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.
11 guides
Understand and configure vmbr0, the Proxmox Linux bridge: how it works, editing /etc/network/interfaces, attaching VMs, adding a second bridge, and fixing no-internet issues.
How VMware snapshots and delta disks really work, why they grow and slow your VMs, the 72-hour rule, and why a snapshot is not a backup. Practical guidance.
Bind mount vs named volume in Docker: how they differ, when to use each, where data lives, permissions, backups, and the down -v data-loss trap.
Pillar Guide
An honest Proxmox VE vs VMware ESXi comparison after the Broadcom changes: licensing and cost, features, clustering, backup, hardware support, and who each one fits.
Hyper-V VM has no internet? Work through the virtual switch type, NAT setup, VM adapter, host firewall, and DNS to get your guest back online for good.
Fix the Docker 'port is already allocated' error: find what's using the port with docker ps, ss, and lsof, then free it or change the mapping.
Pillar Guide
Install Proxmox VE on a physical server from scratch: write the ISO to USB, boot the installer, pick ext4 or ZFS, set the network, and reach the web GUI on port 8006.
Create an external virtual switch in Hyper-V the right way. Switch types compared, Hyper-V Manager and New-VMSwitch steps, and how to avoid losing host network.
Pillar Guide
Install Docker on Ubuntu Server the right way: add the official apt repo and GPG key, install docker-ce plus the Compose plugin, and verify it works.
Pillar Guide
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.
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.