Arrays in C Programming with Examples
Arrays in C allow you to store multiple items of the same data type, such as a list of integers. Arrays form the basis for many data structures and allow you to build advanced...
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How to Add, Remove and Modify Users in Linux
As a Linux administrator, it is essential to know how to add users, modify users and delete users in a Linux system. It is a good practice to have different accounts for different users...
Building Recursive Descent Parsers: The Definitive Guide
Parsers are programs that help process text. Compilers and interpreters use parsers to analyze programs before processing them further, and parsers for formats like JSON and YAML process text into the programming language’s native...
How to Set up SSH Keys on a Linux/Unix Server
SSH (Secure SHell) is a network protocol that allows you to securely execute commands on and transfer files to a remote server. Typically, most servers running SSH are configured to use password-based authentication; however,...
cURL Command Tutorial with Examples
cURL is a command line tool and a library which can be used to receive and send data between a client and a server or any two machines connected over the internet. It supports...
OpenVZ vs KVM vs Xen – Virtualization Technologies Explained
There are many different virtualization technologies available in the market, such as OpenVZ, KVM and Xen. You may have come across these terms when trying to while trying to buy a Virtual Private Server...
How to Download Files and Web Pages with Wget
The wget command allows you to download files over the HTTP, HTTPS and FTP protocols. It is a powerful tool that allows you to download files in the background, crawl websites, and resume interrupted...
How to Kill a Process in Linux
In an operating system, there are many programs, which may be either run by an user or by the OS itself (such as system services). Such programs which are running on the system are...
A Guide to the Linux “Find” Command
The find command allows users to search for files and take actions on them. It is part of the “findutils” package and comes bundled with all distributions. It is highly flexible, allowing you to...
An Introduction to Linux File Permissions
Linux is a multi-user operating system, and it ensures the security of files with the concepts of “ownership” and “permissions”. You can use these concepts to control who can access and modify files. In...
How to Install and Use Glances to Monitor Linux Systems
Monitoring a system is essential for keeping things running smoothly. Glances is a Python-based tool which provides information on various aspects of the system, such as running processes, I/O, memory and so on. It...
A Guide to Monitoring Servers with Nagios
Monitoring is an essential part of managing infrastructure. It helps you to ensure that your business keeps running smoothly, by alerting you to problems as they occur. Nagios is a very popular open-source application...
RAID levels 0, 1, 4, 5, 6, 10 explained
As businesses grow, demand arises for more reliable infrastructure that can handle critical systems. An important component in stable and scalable infrastructure is proper memory management. In this article, we will look at RAID...
How to Install and Use Prometheus for Monitoring
Monitoring is an important part of managing applications deployed on servers. They help you ensure applications run smoothly, as well as troubleshoot any problems that may arise. In this article, we will look...
How to Monitor Network Traffic on Linux Using vnStat
Developers and sysadmins may need to monitor various network parameters, such as bandwidth consumption and the traffic flowing in/out. There are many tools available for this purpose, one of them being vnStat. It is...
How to Set up Basic HTTP Authentication on nginx
Files placed on a web server are publicly accessible by default. If you want to protect files from unauthorized access, you can make use of HTTP basic authentication. It is a simple authentication method,...
Building Cross-Distribution Linux Applications with Flatpak
Fragmentation has been a problem for quite some time in the Linux ecosystem. A variety of distributions exist today, with their own package managers and their own notions of what a “base system” consists...
Getting Started with Docker – Part 2
Docker has changed the way developers run, organize and deploy their code and infrastructure. In the docker series articles, we will be understanding how Docker works, installation and running code, deployment, container management and more....
A Guide to the Linux “Top” Command
The top command allows users to monitor processes and system resource usage on Linux. It is one of the most useful tools in a sysadmin’s toolbox, and it comes pre-installed on every distribution. Unlike...
How to Configure nginx as a Load Balancer
For very small websites, a single server running a web application is usually enough. However, this doesn’t work well for larger websites. In such cases, we make use of “load balancing”, a technique that...