora, and your hardware, the NVIDIA Graphics GPU.
The NVIDIA drivers can be installed by using a Bash command after stopping the GUI and disabling the nouveau driver by modifying the GRUB boot menu.
To install Nvidia driver on other Linux distributions, follow our Nvidia Linux Driver guide.
In this NVIDIA Drivers installation guide you will learn:
- How to install NVIDIA graphic driver automatically using RPM Fusion and manually using the official NVIDIA driver from nvidia.com
- How to identify your NVIDIA graphic card model on your operating system
- Where to download the NVIDIA driver package for Fedora Linux
- How to install prerequisites for a successful Nvidia Driver compilation and installation on Fedora Linux
- How to disable the nouveau driver
- How to successfully install NVIDIA Drivers on your Fedora Linux operating system.