The journal

News, analysis and practical guides on development, networks and systems. The latest publications first.

381 publications

The proposal keeps HDMI VRR signalling active across desktop/game boundaries. The desktop can still use fixed cadence; this does not increase game FPS.
SysadminNews

AMDGPU: understanding HDMI Passive VRR

AMD proposes keeping compatible HDMI displays in VRR signalling mode on the desktop. What the patches change, and why Linux 7.4 is not a delivery promise.

The merged change moves the ATL loading request after the AMD64 EDAC checks. An absent module is not enough to determine whether ECC is enabled or memory is healthy.
SysadminNews

Linux 7.3: AMD ATL loads only when needed

The AMD ATL change avoids unnecessary module loading on Zen systems without enabled DRAM ECC. What this means for logs and memory-error monitoring.

LUO hands supported resource state across kexec, then reconstructs access under the new kernel. Ordinary process execution and every descriptor do not transparently cross this boundary.
SysadminNews

systemd 262-rc1: what LUO sessions preserve

LUOSession connects services to kernel live-update sessions. It does not transparently preserve every process, descriptor or device across a kernel replacement.

Simplified contractual flow: OpenAI pays rent to SB Energy; NVIDIA provides conditional credit support for defined obligations. The $105B ceiling covers the initial 4.25 IT-GW scope across phases and does not represent an immediate payment. Separate $1.5B investment shown independently.
SysadminNews

NVIDIA’s $105B Ohio guarantee: what it covers

PORTS-Pike combines an OpenAI lease, SB Energy construction and NVIDIA credit support. The guarantee ceiling is neither immediate spending nor completed capacity.

Mint preview policy map: protection prevents cleanup; known tracked series have an update mechanism, custom tracked series need their own, and untracked unprotected series are cleaned up. This is an explanatory map, not a screenshot of a shipped interface.
SysadminNews

Linux Mint previews kernel retention by series

Mint’s planned kernel manager distinguishes tracked, custom and protected kernels. Understand the cleanup policy and why environment changes need new sessions.

Nominal weight arithmetic using the complete 2.4T parameter count: 4.8 decimal TB at two bytes each or 1.2 TB at an ideal four bits each. The 95B active subset is not the full expert storage footprint. Runtime overhead is excluded.
DevNews

Qwen3.8 weights are out: Max and 27B differ

Qwen3.8’s released 2.4T weights are text-only and require thinking. The 27B model supports vision; licensing and memory needs differ from the hosted Max service.

Fictional service startup: 10ms kernel, 40ms userspace and 150ms application total 200ms. Halving only the kernel segment yields 195ms overall, 2.5% less. This is not a NetBSD measurement.
SysadminNews

NetBSD 11: a 10ms kernel is not a 10ms service

NetBSD 11 adds stable RISC-V support and a lean x86 MICROVM kernel. The project’s boot figure excludes the separate question of when your application is ready.

SysadminNews

EU Opens Bidding for Seven AI Gigafactories

The European Commission opened its AI Gigafactories call on July 30, 2026: up to seven sites, 75,000 to 100,000 chips each, bids close November 12.

SysadminNews

Nscale Buys Anyscale, the Company Behind Ray

Nscale agreed on July 30, 2026 to acquire Anyscale, adding an orchestration layer above its GPU fleet. Ray itself stays governed by the PyTorch Foundation.

DevNews

Valve Pays Collabora to Port RADV to Windows

Collabora has RADV, Mesa's open source Vulkan driver for AMD GPUs, running Counter-Strike 2 on Windows. Valve funds it, and the kernel interface is the blocker.

SysadminNews

KVM Splits Its God Struct Ahead of Linux 7.3

Paolo Bonzini merged the kvm-chainsaw branch, breaking struct kvm_mmu into three. No new feature, but a large piece of nested virtualization confusion goes away.

SysadminNews

Seven Stable Linux Kernels Shipped in One Day

Greg Kroah-Hartman released seven stable Linux kernels on July 24, from 5.10.261 up to 7.1.5, one of them carrying over 2,000 patches. Here is how to stage it.

DevGuide

The awk Cheatsheet: Process Text in Columns

A practical awk cheatsheet: print columns with $1 and $NF, set field separators with -F, filter rows by pattern, sum a column, and use BEGIN and END blocks.

NetworkGuide

dig and nslookup Cheatsheet: Query DNS Fast

A practical dig and nslookup cheatsheet: look up A, AAAA, MX, TXT, NS and CNAME records, trim noise with +short, trace from the root with +trace, and query @8.8.8.8.

SysadminGuide

Docker Commands Cheatsheet: The Everyday Ones

A practical Docker cheatsheet: run a container with docker run, list with ps, follow logs, exec into a shell, bring a stack up with compose, and prune disk.

Security

Bug Bounty Starter Guide for Sysadmins

A bug bounty starter guide for sysadmins: how your DNS, HTTP and Linux skills transfer, the five free tools I open, and the report shape that gets paid.

DevGuide

Build a Local AI Agent with Ollama + Qwen 2.5

How I run a local AI agent with Ollama and Qwen 2.5 in 2026: install on Windows, Linux or macOS, pick the model your VRAM fits, call it from Python and LangChain.

SysadminGuide

CentOS to Rocky Linux 9 Migration Playbook 2026

CentOS to Rocky Linux 9 migration, end to end: the in-place ELevate route, the fresh-install route, the pre-flight inventory, and the breaks that fail silently.

Dev

ChatGPT vs Claude vs Gemini 2026

A hands-on ChatGPT vs Claude vs Gemini comparison for 2026, ten real jobs tested through the APIs: code, research, writing, data, vision, cost and latency.

SysadminGuide

The chmod and chown Cheatsheet, Decoded

A practical Linux chmod and chown cheatsheet: the Permission denied fix with chmod +x, why 755 and 644 keep showing up, chown for ownership, and recursing safely.

SysadminGuide

Build a CTF Lab on Hyper-V: Full Walkthrough

Build a CTF lab on Hyper-V: three trust-segmented virtual switches, a Kali attacker, Metasploitable3 and a broken Windows 10, with pfSense in the middle for routing.

NetworkGuide

DNS over HTTPS Implementation Guide

DNS over HTTPS the way I roll it out: what DoH buys you (and what it does not), flipping it on for Windows, Linux and macOS, plus self-hosting and edge enforcement.

SysadminGuide

Fix: ESXi Host Not Responding in vCenter

ESXi host Not Responding in vCenter is almost always a dead management link, not a dead host. Restart hostd then vpxa, clear the log partition, check ports 902/443.

DevGuide

Git Rebase vs Merge: A Visual Workflow Guide

Git rebase vs merge, decided in one mental model and five real situations: branch diagrams before and after, the exact commands, and the rule I never break.

SEOGuide

How I Optimize Images for Website Speed in 2026

Image optimization techniques for 2026: why AVIF goes first with WebP and JPEG behind it, responsive srcset, the lazy-load plus LCP trap, compression, and CDN automation.

SecurityGuide

Linux Kernel Hardening: sysctl Checklist

Linux kernel hardening with sysctl: the 32 toggles I actually ship, grouped by subsystem and sorted by how much each one matters, plus a drift check.

NetworkGuide

Linux Networking Commands: ip and ss Cheatsheet

ifconfig and netstat are gone on most modern Linux installs. The iproute2 replacements you need: ip a, ss -tulpn, ip route, ip neigh, and a clean old-to-new map.

Network

MikroTik vs Ubiquiti for Home Networks (2026)

MikroTik vs Ubiquiti for a prosumer home network: matched stacks under 400 EUR, CLI vs UI, real routing protocols, Wi-Fi roaming, VPN, a 3-year cost breakdown.

Network

Network Config Across Linux Distros in 2026

Network config across Linux distros in 2026: netplan, ifupdown, NetworkManager, systemd-networkd and wicked compared, with the static IP recipe for each.

NetworkGuide

nmcli Cheatsheet: Manage Wi-Fi From the Terminal

A practical nmcli cheatsheet for NetworkManager: scan and connect to Wi-Fi, list saved connections, bring them up and down, check device status, and set a static IP.

Network

pfSense vs OPNsense for Home Networks (2026)

pfSense vs OPNsense for home networks, run side by side on one N100 mini-PC for years: UI, update cadence, plugins, real benchmarks, appliances, and which I pick.

NetworkGuide

PowerShell Networking Cheatsheet for Windows

A PowerShell networking cheatsheet: test a port with Test-NetConnection, read your IP and DNS with Get-NetIPConfiguration, find listening ports, resolve names.

NetworkGuide

Self-Hosted VPN with WireGuard: Setup Guide

Self-hosted WireGuard VPN on a 5 EUR VPS: pick split vs full tunnel, generate Curve25519 keys, write the server and client configs, and get NAT and DNS right.

SecurityGuide

SOC Homelab with Wazuh, Suricata and ELK

Build a SOC homelab with Wazuh, Suricata and the Elastic Stack on a spare VM: the single-node installer, agent enrolment, and test attacks you can fire yourself.

SysadminGuide

SSH Permission Denied (publickey): The Fix

Permission denied (publickey) is never mysterious once you read the handshake. The real causes in order, each with the exact command to confirm and fix it.

SysadminGuide

systemctl and journalctl Cheatsheet

A systemctl and journalctl cheatsheet: status to see if a service runs and why it died, restart, reload, enable --now, daemon-reload, and journalctl -u NAME -f.

SecurityGuide

Wazuh SIEM on a Budget: Pi, N100 or Cloud

Wazuh SIEM on a budget, three paths I actually run: a Raspberry Pi 5 under 100 EUR, an Intel N100 mini-PC, or a Hetzner CAX21 ARM node under 10 EUR a month.

SEOGuide

Web Accessibility and WCAG in 2026

Web accessibility in 2026: target WCAG 2.2 AA, fix the five issues that sink most sites (contrast, alt text, labels, link text, page language), and test it yourself.

SecurityGuide

WordPress Security Audit in 10 Steps (2026)

A WordPress security audit you run in about 90 minutes: PHP and WP versions, plugin CVEs, HTTP headers, htaccess, TLS, 2FA, xmlrpc, user enumeration, logs and backups.