linux server – Page 5 – ITFROMZERO

Securing SSH with Hardware Security Keys (FIDO2/Yubikey): When Private Keys Are No Longer a ‘Fatal Weakness’

By admin April 20, 2026

Hardening server security with Hardware Security Keys (Yubikey/FIDO2). A detailed guide on setup, using Resident Keys, and configuring servers to prevent private key leaks.

Centos

The Secret to Server ‘Immortality’: Configuring HA Clusters with Pacemaker and Corosync

By admin April 17, 2026

Learn how to build a High Availability (HA) Cluster with Pacemaker and Corosync on CentOS/Rocky Linux. A detailed guide from installation and Virtual IP configuration to handling Split-brain errors.

Docker

Migrating Docker Containers to a New Server: A ‘Manual’ but Rock-Solid Method

By admin April 17, 2026

Can't use a Docker Registry for migration? Try the docker save, load, and rsync combo. A detailed guide on safely moving containers and data to a new server.

Ubuntu

Installing ZFS on Ubuntu: The ‘Lifesaver’ for Peace of Mind and Data Security

By admin April 15, 2026

ZFS is a top-tier storage solution offering absolute data protection through Snapshots and RAID-Z. Learn how to install and optimize ZFS on Ubuntu for professional-grade storage.

Virtualization

SPICE Protocol: The Ultimate Secret for Remote KVM Access as Smooth as a Physical Machine

By admin April 14, 2026

Configure SPICE Protocol for KVM to reduce screen latency, support two-way audio, and enable smooth USB Passthrough. Detailed guide for Proxmox and Ubuntu Server.

Fedora

Mastering firewalld on Fedora: From Zone Management to Rich Rules Pro Tips

By admin March 30, 2026

Enhance your Fedora server security with this in-depth firewalld guide. Learn how to use Zones, Services, and Rich Rules to block IPs and limit connection rates effectively.

Ubuntu

Installing PostgreSQL on Ubuntu 22.04: From Zero to Production Deployment

By admin March 29, 2026

Learn how to professionally install and configure PostgreSQL on Ubuntu 22.04. A guide to creating users, securing remote connections, and managing disk space effectively.

Ubuntu

Mastering Netplan on Ubuntu: From Static IP to Professional Bridge and Bond Configurations

By admin March 29, 2026

Detailed guide on configuring Netplan on Ubuntu for static IP, Bridge, and Bonding. Practical tips to help IT engineers avoid YAML errors and manage server networking efficiently.

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.

Network

How to Use nmap for Network Scanning and Linux Server Security Auditing

By admin March 6, 2026

A practical guide to using nmap for port scanning, service detection, and Linux server security auditing — drawn from real infrastructure management experience. Covers basic commands, NSE scripts, and an automation script for weekly audits.