sysadmin Archives - Page 2 of 11

Linux Ftrace: Diagnosing Kernel Latency Without the Strace Overhead

May 28, 2026

Master Ftrace, the Linux kernel's built-in tracer, to solve production latency. Learn function graphing, PID filtering, and how to interpret microsecond-level bottlenecks with minimal overhead.

Security

Linux Privilege Escalation: From Initial Foothold to Root Access

May 26, 2026

Is your Linux server one misconfig away from a total breach? Learn how attackers exploit SUID bits and sudoers files, and how to use tools like LinPEAS and Auditd to stop them.

Linux

Mastering udev Rules: Fix Shifting USB Names and Automate Linux Hardware

May 26, 2026

Tired of your Linux device names changing after every reboot? Learn how to write udev rules to create persistent symlinks, automate hardware scripts, and manage USB permissions like a pro.

Linux

Locking Down SFTP: A Field Guide to Chroot Jails on Linux

May 24, 2026

Isolate SFTP users and prevent lateral movement. This production-ready guide walks you through OpenSSH Chroot Jails, strict permission mapping, and monitoring strategies.

Networking

Speed and Stability: Configuring MultiPath TCP (MPTCP) on Linux

May 24, 2026

Combine multiple network links for double the speed and 100% uptime. This guide shows you how to configure MultiPath TCP (MPTCP) on modern Linux systems using native kernel tools.

Linux

Real-Time File System Monitoring with inotifywait and incron on Linux: Auto-Trigger Scripts on File Events

May 23, 2026

Learn how to use inotifywait and incron to monitor Linux filesystem changes in real time and automatically trigger shell scripts when files are created, modified, or deleted. Includes practical examples for upload processing, config reloading, and debouncing rapid events.

Linux

Mastering Linux initramfs: Custom Drivers and Boot Scripts

May 23, 2026

Don't let boot errors stop you. Learn how to inject drivers, kernel modules, and custom scripts into the Linux initramfs for both Debian and RHEL systems.

Networking

Stop Using ifconfig: A Guide to Professional Networking with nmcli

May 21, 2026

Ditch deprecated tools like ifconfig. Learn how to use nmcli for professional Linux networking, including static IP setup, DNS management, and SSH safety tips.

Networking

Bypassing Strict Firewalls with Chisel: A 6-Month Production Review

May 19, 2026

Is your firewall blocking everything but port 443? Here is a 6-month field report on using Chisel to tunnel TCP/UDP traffic over WebSockets with zero downtime.

Security

Defending Active Directory: Real-World Tactics Against PtH, Kerberoasting, and Golden Ticket Attacks

May 19, 2026

Secure your Active Directory against modern credential theft. A hands-on guide to using BloodHound for auditing, GPO hardening for PtH, and Sysmon for Kerberoasting detection.