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Protecting SSH Keys with TPM 2.0 on Linux: Private Keys That Can’t Be Stolen Even with Root Access

By admin September 8, 2026

A practical guide to protecting SSH private keys with TPM 2.0 on Linux: keys are stored inside the hardware chip and cannot be stolen even if an attacker has root access. Covers installing tpm2-pkcs11, generating keys inside the TPM, and configuring SSH with PKCS11Provider so no key file ever touches disk.

Centos

Installing Webmin on CentOS Stream 9: Effortless Linux Server Administration via Web UI

By admin September 5, 2026

A guide to installing and securing Webmin on CentOS Stream 9. Manage Linux servers professionally via a Web interface and save up to 40% on configuration time.

Security

Systemd Hardening: Securing Services with ProtectSystem, ProtectHome, and PrivateTmp

By admin September 3, 2026

systemd ships with powerful built-in hardening features — ProtectSystem, ProtectHome, and PrivateTmp — that isolate services at the kernel level with no extra software required. This guide covers practical configuration steps and how to verify effectiveness with systemd-analyze security.

Security

Building an Incident Response Process for Linux Servers: Investigation, Containment, and Recovery After an Attack

By admin June 13, 2026

A practical guide to building a Linux Server Incident Response process using the PICERL model: from confirming an incident and emergency network isolation, to collecting evidence, eradication, and safely restoring the system. Includes real commands drawn from hands-on production incident experience.

Ubuntu

Logwatch: Condense Thousands of Ubuntu Log Lines into a Daily Email Report

By admin May 27, 2026

Learn how to install Logwatch on Ubuntu to automate system log monitoring. This guide provides detailed configuration to receive daily summary reports via email, saving server administration time.

Security

Installing and Configuring CrowdSec on Ubuntu: A New Generation Community Server Protection Solution

By admin March 19, 2026

Protecting servers from cyberattacks is a top priority. CrowdSec offers a novel, community-based approach to detect and prevent threats. This article guides you through installing and configuring CrowdSec on Ubuntu.

Security

Linux Server Security Audit with Lynis: From Installation to a Hardening Index of 80+

By admin March 8, 2026

Lynis runs directly inside your server and checks over 200 configuration points that remote scanners simply can't see. This guide walks through installation, interpreting results, and fixing real-world warnings — from SSH to kernel hardening — to push your hardening index from 55 up to 80+.

Ubuntu

Configuring Fail2ban to Protect Your Ubuntu Server from Brute-Force Attacks

By admin March 6, 2026

Fail2ban automatically blocks brute-force IPs targeting SSH, Nginx, and WordPress by reading logs and adding iptables rules. This guide covers installation, practical jail configuration, and common troubleshooting scenarios on Ubuntu 22.04.

Centos

Managing Services with firewalld on CentOS/RHEL: A Practical Guide

By admin March 6, 2026

firewalld is the default firewall management tool on CentOS/RHEL, offering flexible zone-based policies that are easier to manage than plain iptables. This article covers practical usage from quick start to rich rules, port forwarding, and tips drawn from real production server management.

Centos

Configuring SELinux on Rocky Linux: Don’t Disable It Before You Understand What It Does

By admin March 6, 2026

From firsthand experience migrating 5 servers off CentOS 8 EOL to Rocky Linux, this guide covers how to configure SELinux properly — from Permissive for debugging to Enforcing on production — with practical audit2allow, sealert, and semanage examples.