Linux

Meeting i3wm: A Choice for Productivity The i3 window manager (i3wm) is a tiling window manager focused on efficiency and productivity. It was first developed in 2009 by German developer Michael Stapelberg to address the limitations of the wmii window manager. The name “i3” stands for “improved tiling wm.” Written in C with roughly 10,000 lines of concise code, i3 is lightweight while still offering powerful functionality. It has become popular among developers, system administrators, and power users who prefer keyboard-driven workflows with minimal mouse use. It is especially common among users of distributions such as Arch Linux, Gentoo, and NixOS. ...

ZRAM Concept and Principles ZRAM (formerly known as compcache) is a memory compression technology provided by the Linux kernel that creates a virtual block device by compressing a portion of RAM. This technology was first developed by Nitin Gupta in 2009 and officially integrated into the Linux kernel from version 3.14. It has been widely used ever since. The core idea of ZRAM is to utilize compressed RAM as swap space instead of disk-based swap, effectively reducing memory usage without the overhead of disk I/O operations. This approach significantly improves system performance, especially in memory-constrained environments. ...

The Need for Changing MAC Address A MAC address (Media Access Control address) is a unique hardware address that identifies a network device. It is assigned to the Network Interface Card (NIC) during manufacturing, but it can still be changed through software when needed. This can be useful for privacy, security, bypassing network access controls, or setting up test environments. It is especially helpful on public Wi-Fi or when you want to reduce network tracking. Most Linux distributions, including Ubuntu, let you change MAC addresses through software. This post explains how to do it safely and effectively in Ubuntu. ...

Wine Concept and How It Works Wine (Wine Is Not an Emulator) is a compatibility layer that allows Windows programs to run on UNIX-compatible operating systems such as Linux, macOS, and BSD. On Ubuntu 24.04 LTS, it provides a way to run many Windows applications without installing Windows itself. It is an open-source project started by Bob Amstadt and Eric Youngdale in 1993 and now has more than 30 years of development history. The name is a recursive acronym chosen to emphasize that Wine is not a traditional emulator. ...

Docker is a platform for developing, deploying, and running container-based applications. It uses Linux kernel namespaces and cgroups to run applications in isolated environments. This guide explains the step-by-step process of installing Docker and running your first container on Ubuntu Linux. Docker Installation Requirements Docker Installation Requirements Docker Engine runs on 64-bit Linux systems and requires kernel version 3.10 or higher. For Ubuntu, versions 20.04 LTS, 22.04 LTS, and 24.04 LTS are officially supported. ...

SSH (Secure Shell) is an encrypted network protocol for securely accessing another computer over a network, running commands, and transferring files. Today, OpenSSH is the de facto standard implementation and a core tool for server management. Installing and configuring an SSH server on Ubuntu lets you manage a system remotely, whether it is on a local network or reachable over the internet. This guide walks through the full process, from installing OpenSSH Server to applying basic security settings. ...

A static IP address is an IP address manually specified by a network administrator instead of being dynamically assigned from a DHCP server. It is essential in environments where the IP address must not change, such as server operation, remote access, and network service hosting. Ubuntu 24.04 LTS uses Netplan as the default network configuration tool and also supports nmcli and nmtui interfaces through NetworkManager, allowing users to configure networks in their preferred way. ...

Kubernetes is a container orchestration platform that Google open-sourced in 2014. It is now managed by CNCF (Cloud Native Computing Foundation) and has become the de facto standard for automating the deployment, scaling, and management of containerized applications. Production environments typically use multi-node clusters for high availability, but a single-node cluster is enough for development, testing, and learning. This guide walks through the full process of building a single-node Kubernetes cluster with kubeadm on Ubuntu 24.04 LTS. ...

Vim, short for Vi IMproved, was created by Bram Moolenaar in 1991 as an expanded version of the vi editor Bill Joy wrote for BSD Unix in 1976. It keeps vi’s core philosophy of modal editing while adding modern features such as syntax highlighting, multiple undo, plugin support, and split windows. Because it comes pre-installed on nearly all Unix-like systems, Vim remains especially useful for server management and editing over SSH. It also benefits from decades of community knowledge and a robust plugin ecosystem. ...

Linux container technology has steadily evolved since mount namespaces first appeared in kernel 2.4.19 in 2002. Namespaces provide process isolation, while Cgroups (Control Groups) provide resource control. Together, they form a core foundation of modern cloud infrastructure. Container runtimes such as Docker, Kubernetes, and Podman rely on these two kernel features to provide isolation that is much lighter and faster than virtual machines, and understanding them is the first step toward a deeper grasp of container technology. ...