sysadmin Archives - Page 3 of 23 - ITFROMZERO

How to Join Fedora Server to Microsoft Active Directory Using realmd and SSSD

By IT From Zero October 21, 2026

A step-by-step guide to integrating Fedora Server into Microsoft Active Directory using realmd and SSSD. Covers architecture comparisons, automatic home directories, sudo delegation for AD groups, and offline cache verification.

VMware

Configuring Nested Virtualization on VMware ESXi to Build a Multi-Node vSphere Lab

By IT From Zero October 20, 2026

A detailed guide on enabling Nested Virtualization on VMware ESXi to build a complete enterprise-grade vCenter, HA, and vSAN lab on a single physical server.

Fedora

How to Install and Configure BorgBackup on Fedora Server: Automating Data Backups over SSH

By IT From Zero October 20, 2026

A comprehensive guide to setting up BorgBackup on Fedora Server. Leverage deduplication to save 80% disk space, secure backups with AES encryption, and automate via Systemd timers.

Virtualization

Migrating VirtualBox VMs to KVM/Proxmox VE: Converting VDI to QCOW2 and Fixing VirtIO Boot Errors

By IT From Zero October 19, 2026

Experiencing a BSOD or boot freeze after migrating VirtualBox to KVM/Proxmox VE? Learn how to convert VDI to QCOW2 with qemu-img and properly inject VirtIO drivers for both Windows and Linux.

Ubuntu

Optimizing RAM on Ubuntu with zRAM and Swap for Low-End VPS

By IT From Zero October 18, 2026

Combining high-speed zRAM with a fallback Swap file keeps 1GB–2GB RAM Ubuntu VPS instances stable and crash-free during traffic spikes. Full setup with practical sysctl tuning.

Fedora

Installing Headscale on Fedora Server: Self-Host a Private Tailscale Mesh VPN

By IT From Zero October 18, 2026

A practical guide to deploying a Headscale coordination server on Fedora Server to run your own WireGuard mesh VPN. Optimize direct P2P connections, configure subnet routing, and troubleshoot common real-world routing issues.

Virtualization

How to Configure KVM Nested Virtualization on Linux: Enable Nested Virtualization for Proxmox, VMware, and OpenStack Labs

By IT From Zero October 18, 2026

Encountering 'KVM acceleration not available' when installing Proxmox or ESXi inside a Linux VM? Here is how to configure KVM Nested Virtualization for nested labs.

VMware

How to Configure Port Mirroring on a vSphere Distributed Switch to Capture Packets with Wireshark

By IT From Zero October 17, 2026

Troubleshooting intermittent VM network issues when local tools are restricted? Learn how to configure Port Mirroring on a VMware vSphere Distributed Switch to capture and analyze traffic safely with Wireshark.

Ubuntu

A Practical Guide to Configuring and Managing AppArmor on Ubuntu: Application Security and Isolation

By IT From Zero October 17, 2026

Comprehensive guide to configuring AppArmor on Ubuntu. Harden Nginx and MySQL, prevent privilege escalation, and isolate services with minimal resource overhead.

Centos

How to Install and Configure Nextcloud on CentOS Stream 9: Build Your Own Private Cloud

By IT From Zero October 17, 2026

A cost comparison between Public Cloud, NAS, and Private Cloud, featuring a step-by-step guide to installing Nextcloud on CentOS Stream 9 with Apache, MariaDB, and PHP 8.2.