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19 articles · free tools · updated weekly

Enterprise IT, explained by someone who runs it

In-depth articles, hands-on labs, and free utilities covering virtualization, networking, cybersecurity, cloud, and applied AI — written from production experience, with the reasoning and the failure modes included.

No listicles, no vendor reprints, and no advice that quietly falls apart the first time it meets real traffic. Every architecture here has run somewhere, every command has been typed against a live system, and where something broke, that is written down too — the failure is usually the part worth reading.

  • Reference architectures with the trade-offs and the cost of each decision made explicit.
  • Step-by-step labs you can rebuild on your own hardware, start to finish.
  • Free browser-based tools for DNS, TLS, subnetting, and encoding — no sign-up, nothing logged.
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Latest articles

Newest first — long-form technical writing across the full infrastructure stack.

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Artificial Intelligence Beginner

What Agentic AI Actually Is

"Agentic AI" is the phrase that replaced "chatbot" the moment models stopped just answering and started doing. It is also badly overused — half the products wearing the label are a language model with a single API call b...

6 min read 771

Browse by topic

Thirteen areas of enterprise infrastructure, each with articles, labs, and downloads.

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Artificial Intelligence & Agentic AI

Practical AI for the enterprise: retrieval pipelines, agent architectures, model selection, evaluation, guardrails, and the infrastructure that keeps it all running.

6 articles →

Virtualization

VMware vSphere, Microsoft Hyper-V, Proxmox VE, and KVM — design, migration, performance tuning, and the licensing maths behind each platform.

2 articles →

Networking

Cisco, MikroTik, Ubiquiti, and Juniper in production. Routing, switching, VLAN design, BGP, QoS, and the troubleshooting workflow that finds the fault fast.

1 article →

Cybersecurity

Defensive security that survives contact with reality: hardening, detection engineering, identity, zero trust, incident response, and compliance frameworks.

2 articles →

Cloud

AWS, Azure, and Google Cloud — landing zones, networking, identity, cost management, and the migration decisions that are hard to reverse.

1 article →

Linux & Windows Server

Server operating systems in depth: systemd, Active Directory, Group Policy, performance analysis, patching strategy, and cross-platform integration.

1 article →

VoIP & Unified Communications

SIP, Asterisk, FreePBX, 3CX, and Microsoft Teams Phone. Call routing, codecs, SBCs, QoS, and diagnosing audio quality problems properly.

1 article →

Automation & DevOps

Ansible, Terraform, CI/CD, GitOps, and the scripting patterns that turn repetitive operations work into reviewable code.

1 article →

Storage & Backup

ZFS, Ceph, SAN and NAS design, snapshots, replication, and backup strategies that are actually tested rather than merely configured.

1 article →

Database & SQL

PostgreSQL, MySQL, and SQL Server — query tuning, indexing strategy, replication, high availability, and reading an execution plan without guessing.

1 article →

Hands-on labs

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Tutorial Intermediate

Recovering a Lost ESXi or vCenter Password

"Recover the vCenter password" is three different jobs wearing one sentence, and picking the wrong one wastes an afternoon. Before touching anything, decide which credential you have actually lost: The ESXi host root acc...

Lab Beginner

Lab: Build an Active Directory Environment on Hyper-V

This lab builds a working Active Directory environment on Hyper-V: two domain controllers, a member server, and a client, on an isolated network. It is the foundation for practising Group Policy, certificate services, re...

Tutorial Intermediate

PostgreSQL Index Strategy That Actually Works

Most "PostgreSQL is slow" tickets are an indexing problem, and most indexing problems come from adding indexes by intuition rather than by reading the plan. This is the method I use, and the specific index types that sol...

Downloads

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Proxmox Cluster Pre-Flight Checklist Cheat sheet · v2.1 · 961 downloads BGP Edge Router Configuration Template Config file · v1.4 · 824 downloads PostgreSQL Health Check Script Script · v3.0 · 687 downloads

Videos

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AI Agents Full Course 2026: Master Agentic AI 2:13:14 Claude in 29 Minutes 29:08 Claude Code Full Course: Build and Sell (2026) 4:10:43

Open source

Tooling that came out of the work described in these articles.

GitHub profile
pve-toolkit

Operational scripts for Proxmox VE clusters: health reporting, bulk VM operations, replication auditing, and pre-upgrade checks.

Shell 1K
bgp-guard

Generates prefix filters and RPKI validation config from an IRR object, for IOS-XE, Junos, RouterOS, and FRR.

Python 862
pg-index-advisor

Reads pg_stat_statements and suggests composite index definitions with the column ordering worked out, plus the CONCURRENTLY statements to create them.

Go 2K
unit-harden

Analyses a systemd unit, proposes a hardening drop-in, and iteratively tests which directives the service tolerates.

Rust 594

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