If you run a Linux server with Nginx, SSH, or WordPress, you probably already know Fail2Ban. It is a solid tool, but it works locally — it blocks only the IP addresses that attacked your server. CrowdSec works in a completely different way. It is a protection system based on shared IP reputation. If thousands […]
This guide shows a complete Fail2Ban installation and configuration for Nginx, designed to: block real scanners and exploit attempts (e.g. requests to /.env, /.git, /phpmyadmin, etc.), avoid blocking administrators by accident (common issue when banning only by HTTP errors), ban IP addresses after repeated suspicious activity, use a short ban time (5 minutes) to reduce […]
Upgrading Debian from version 12 (bookworm) to 13 (trixie) is an operation that should be performed in a repeatable and predictable way, especially on servers and containers (for example Proxmox LXC or virtual machines). Below you will find a simple guide and ready-to-use commands to download and run the upgrade script. Before running the upgrade: […]
If you’re trying to update the firmware of a Dell WD19/WD19S docking station on Proxmox (or Debian) using fwupdmgr, you may hit the classic Operation timed out error during the Erasing… stage. In practice, the update fails due to USB power management (autosuspend). Below you’ll find a simple, effective fix and a ready-to-run script you […]
Want your Tmux window titles to automatically show the hostname you connect to via SSH — and restore the local name after you disconnect? This guide will walk you through setting that up step by step. 1. Tmux configuration – ~/.tmux.conf In your Tmux configuration file, set the default shell command to a custom Bash […]
Automation of Disk Space Management in a Linux Environment In today’s digital world, where data is being accumulated in ever-increasing amounts, managing disk space has become a key aspect of maintaining operational efficiency in systems. In this article, I will present a script that automates the process of managing space on a remote disk mounted […]
Expanding disk space in Linux virtual machines is a key aspect of server system management. In this article, we show how to effectively increase disk space using LVM and fdisk tools, based on real system data. Preliminary Preparations Before making changes to partitions and volumes, it is important to check the current state of the […]
In today’s world, where data is becoming increasingly valuable, proper backup management is crucial for the security of information systems. In this article, I present an effective way to automate the backup of key configuration files in Proxmox-based systems using a simple bash script and Crontab configuration. Bash Script for Backup of the /etc Directory […]
Upgrading Apache Cassandra to a newer version is a significant task that database administrators undertake to ensure their systems benefit from new features, enhanced security measures, and improved performance. This guide provides a detailed walkthrough for upgrading Apache Cassandra from version 3.1.15 and higher to the latest 4.1.x version, specifically on Ubuntu 20.04.5 LTS, with […]
There are situations when we need to increase the encryption level on the old system – according to the PCI audit requirements. However, the old system is no longer supported, so updating the encryption level is not possible. This is not a recommended solution, because we should try to transfer the application to a new […]
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