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Linux Systems

Ubuntu, CentOS, and Linux system administration tutorials

21 tutorials

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.

July 26, 2026 ⏱️ 20 minutes

Linuxsystemdjournalctl

Terminal-style illustration showing a Linux kernel vulnerability warning with epoll subsystem highlighted, dark background with green terminal text elements

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

A race condition in the Linux kernel's epoll subsystem allows local privilege escalation to root. Servers, desktops, and Android devices are all vulnerable. Here's what to patch and how to check if you're exposed.

Linux kernelprivilege escalationCVE

Linux kernel code being refactored showing modern C string functions replacing legacy strncpy calls

🐧 linux Intermediate

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

Linux 7.2 finally removes the decades-old strncpy API after 360+ patches. Here's why this matters for your servers and what you should check before upgrading.

Linux kernelstrncpysecurity

A Linux terminal screen showing authentication logs with a red warning overlay, dark server room background with green terminal text

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

A decade-long supply chain compromise in Linux PAM modules has been uncovered. Here's how to audit your servers, detect the backdoor, and secure your authentication stack.

LinuxSecurityPAM

🐧 linux Intermediate

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

A practical breakdown of Linux Kernel 7.1's most impactful changes for server environments, covering the new NTFS driver, Landlock security improvements, power management updates, and upgrade strategies.

June 15, 2026 ⏱️ 12 minutes

LinuxKernelSystem Administration

Terminal-style illustration for systemd Service Hardening: Sandboxing with ProtectSystem, PrivateTmp, and CapabilityBoundingSet

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

A hands-on guide covering configuration, troubleshooting, and best practices for systemd service hardening: sandboxing with protectsystem, privatetmp, and capabilityboundingset.

LinuxSystemdHardening

Terminal-style illustration for Linux I/O Scheduling: Choosing the Right Scheduler for Database and Web Servers

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

A hands-on guide covering configuration, troubleshooting, and best practices for linux i/o scheduling - choosing the right scheduler for database and web servers.

LinuxI/OPerformance

Terminal-style illustration for Btrfs Snapshots and Send/Receive: Incremental Backup Strategy for Linux Servers

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

A hands-on guide covering configuration, troubleshooting, and best practices for btrfs snapshots and send/receive - incremental backup strategy for linux servers.

LinuxBtrfsBackup

Terminal-style illustration for Linux sysctl Tuning: Kernel Parameters Every Server Admin Should Know

Linux sysctl Tuning: Kernel Parameters Every Server Admin Should Know

A hands-on guide covering configuration, troubleshooting, and best practices for linux sysctl tuning - kernel parameters every server admin should know.

LinuxsysctlKernel

Terminal-style illustration for Linux Namespace Isolation: Understanding Container Foundations at the Kernel Level

Linux Namespace Isolation: Understanding Container Foundations at the Kernel Level

A hands-on guide covering configuration, troubleshooting, and best practices for linux namespace isolation - understanding container foundations at the kernel level.

LinuxNamespacesContainers

Terminal-style illustration for Linux LVM Volume Management: Resize, Snapshots, and Migration Without Downtime

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

A hands-on guide covering configuration, troubleshooting, and best practices for linux lvm volume management - resize, snapshots, and migration without downtime.

LinuxLVMStorage

Terminal-style illustration for From Cron to Systemd Timers: Modern Linux Job Scheduling

From Cron to Systemd Timers: Modern Linux Job Scheduling

A hands-on guide covering configuration, troubleshooting, and best practices for from cron to systemd timers - modern linux job scheduling.

LinuxSystemdCron

Terminal-style illustration for Mastering journalctl: Advanced Linux Log Management for Sysadmins

Mastering journalctl: Advanced Linux Log Management for Sysadmins

A hands-on guide covering configuration, troubleshooting, and best practices for mastering journalctl - advanced linux log management for sysadmins.

LinuxjournalctlSystemd

Linux server performance monitoring dashboard showing CPU, memory, disk I/O, and network metrics

Linux Performance Troubleshooting: Complete Guide for Server Administrators

Master Linux performance troubleshooting with this comprehensive guide. Learn to diagnose and fix CPU, memory, disk I/O, and network bottlenecks using modern tools.

LinuxPerformanceTroubleshooting

Ubuntu 26.04 LTS desktop preview showing new interface and system settings

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

Ubuntu 26.04 LTS 'Noble Numbat' preview covering new features, kernel updates, performance improvements, and upgrade recommendations for server administrators.

UbuntuLinuxServer

Linux iptables firewall rules visualization with packets

Mastering iptables: Linux Firewall Fundamentals

Learn to configure iptables for Linux server security. This comprehensive guide covers chain management, rule configuration, logging, and production deployment best practices.

February 8, 2026

iptablesfirewallLinux

Linux log files with rotation cycle visualization

Log Rotation with logrotate: Linux System Management

Configure log rotation to manage disk space and maintain log files. This guide covers logrotate configuration, compression, retention policies, and automation.

February 8, 2026

logrotatelogsLinux

Systemd service management terminal interface

Systemd Service Management: Complete Guide for Linux Administrators

Master systemd for managing services, daemons, and system resources on Linux. Learn unit file creation, service lifecycle management, and troubleshooting techniques.

February 8, 2026

systemdLinuxservice management

Ubuntu 22.04 LTS server terminal configuration screen

Ubuntu 22.04 Server Setup: Complete Configuration Guide

A comprehensive guide to configuring a production-ready Ubuntu 22.04 server. From initial installation to security hardening and service configuration.

February 8, 2026

Ubuntu 22.04server setupLinux