DevOps

SHIFT: The Third Time I Tried Convergence

In 2013 I bought an Ubuntu Phone. Not because I needed a new phone, but because the demos kept showing one specific thing: plug the phone into a monit…

UTMP being phased out: - Why "who" returns empty output on modern ubuntu

So, while operating on an Ubuntu 25.10 I had to use who to check the session, and something weird happened it basically didn't work, for a simple comm…

Day 1 of My DevOps Journey: Linux File System Basics & Navigation

Prerequisites A Linux terminal or Windows Subsystem for Linux (WSL) Basic familiarity with using a terminal Linux file system A Linux file system is t…

Handmade Hero: A Systems Programming Odyssey

Handmade Hero: A Systems Programming Odyssey This post is the start of my Handmade Hero journey documentation. For those who do not know what Handmade…

How SSH Works—and How It Breaks (Part 2): Simulating a Man-in-the-Middle Attack

In this article, we’ll explore how a Man-in-the-Middle (MITM) attack works using a small Docker-based lab. We’ll simulate how an attacker can steal cr…

eBPF From Rust: The 34ms Ghost We Couldn’t See

When your profiler swears everything’s fast but your metrics are screaming bloody murder eBPF From Rust: The 34ms Ghost We Couldn’t See When your prof…

ERPGENEX Free Open-Source ERP Built on Frappe Framework

Full Install Guide (Ubuntu Server Frappe/Bench omnexa_core ) This guide walks you through a clean install on Ubuntu Server, from OS prep to a running …

Pause Scripts with 'Press Any Key' in Bash, CMD, PowerShell, and macOS

Batch files and shell scripts often need a short wait so a double-clicked window or installer log stays visible. Windows CMD has a dedicated pause com…

Remade the 1991 Classic "Gorillas" in Python—and Survived the Snapcraft Journey

The Nostalgia Hit 🍌 Remember the two gorillas standing on a skyline, tossing exploding bananas at each other? I decided to bring that back. I built a …

Azure Monitor: Deployment and Configuration

Introduction Azure Monitor is a powerful cloud-based monitoring solution that provides full visibility into the performance, health, and activity of a…

The Cheapest Way to Self-Host Beszel in 2026

Datadog charges $15/host/month. You have 5 servers. That's $75/month to see CPU graphs. Beszel does the same job with an agent that uses less than 10M…

Why Docker Breaks Inside MicroVMs (Part 1): The Linux Assumptions You Didn’t Know You Were Relying On

We tried running Docker inside a microVM. It failed before the first container even started. The error wasn’t helpful: cgroup mountpoint does not exis…

Hack The Box - Snapped Writeup

Machine: Snapped Difficulty: Hard OS: Linux Overview Snapped is a hard-difficulty Linux machine that chains two recent CVEs to go from unauthenticated…

A Quick Look At The Proc Filesystem

When looking through the filesystem of a Linux system you may notice a directory named /proc . It's a fascinating directory which exposes many of the …

Arch Linux now has a bit-for-bit reproducible Docker image

Breaking Down Linux File-System

In Linux, everything is a file —not just text documents or executables, but also devices, network sockets, and even running processes. This idea turns…

How to Fix Linux Suspend Draining Your Battery Overnight

You close your laptop lid, toss it in your bag, and head home. The next morning you open it up to find a dead battery and a warm chassis. Sound famili…

How I Ship systemd Logs to CloudWatch for $0 (Django + Celery on EC2)

Running Django and Celery as systemd services on EC2 and tired of SSH-ing in to debug? Here's the exact setup I used to ship logs to CloudWatch Logs f…

How Linux is Used in Real-World Data Engineering

So, you know Python and think, "Hey, why don't I get into Data Engineering?" You have your learning checklist ready to go, but there’s a giant, termin…

Running k3s on Proxmox: A Multi-Node Cluster with a VM and LXC Worker — The Hard Way and Back

A practical guide covering installation, troubleshooting, and the real story of getting k3s to run inside an LXC container Introduction Kubernetes is …

Отказоустойчивый балансировщик 3proxy для n8n в Docker: лечим DNS-таймауты и ошибки доступа

Разбираем настройку отказоустойчивого балансировщика 3proxy для n8n в Docker. Фиксим DNS-затупы на 26 секунд через внутренний резолвер 127.0.0.11 и ре…

Феномен OpenClaw: почему инженерная обвязка стала важнее нейросети

В этом интервью мы поговорили с Chief AI Architect Андреем Носовым о феномене OpenClaw, который набрал популярность на GitHub быстрее, чем Linux. Мы ч…

reptyr: Move a Running Process Into tmux After Forgetting to Start It

Originally published at recca0120.github.io You SSH'd in and started a job that will run for hours. No tmux. No nohup. Now you need to leave, and clos…

sslh: Run HTTPS and SSH on Port 443 at the Same Time

Originally published at recca0120.github.io The corporate or university network only allows ports 80 and 443 out. SSH on 22 is blocked. Getting back t…

Docker Container Keeps Restarting: Diagnosis and Fix Guide

Docker Container Keeps Restarting: Diagnosis and Fix Guide If docker ps shows your container in a perpetual restart loop, here's the systematic way to…

A Cross-OS Port Finder in Rust — One CLI, Three Completely Different Data Formats

A Cross-OS Port Finder in Rust — One CLI, Three Completely Different Data Formats A tiny Rust CLI that answers "who is holding port 3000?" on macOS, L…

I built a log analyzer, and it found real attacks on my own machine

I am documenting every day of my cybersecurity learning journey publicly. This post covers Days 8 through 12 — the first half of Week 2. The log analy…

Incident Report: Service failure due to storage full

Yesterday, my homelab server suddenly became unresponsive. It started with a flurry of Discord notifications, the universal signal that something has …

Why I built procscope instead of just using Tracee or Falco

If you work in cloud security, you are probably exhausted by the acronym soup of eBPF tools. From Sysdig's Falco to Aqua's Tracee and Isovalent's Tetr…

请问下，有什么方式可以找到是哪个registry卡住的呢？

我配置有多个registry，但是运行pull 镜像的时候卡住了： { "registry-mirrors" : [ "https:\/\/dockerproxy.com", "https:\/\/docker.mirrors.ustc.edu.cn…