In this tutorial you will learn how to test internet connection on Linux operating system. When we talk about the internet connection usually this for everybody means different thing. Meaning, you might be connected to the Internet but unable to browse any web sites.

In this tutorial you will learn:
  • How to test internet connection
  • How to test DNS resolution
  • How to test Local Area network
  • How to check your DNS resolution

Fsarchiver is a free software utility that let us create file-level backups of one or multiple filesystems in a single archive. One big advantage of this kind of backup is that we can restore it on a filesystem smaller than the original one (but of course large enough to contain all the files); this is usually impossible when performing block-level backups, using tools like partclone or dd. In this article we will learn how to install and use the application and its main features.

With the use of virtual hosts we can make an httpd server manage multiple websites. We can use both IP and name-based virtual hosts; what are the differences between them?

How Apache decides what of the virtual hosts should be used to respond to a client request? We will answer these questions in this article, keep reading!

LEDE/OpenWRT is a Linux-based operating system which can be used as an alternative to proprietary firmwares on a wide range of routers.

Installing it provides increased security, let us tweak our router and give us a wide range of software packages to install from the system repositories.

Installing packages is very easy, thanks to the opkg package manager, but often the available space on common routers is quite limited. In this tutorial we will see how to extend the available system space using an USB device.

The "developer edition" is a special version of the Mozilla Firefox web browser tailored for web developers. It has features stabilized in nightly builds, provides experimental developer tools, and it is configured for development, so some options as remote debugging, are enabled by default.

The browser creates and uses a separate profile, so it can be used together with the standard edition of Firefox (on Linux, profiles are created inside the ~/.mozilla directory).

In this tutorial we will see how to install Firefox Developer Edition on Linux, how to add the application to our PATH, and how to create a desktop launcher for it: the instructions can be applied to any Linux distribution.

In this tutorial you will learn:
  • How to download and install Firefox developer edition
  • How to add the Firefox binary to PATH
  • How to create a launcher for the application

The RAM usage on a system is good to know for a few reasons. Firstly, it can give you some insight into whether or not it’s necessary to upgrade the amount of memory inside your server or computer. If you see the memory utilization regularly nearing full capacity, it could indicate that your system needs an upgrade.

On the other hand, it can also help you track down problems on a system. A spike in memory usage can indicate an issue with a process running on the computer. In this tutorial for Linux administrators, we’ll go over a few methods to check and monitor the RAM usage on Linux.

In this tutorial you will learn:
  • How to check RAM usage with free
  • Monitoring ongoing RAM usage with free
  • How does free work?
  • How to check RAM usage with top
  • How to check RAM usage with htop

Everything that’s running on a Linux system – a service, script, or anything else – is considered a “process.” If you need to end a running process on Linux, the kill command is sure to do the job.

In this guide for Linux administrators, we’ll go over the kill Linux command and how to use its various options to end, or “kill,” a running process on Linux.

In this tutorial you will learn:
  • How does the kill command work?
  • How to see what processes are running
  • How to kill a process by PID
  • How to kill a process that refuses to close
  • How to kill a process by name

As a Linux administrator, it’s important to keep an eye on how your server (or servers) is performing. One way to measure its performance is to track the CPU usage. This will give you insight into the performance of the system as well as show how the hardware resources are being divided up across the various running services.

In this guide, we’ll go over a few methods to check and monitor the CPU utilization on a Linux system. Whether you are in charge of a server or just your personal desktop, the computer’s CPU usage is useful information that’s easy to acquire.

In this tutorial you will learn:
  • How to check CPU usage with top
  • Understanding the output from top and htop
  • Monitor CPU usage with systat package
  • How to configure CPU monitoring alters

The traditional way to schedule tasks on Linux, is to use the cron daemon, specifying time intervals and commands to be executed in crontabs.

Systemd, the relatively new init system now adopted by all the major Linux distributions, among the other things, provides the ability to schedule tasks using dedicated units, called timers. In this article we will learn how they are structured and some examples of their usage.

In this tutorial you will learn:
  • The basic structure of systemd timers;
  • How to create monotonic and realtime timers;
  • How to list and inspect active timers;
  • How to enable timers;
  • How to use transient timers;

The objective of this article is to provide the reader with an information on how to test microphone on Linux system.

In this tutorial you will learn:
  • How to test Microphone
  • How to record audio via microphone
  • How to play recorded audio

In this guide, you will learn how to setup an Nginx reverse proxy with step by step instructions. We will also explain how a reverse proxy server works and what its advantages are. In addition, we also go over various configuration options that Linux administrators commonly employ on their reverse proxy servers.

In this tutorial you will learn:
  • How does a reverse proxy work
  • What are the benefits of a reverse proxy
  • How to setup Nginx reverse proxy
  • How to pass headers
  • How to configure load balancing
  • How to test the Nginx configuration

The basic concept involved with the use of the osquery application is the "tabular abstraction" of many aspects of the operating system, such as processes, users, etc. The data is stored in tables which can be queried using SQL syntax, directly via the osqueryi shell, or via the osqueryd daemon.

In this tutorial we will see how to install the application, how to run basic queries, and how to use FIM (File Integrity Monitoring) as part of your Linux system administration job.

In this tutorial you will learn:
  • How to install osquery
  • How to list the available tables
  • How to perform queries from the osqueryi shell
  • How to use the osqueryd daemon to monitor file integrity

Apache web servers can generate a lot of logs. These logs contain information such as the HTTP requests that Apache has handled and responded to, and other activities that are specific to Apache. Analyzing the logs is an important part of administering Apache and ensuring that it runs as expected.

In this guide, we’ll go over the different logging options present in Apache and how to interpret this log data. You’ll learn how to analyze the logs that Apache produces and how to configure the logging settings to give you the most relevant data about what Apache is doing.

In this tutorial you will learn:
  • Configure and understand Apache webserver logging
  • What are Apache log levels
  • How to interpret Apache log formatting and its meaning
  • What are the most common Apache log configuration files
  • How to extend logging configuration to include forensic data

Apache Bench is a tool used to measure the performance of a web server. Despite having “Apache” in its name, it can actually be used to test any type of web server. In this tutorial, we’ll go over the steps to use Apache Bench and how to interpret its report about a web server’s performance.

Apache Bench works by sending varying amounts of HTTP requests to the web server and recording the response times. It can tell you how much congestion the server can handle before it gets overwhelmed and performance diminishes.

In this tutorial you will learn:
  • How to install Apache Bench
  • How to use Apache Bench
  • How to interpret Apache Bench Results

In this article we will be installing Arch Linux on ThinkPad X1 Carbon Gen 7 Laptop. This tutorial contains installation instructions, basic configuration as well as some post-install tuning of Arch Linux to get you started.

Most of the instructions are Arch Linux installation generic hence with a simple modifications this tutorial can be used for any UEFI system installations. However, some points are specific to ThinkPad X1 Carbon Gen 7 therefore basic Linux Administration skills are required in case you are installing Arch Linux PC/Laptop other then ThinkPad X1 Carbon Gen 7.

PLEASE NOTE
This guide will only get you started. If you have some additional tips and tricks on how to improve performance please use the comments below so we can incorporate them into this guide.
Thank you.

After completing this tutorial you will end up with:
  • Installed Arch Linux with GNOME desktop
  • Encrypted / directory using luks encryption
  • Configured Linux boot loader using systemd-boot
  • Created Logical Volumes and partitions to host your swap and / directory
  • Configured EFI parition for your /boot directory
  • Basic System configuration and fine-tuning
  • Ability to use wireless to connect to your WiFi from GNOME desktop
  • Functioning Bluetooth and Thunderbolt controller
  • Ability up upgrade a firmware on your ThinkPad X1 Carbon Gen 7

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