linux server Archives - ITFROMZERO

Installing Prometheus, Grafana, and Node Exporter on Fedora Server: A Production-Ready Monitoring Stack

By IT From Zero October 7, 2026

Step-by-step setup of the Prometheus, Grafana, and Node Exporter monitoring stack on Fedora Server. Includes standard config files, firewall setup, and dashboard ID 1860 for intuitive server resource tracking.

Network

How to Configure DNSSEC on BIND9: Digitally Signing and Validating DNS Records to Prevent Cache Poisoning

By IT From Zero October 5, 2026

A step-by-step guide to configuring DNSSEC on BIND9: generate KSK/ZSK keys, enable automatic zone signing, and synchronize DS records to prevent DNS cache poisoning.

Ubuntu

How to Install Tailscale on Ubuntu: Create a Mesh VPN Without Port Forwarding

By IT From Zero October 4, 2026

A step-by-step guide to installing and configuring Tailscale on Ubuntu. Set up a secure WireGuard Mesh VPN for remote server access without opening ports or buying static IPs.

Centos

Configuring Keepalived on CentOS Stream 9: A Practical High Availability Solution

By IT From Zero September 20, 2026

Protect your web system from unexpected downtime. A detailed guide on installing Keepalived on CentOS Stream 9 to create a professional failover mechanism.

Database

Manticore Search: The Lifesaver Alternative to Elasticsearch When Server RAM Runs Out

By IT From Zero September 12, 2026

Manticore Search is the perfect Elasticsearch alternative for low-spec servers. This guide covers installation, optimization, and real-world big data tips on Linux.

Centos

Mastering Firewalld IP Sets on CentOS Stream 9: Block Thousands of IPs Instantly

By IT From Zero September 9, 2026

Block thousands of attacking IPs with a single command. A detailed guide on using Firewalld IP Sets on CentOS Stream 9 to optimize security and performance.

Virtualization

Configuring Serial Console for KVM and Proxmox: A ‘Lifeline’ When SSH Suddenly Drops

By IT From Zero September 7, 2026

Losing SSH access is a Sysadmin's nightmare. This guide shows you how to configure Serial Console for KVM and Proxmox to quickly access VMs for recovery and easily copy-paste commands.

Network

Configuring DNS Split-Horizon with BIND9: The IP “Splitting” Trick for LAN and Internet

By IT From Zero September 2, 2026

Learn how to configure DNS Split-Horizon with BIND9 to distribute internal IPs for LAN and Public IPs for the Internet. Optimize speed and reduce Firewall load.

Ubuntu

Still Vulnerable After Updating Ubuntu? Use needrestart to Fix It Properly

By IT From Zero August 30, 2026

Is an APT update enough? Learn how to use needrestart to manage service restarts, keeping your Ubuntu server secure without unnecessary reboots.

Security

Installing Endlessh: How to Trap Attack Bots in an Infinite SSH Loop on Linux

By IT From Zero August 28, 2026

Learn how to install Endlessh to create an SSH Tarpit, a technique to trap attack bots in an infinite loop, protecting Linux servers and wasting attacker resources.