Linux SysAdmin Archives - ITFROMZERO

Ubuntu LVM Configuration Guide: Create, Extend, and Manage Disks Online Without Data Loss

By IT From Zero October 31, 2026

Best-practice LVM configuration on Ubuntu Server: step-by-step guide to creating PVs, VGs, and LVs, plus zero-downtime online disk extension for SysAdmins and DevOps.

Fedora

How to Configure Chrony on Fedora Server: Setting Up an Accurate NTP Server for Your Local Network

By IT From Zero October 28, 2026

Configure Fedora Server as an internal NTP server using Chrony to keep all workstations and servers accurately synchronized down to the millisecond. This guide covers a rapid 5-minute setup alongside practical tips to maintain accurate time even during Internet outages.

Docker

Configuring Docker Macvlan Network: Assigning Static IPs from the Physical LAN to Containers

By IT From Zero October 27, 2026

A guide to Docker Macvlan configuration: assign physical LAN static IPs to containers, bypass NAT, and resolve host-to-container connectivity issues.

Centos

How to Configure Virtual Data Optimizer (VDO) on CentOS Stream 9: Optimize Storage with Compression and Deduplication

By IT From Zero October 7, 2026

A detailed guide on configuring LVM-VDO on CentOS Stream 9 for inline compression and deduplication, saving up to 80% disk space on VM and backup servers.

Centos

Rescuing CentOS Stream 9: Using Rescue Mode and Chroot to Fix GRUB Errors

By IT From Zero August 13, 2026

CentOS Stream 9 server won't boot? Don't worry. This guide will help you use Rescue Mode and Chroot to fix GRUB errors and restore your system in just a few steps.

Security

Mastering OpenSSL: From Creating Self-Signed Certs to ‘Lightning-Fast’ TLS Debugging

By IT From Zero July 24, 2026

Learn how to master OpenSSL CLI to create certificates, debug TLS handshake errors, and encrypt data files. Essential practical skills for Linux SysAdmins.