sysadmin – Page 9 – ITFROMZERO

Linux SWAP Configuration Guide: A “Spare Tire” for Low-RAM Servers

By admin April 1, 2026

Don't let your server crash due to RAM exhaustion. A detailed guide on creating a Linux Swap File, optimizing swappiness, and practical tips for maintaining system stability under heavy load.

Centos

Installing LEMP Stack on Rocky Linux 9: Lessons from a “Stormy” Server Migration

By admin March 31, 2026

Learn how to install the LEMP Stack on Rocky Linux 9 based on real-world migration experience. This guide covers optimizing Nginx, MariaDB, and PHP 8.1 for peak performance.

Linux

Mastering awk and sed: Log and Config File Processing Secrets for Sysadmins

By admin March 30, 2026

Stop editing GB-sized log files by hand. Learn how to use awk and sed to automate your Linux workflow with real-world expert examples.

Linux

Understanding and Using Linux Capabilities: Fine-Grained Permissions Without Root for Applications

By admin March 25, 2026

Don't grant full root privileges to your application! This article provides a detailed guide on Linux Capabilities, a flexible permission mechanism that allows applications to perform privileged tasks without needing full root access. Includes a quick guide, in-depth explanations, and practical experiences for DevOps professionals.

Network

Setting Up a PXE Boot Server on Linux: Automated OS Installation Over the Network for Multiple Servers

By admin March 23, 2026

A hands-on guide to deploying a PXE Boot Server on Linux with dnsmasq, TFTP, and NFS for automated OS installation across multiple servers over the network. Covers detailed configuration, boot menus, BIOS/UEFI differences, and a quick health check script for the full stack.

Python

Python and Linux: Useful Sysadmin Scripts for Task Automation

By admin March 22, 2026

How to effectively handle repetitive tasks on Linux? Python is the answer. This article guides you on writing useful Python scripts to automate system administration work, helping you be more efficient and reduce risks.

Centos

Saving a server at 2 AM: A detailed guide to DNF Package Manager on RHEL/Rocky Linux

By admin March 19, 2026

At 2 AM, the server reported an error, and DNF was my savior. This article shares practical experience using DNF on RHEL/Rocky Linux, from basic commands to advanced tips, helping you confidently troubleshoot issues.

Linux

Optimize Linux server performance for production: A detailed guide for beginners

By admin March 17, 2026

This article provides a detailed guide on how to optimize Linux server performance for a production environment. From resource monitoring to fine-tuning CPU, RAM, Disk I/O, and Network, it's aimed at beginners.

Network

Free Online Network Tools for SysAdmins: Subnet Calculator, DNS Lookup, IP Converter

By admin March 15, 2026

Free online network tools I keep bookmarked for emergency troubleshooting: Subnet Calculator for CIDR/overlap, DNS Lookup for propagation checks, IP Converter for cross-platform configs — all run directly in the browser, no installation needed.

Linux

How to Configure sudo and the sudoers File on Linux: Safe Permission Management for Each User

By admin March 15, 2026

A comparison of 3 approaches to granting sudo access on Linux: adding users to the wheel/sudo group, editing /etc/sudoers directly, or using /etc/sudoers.d/. Covers the pros and cons of each approach along with practical configuration guides using visudo, Command Aliases, and NOPASSWD for team-based production environments.