Linux With Jack

10 Linux Commands I Use Every Day

Mon, 01 Jan 0001 00:00:00 +0000

TBC

About

Mon, 01 Jan 0001 00:00:00 +0000

I’m Jack, a Linux Sysadmin transitioning into HFT infrastructure. I have around 3 years of professional Linux experience, most recently working on Linux Infrastructure — provisioning, decommissioning, patching, Ansible, Foreman, and troubleshooting.

I’m at the start of my HFT journey. I don’t have all the answers, and I’m using this blog to document what I learn as I go.

My Career Path So Far

EUC (End User Computing) → Linux Sysadmin → Transitioning to Linux HFT Infrastructure

Contact

Mon, 01 Jan 0001 00:00:00 +0000

Let’s connect. I’m active on the platforms below and always happy to chat about Linux, infrastructure, or HFT.

How I Went From EUC To Linux Sysadmin

Mon, 01 Jan 0001 00:00:00 +0000

TBC

Lessons Learned During My First Year As A Linux Sysadmin

Mon, 01 Jan 0001 00:00:00 +0000

TBC

My 2026 Homelab Architecture

Mon, 01 Jan 0001 00:00:00 +0000

This is my homelab as of 2026. Most of this hardware was inherited or cobbled together over time. It’s modest, it’s not perfectly organized yet, and I’m still figuring out what I want it to be. But it’s mine, and it’s where I learn.

Rack & Networking

The gear lives in a Tecmojo 12U rack. Networking is handled by:

Netgear Nighthawk RAX70 — Router
Netgear GS316EP — 16-Port Gigabit Ethernet PoE+ Smart Switch

Nothing fancy. The switch gives me PoE for when I want to play with access points or cameras, and the RAX70 handles routing and Wi-Fi. I’ll likely replace the router with something more capable down the line — this was what I had available.

My Fedora Server Baseline Configuration

Mon, 01 Jan 0001 00:00:00 +0000

TBC

Now

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This is a /now page — what I’m focused on right now.

Last updated: May 2026

Currently

I’m in the middle of transitioning from a Linux Engineering role into HFT Infrastructure. I’m handing over my existing duties while ramping up on low-latency systems, kernel tuning, and high-performance networking.

Learning: Everything I can about HFT infrastructure — kernel bypass, NIC tuning, NUMA awareness, and low-latency patterns
Reading: Linux Observability with BPF by David Calavera and Lorenzo Fontana
Homelab: Gradually expanding my rack. Current hardware is mostly inherited/old. I plan to build this out further as I learn.
Work: Handing over Linux infrastructure duties — documentation, runbooks, and knowledge transfer

Next Up

Get my homelab services organized and documented
Explore eBPF for observability
Write more honestly about the transition from EUC → Linux → HFT

Understanding systemd Through Real Examples

Mon, 01 Jan 0001 00:00:00 +0000

TBC

Uses

Mon, 01 Jan 0001 00:00:00 +0000

A running list of the hardware and software I use. Most of this gear was inherited or pieced together over time. I still plan to build this out further.

Hardware

Rack

Tecmojo 12U Rack
Netgear Nighthawk RAX70 — Router
Netgear GS316EP — 16-Port Gigabit Ethernet PoE+ Smart Switch

NAS

QNAP TS-253A — Running a few containers (Pi-hole, Homer dashboard, Semaphore, Uptime Kuma)

Servers

Lenovo S500 SFF
- Intel Core i7-4790S @ 3.2GHz
- 8GB RAM
- 1TB HDD
2x ThinkCentre M92p (Type 3237)

What I Learned This Week #1

Mon, 01 Jan 0001 00:00:00 +0000

TBC

Why I Run Fedora Server Instead Of Ubuntu

Mon, 01 Jan 0001 00:00:00 +0000

TBC