Ever had that sinking feeling when you see your server’s disk space slowly vanishing? You investigate, and the trail leads you to a directory named pg_wal, filled with countless files. If this sounds familiar, you’re in the right place. Before we dive in, let’s quickly talk about what these WAL files are. WAL stands for … The post Why Is PostgreSQL Not Deleting WAL Files? A Friendly Guide appeared first on howtouselinux.| howtouselinux
If you’ve ever worked with web servers, APIs, or command-line tools, you’ve almost certainly run into this frustrating message: curl: (7) Failed to connect to host... Connection refused. It’s a common roadblock that can stop you in your tracks. But what does it actually mean? And more importantly, how do you fix it? Think of … The post Fix Curl: Failed to connect to host Connection refused appeared first on howtouselinux.| howtouselinux
Getting started with a new database system can feel like exploring a new city. You need a map to find your way around and locate key landmarks. In PostgreSQL, one of the first “landmarks” you’ll want to find is your list of tables. If you have a background in MySQL, you might instinctively type SHOW … The post 2 Ways to Find Your Tables in PostgreSQL: A Complete Guide appeared first on howtouselinux.| howtouselinux
If you manage Linux systems, you’ve probably granted users special privileges at some point. Maybe you gave a teammate temporary access to install software. Or maybe you set up a new developer with administrative rights for testing. The problem? It’s easy to forget who still has those privileges. Over time, this can become a security … The post How to Find All Sudo Users in Linux (and Why It Matters) appeared first on howtouselinux.| howtouselinux
My journey with Linux networking began years ago.At first, I thought learning ifconfig or ip commands would be enough to handle any network configuration. But soon, I ran into a big challenge—different Linux distributions use different tools. Some default to NetworkManager, others rely on systemd-networkd, and on Ubuntu, I encountered Netplan. The more I worked … The post Never Get Confused About Your Linux Network Setup Again appeared first on howtouselinux.| howtouselinux
Diving into the Linux terminal to manage network connections can feel like a trip to a foreign land. I get it. But what if I told you there’s a powerful, friendly tool that can turn you into a network wizard? Meet nmcli. nmcli might sound cryptic, but it’s one of those tools that, once you … The post nmcli Command Deep-Dive: Your Secret Weapon for Managing Linux Networks appeared first on howtouselinux.| howtouselinux
For decades, wget has been one of the most familiar tools on Linux. If you needed to grab a file from the internet, chances are you typed wget followed by a URL. It was simple, reliable, and shipped out-of-the-box on nearly every Linux distribution. But things are changing. Starting with Ubuntu Server 25.10, wget will … The post Goodbye Wget — Ubuntu Will Drop It from the Default Install appeared first on howtouselinux.| howtouselinux
You’ve run into a classic system administrator puzzle. You need to stop your PostgreSQL database, so you type the standard command: sudo systemctl stop postgresql-14. The command finishes without any errors, but when you check the running processes, the database is still there, humming along. What’s going on? Is systemctl broken? The answer is no. … The post systemctl stop postgresql Not Working? Fix PostgreSQL Shutdown Issues Fast appeared first on howtouselinux.| howtouselinux
Network File System (NFS) is one of the most reliable ways to share files between Linux systems. But like any network-based service, it can sometimes fail when you need it most. One of the most common headaches administrators face is the dreaded NFS mount timeout error. If you’ve ever run into: mount.nfs: mount to NFS … The post How to Troubleshoot NFS Mount Timeout Issues in Linux appeared first on howtouselinux.| howtouselinux
The Gemini Command Line Interface (CLI) is a powerful tool that brings Google’s sophisticated Gemini models right to your fingertips within the command line. This step-by-step guide will walk you through the installation and initial setup of the Gemini CLI. Prerequisites: Setting the Stage for Installation Before we dive in, let’s quickly check if you …| howtouselinux
In the intricate world of computer networking, the Domain Name System (DNS) acts as the internet’s phonebook, translating human-readable domain names like “google.com” into machine-readable IP addresses. For Linux users, understanding how to check and verify the currently used DNS server is a fundamental skill for network troubleshooting and management. This article provides a complete …| howtouselinux
Linux, Cloud, DevOps, Python, SSL, SSH| howtouselinux
WWDC 2025 is full of headlines — new macOS, shiny UI updates, and AI features galore. But quietly, Apple also dropped something that caught the attention of developers working with Linux containers. And yes, it runs natively on Mac. If you’ve ever struggled with running containers on macOS, this might be the tool you’ve been …| howtouselinux
For years, most of the world has relied on the CVE system to track software vulnerabilities. It’s widely trusted, globally used, and managed by a well-known organization based in the United States. But in today’s world, digital resilience is becoming a shared responsibility. And depending entirely on a single system — especially one rooted in …| howtouselinux
Ubuntu Server is one of the most widely used Linux server distributions out there. Whether you’re spinning up cloud instances or managing a homelab, chances are you’ve interacted with it. But with Ubuntu 26.04 LTS on the horizon (scheduled for release in April 2026), the Ubuntu team is taking a closer look at some long-standing …| howtouselinux
Earlier this month, a subtle but significant change was quietly reverted in the Linux kernel’s development branch: a patch that had enabled DAMON, a memory access monitoring tool, by default. At first glance, it seemed like a reasonable enhancement. But then Linus Torvalds stepped in and shut it down with a firm “no.” So, what …| howtouselinux
Last weekend, something unexpected disrupted the calm routine of Linux kernel development. And it all started with a blunt message from Linus Torvalds: “Kees, what’s going on here?” Yes, that was from the Linux kernel mailing list. Get Your Free Linux training! Join our free Linux training and discover the power of open-source technology. Enhance …| howtouselinux
Linux is known for being solid, secure, and transparent. That reputation didn’t come easy — it’s been earned over decades. But as new features get added, sometimes even well-meaning innovations introduce unexpected side effects. That’s exactly what’s happening with io_uring, a performance-boosting feature in the Linux kernel that’s now being quietly misused. Researchers recently demonstrated …| howtouselinux
It’s been three years since Red Hat launched RHEL 9, and now the enterprise Linux giant is back with a major new release: Red Hat Enterprise Linux 10, powered by Linux kernel 6.12. If you’re running infrastructure at scale, especially in the cloud, this release is packed with forward-looking features worth your attention. But let’s …| howtouselinux
If you’ve been keeping an eye on modern replacements for aging system tools, you’ve probably heard of uutils, the Rust-based reimagining of GNU Coreutils. This project has been quietly gaining momentum—and now, with Ubuntu 25.10 planning to ship it by default, things are about to get a lot more interesting. Today marks a major milestone …| howtouselinux
Time might seem like a small detail in your operating system — something you rarely think about unless your clock is wrong. But in reality, accurate timekeeping is essential to everything from file timestamps and system logs to encryption and security protocols. And now, with Ubuntu 25.10, the way your system keeps time is getting …| howtouselinux
Redis, the company behind the blazing-fast key-value database that powers everything from caching to AI workloads, is stepping back into the open source world — sort of. Starting with Redis 8, the company is adding the GNU Affero General Public License (AGPL) as a new licensing option. This comes after a year of controversy over …| howtouselinux
Welcome to the ultimate Linux training guide! If you’re keen on expanding your technical skills, refining your system administration expertise, or boosting your efficiency in Linux tasks, this guide is designed for you. It will walk you through the essential skills needed to master the Linux command line. Simply enter your email address, and we’ll …| howtouselinux
