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Linux Systems

Ubuntu, CentOS, and Linux system administration tutorials

32 tutorials

A laptop on a rack shelf showing a blurred kernel version line, a USB stick beside the keyboard, cool room light, no logos.

Ubuntu 26.10 Says Linux 7.3. The Package Is rc6.

Phoronix and OMG Ubuntu say 26.10 ships Linux 7.3. Linuxiac and Heise say the kernel package is 7.3-rc6. Check uname before you trust the headline.

October 19, 2026 ⏱️ 20 minutes

UbuntuLinux 7.3uutils

Three closed manila folders of different thicknesses on a steel rack shelf, with a coiled unplugged ethernet cable beside them.

🐧 linux Intermediate

USN-8920-1 Is a 5.4 Kernel. The OEM Fix Is Not.

USN-8920-1 is a 5.4 kernel for 20.04 and 18.04. The 6.17 OEM fix is USN-8911-1. The three October notices do not share a CVE.

October 16, 2026 ⏱️ 20 minutes

UbuntuUSN-8920-1Linux kernel

An open laptop on a bench beside a small TPM chip on an anti-static mat, cool shop light, no vendor logos and no readable text on the screen.

🐧 linux Intermediate

Arch Linux 2026.10.01: Update, Then Re-enroll

Arch Linux 2026.10.01 ships kernel 7.2.7 and systemd 262 for new installs. Existing LUKS hosts on mkinitcpio 42 still have to re-enroll TPM2.

October 3, 2026 ⏱️ 40 minutes

Arch LinuxmkinitcpioTPM2

Two terminal windows on a desk, one showing a kernel version string too blurred to read, a USB stick beside the keyboard, cool rack lighting, no logos.

🐧 linux Intermediate

Ubuntu 26.10 Snapshot 4: Linux 7.2, and cp Is Finally Rust

Snapshot 4 ships Linux 7.2. Draft notes say uutils now covers cp, mv, and rm. Test it in a VM. Leave 26.04 LTS on GNU until backup scripts run.

September 19, 2026 ⏱️ 30 minutes

Ubuntuuutilscoreutils

Rack server with a laptop showing a terminal kernel version string, cool aisle lighting, no logos.

🐧 linux Intermediate

Ubuntu 24.04.5 Ships Linux 7.0. rc2 of 7.3 Is Already Loud

Canonical's fifth Noble point release puts Linux 7.0 on the install media. Torvalds called 7.3-rc2 unusually fat and joked about AI. Patch the LTS image you actually run. Do not confuse it with the mainline circus.

September 13, 2026 ⏱️ 25 minutes

UbuntuLinux 7.0kernel

A Linux terminal on a server KVM showing an openvpn version string, rack lights in the background.

🐧 linux Intermediate

OpenVPN 2.7.7 Fixes Seven CVEs. Patch Linux First.

OpenVPN 2.7.7 patches CVE-2026-84732 on every platform, hardens Linux Netlink, and stops --stale-routes-check from deleting static routes. Here is how to upgrade and verify.

September 9, 2026 ⏱️ 25 minutes

OpenVPNLinuxCVE

Linux terminal showing uname -r and sysctl IPv6 settings on a server console

🐧 linux Intermediate

CVE-2026-53362: How to Patch the IPv6 Kernel Flaw

CISA added CVE-2026-53362 to KEV after real-world exploits. Check your kernel, patch or livepatch, and mitigate IPv6 exposure on Linux servers.

September 3, 2026 ⏱️ 20 minutes

LinuxkernelCVE-2026-53362

Terminal window displaying htop process viewer with color-coded CPU and memory bars

🐧 linux Intermediate

Linux Process Management: A Complete Guide to htop, systemctl, and Beyond

Master Linux process management from basic signals to advanced cgroup controls. This guide covers htop, ps, kill, nice, and systemd service management for production servers.

August 27, 2026 ⏱️ 25 minutes

Linuxhtopprocess management

Terminal screen showing Linux user management commands with green text on dark background

🐧 linux Intermediate

Linux User and Group Management: A Complete Server Administration Guide

Master Linux user and group management with this hands-on guide covering user creation, permissions, sudo configuration, PAM authentication, and security best practices for production servers.

August 21, 2026 ⏱️ 25 minutes

Linuxuser managementpermissions

Rack-mounted server beside stacked log printouts and a crowded disk shelf

🐧 linux Intermediate

Linux Log Rotation and Disk Space Management: A Practical Guide

Your server ran out of disk space at 3am. The culprit? Logs. Here's how to configure logrotate, manage systemd journal size, and prevent disk exhaustion from killing your production services.

August 15, 2026 ⏱️ 20 minutes

logrotatejournalddisk space

Terminal screen showing systemd service status output with green active indicators and structured log entries

🐧 linux Intermediate

Systemd Service Management in 2026: Best Practices for Production Servers

A complete guide to creating, managing, and hardening systemd services for production Linux environments. Covers unit file structure, logging, security sandboxing, and resource limits.

August 7, 2026 ⏱️ 25 minutes

systemdLinuxservice management

Terminal screen showing memory monitoring commands with green text on dark background

🐧 linux Intermediate

Your Server's OOM Killer Is Not the Problem — Your Memory Configuration Is

A systematic guide to understanding Linux memory pressure, monitoring PSI, tuning swap and overcommit settings, and preventing the OOM killer from terminating your processes.

August 3, 2026 ⏱️ 25 minutes

Linuxmemory-managementOOM-killer

Terminal window showing cgroups v2 migration commands on a dark background

🐧 linux Intermediate

Migrating from cgroups v1 to v2: A Step-by-Step Guide for Linux Servers

Your distro is switching to cgroups v2 whether you like it or not. Here is how to migrate without breaking your containers, Kubernetes clusters, or monitoring tools.

August 2, 2026 ⏱️ 30 minutes

cgroupscgroups-v2linux-kernel

Terminal window showing journalctl command output with green text on dark background, systemd journal entries scrolling with timestamps

🐧 linux Intermediate

journalctl Mastery: Stop Grepping Through /var/log Like It's 2005

systemd's journalctl is the most powerful log tool on modern Linux servers, and most admins use maybe 10% of it. Here's the other 90% — from time-based queries to real-time monitoring and disk management.

Linux Systems

Ubuntu 26.10 Says Linux 7.3. The Package Is rc6.

USN-8920-1 Is a 5.4 Kernel. The OEM Fix Is Not.

Arch Linux 2026.10.01: Update, Then Re-enroll

Ubuntu 26.10 Snapshot 4: Linux 7.2, and cp Is Finally Rust

Ubuntu 24.04.5 Ships Linux 7.0. rc2 of 7.3 Is Already Loud

OpenVPN 2.7.7 Fixes Seven CVEs. Patch Linux First.

CVE-2026-53362: How to Patch the IPv6 Kernel Flaw

Linux Process Management: A Complete Guide to htop, systemctl, and Beyond

Linux User and Group Management: A Complete Server Administration Guide

Linux Log Rotation and Disk Space Management: A Practical Guide

Systemd Service Management in 2026: Best Practices for Production Servers

Your Server's OOM Killer Is Not the Problem — Your Memory Configuration Is

Migrating from cgroups v1 to v2: A Step-by-Step Guide for Linux Servers

journalctl Mastery: Stop Grepping Through /var/log Like It's 2005

Bad Epoll: New Linux Kernel Flaw Lets Unprivileged Users Grab Root — and Android Is Affected Too

Linux Kernel Drops strncpy After Six Years: What Server Admins Need to Know

How to Check if Your Linux Server Is Affected by the PAM Backdoor Discovered in 2026

Linux Kernel 7.1 Is Here: What Server Administrators Need to Know

systemd Service Hardening: Sandboxing with ProtectSystem, PrivateTmp, and CapabilityBoundingSet

Linux I/O Scheduling: Choosing the Right Scheduler for Database and Web Servers

Btrfs Snapshots and Send/Receive: Incremental Backup Strategy for Linux Servers

Linux sysctl Tuning: Kernel Parameters Every Server Admin Should Know

Linux Namespace Isolation: Understanding Container Foundations at the Kernel Level

Linux LVM Volume Management: Resize, Snapshots, and Migration Without Downtime

From Cron to Systemd Timers: Modern Linux Job Scheduling

Mastering journalctl: Advanced Linux Log Management for Sysadmins

Linux Performance Troubleshooting: Complete Guide for Server Administrators

Ubuntu 26.04 LTS Preview: What's New and Should You Upgrade?

Mastering iptables: Linux Firewall Fundamentals

Log Rotation with logrotate: Linux System Management

Systemd Service Management: Complete Guide for Linux Administrators

Ubuntu 22.04 Server Setup: Complete Configuration Guide