How to Set Up a Full Remote Desktop Access on Ubuntu Server with VNC, noVNC, Websockify, and Nginx

30. April 2025 | Linux Containers | Docker | LXC | runc

Accessing a full Ubuntu graphical desktop environment via a simple web browser on Port 80 sounds impossible?Not anymore.In this post, we’ll walk through everything we needed to achieve exactly that – step-by-step, clean, and reliable. You’ll also get a complete cheat...

Docker Demystified: What Really Happens Behind Images, Containers & Layers 🚀

30. April 2025 | Docker

„You don’t truly understand Docker until you stop thinking in commands and start thinking in layers.“ Welcome to the ultimate deep-dive into Docker’s internal architecture – beyond the typical „10 must-know commands“ and into what really makes...

How to Harden Your Ubuntu Server: A Step-by-Step Guide

28. April 2025 | Linux | Ubuntu | CentOS

When you deploy a new Ubuntu server — whether on Google Cloud, AWS, or any other platform — it’s essential to harden it immediately.This minimizes attack surfaces and protects your system from unauthorized access. Here’s a complete guide to basic, essential...

How to Set Up Apache Guacamole on Google Cloud Platform (GCP)

28. April 2025 | GCP

If you want a remote desktop accessible directly from your browser, Apache Guacamole is the perfect lightweight solution.This guide shows you, step-by-step, how to deploy Guacamole on a Google Cloud Platform (GCP) virtual machine. Step 1: Prepare Your GCP Project...

Exploring a POP3 Server Over Port 110 Using the Terminal

28. April 2025 | unix

  Exploring a POP3 Server Over Port 110 Using the Terminal Once you have a connection to a POP3 server over Port 110, you can do a lot more than just check if the port is open — you can actually explore the server, see what mail software („mailer“)...

How to Fix Homebrew Build Failures After Installing Full Xcode on macOS

28. April 2025 | DevOps Engineering & Linux Engineering, unix

If you’ve installed full Xcode from the Mac App Store but Homebrew still fails when building packages like telnet, the problem is usually that macOS is still pointing to the lightweight Command Line Tools instead of full Xcode. Here’s how to fix it: Step 1 —...

Day 2 Task: Minimal Container with a Private Root Filesystem

27. April 2025 | runc Lab

Day 2 Task: Minimal Container with a Private Root Filesystem Goal:Manually mount a minimal filesystem and run a process inside it, fully isolated. Step 1 — Create a minimal root filesystem On your lab machine: bash KopierenBearbeiten mkdir -p ~/mycontainer/rootfs sudo...

Day 1 Task: Build a Basic Isolated Shell

27. April 2025 | runc Lab

Day 1 Task: Build a Basic Isolated Shell Goal:Start a real shell process isolated into its own namespaces,limited by a cgroup that restricts CPU usage. Step 1 — Create a new isolated shell On your lab machine: bash KopierenBearbeiten sudo unshare –fork...

runc: a tiny „mini-lab“ environment setup

27. April 2025 | runc

Perfect, let’s keep it simple and practical. Here’s your Mini-Lab Setup: 1. Create a safe playground machine You don’t want to mess up your main workstation by mistake.The best is a small, disposable virtual machine. Options: Use VirtualBox (free) +...

runc is like the „actual hands“ that create containers

27. April 2025 | Linux Containers | Docker | LXC | runc, runc

runc is: A tiny but critical tool for containers. It’s a command-line utility that can create and run containers according to the Open Container Initiative (OCI) spec. It’s actually what Docker (and many other container systems) use under the hood to start and manage...