Sysadmin Desk

Infrastructure & Cloud

Hands-on guidance for infrastructure, virtualization, and containers — Hyper-V, VMware, Docker, and the day-to-day operations work that keeps environments running.

About MCSA Guru

2 guides

Diagram-style cover showing one compose.yaml file defining a web container and a database container connected on a shared Docker network

Pillar Guide

Docker & Containers

Docker Compose Beginner Guide: Run Multiple Containers with One File

Learn Docker Compose from scratch: write one YAML file to run multiple containers, with a working WordPress + MySQL example and the core up/down commands.

Sysadmin Desk May 26, 2026 10 min read

Diagram-style cover showing CPU virtualization extensions being claimed by the Windows hypervisor while VirtualBox waits for VT-x to be freed

Virtualization (Hyper-V, VMware, VirtualBox)

How to Fix VirtualBox VT-x Is Not Available (Conflict with Hyper-V)

VirtualBox says VT-x is not available (VERR_VMX_NO_VMX)? Here's how to free your CPU virtualization from Hyper-V, Memory Integrity, and WSL2 — and fix it for good.

Sysadmin Desk May 24, 2026 11 min read