Tutorials

Step-by-step guides with the exact commands you need, most with a video walkthrough.

VPN & Networking Easy VPN Setup with WireGuard ManagerMay 18, 2025
Set up a WireGuard VPN in minutes with wireguard-manager, a free script for Debian and Ubuntu: install, add or remove clients and generate mobile QR codes.
Self-Hosting & Servers Mastering OpenStack: A Beginner’s Guide Video SeriesFebruary 12, 2025
A 5-part OpenStack video series for beginners: install it on Ubuntu in VirtualBox, launch instances, set up networking and SSH, upload images, use the CLI.
Linux & Command Line Mastering grep: A Quick Guide to Searching Text in Files on macOS and LinuxSeptember 3, 2024
Learn grep with practical examples: case-insensitive, recursive and whole-word searches, line numbers, excluding matches and filtering logs on Linux and Mac.
Self-Hosting & Servers How to Set Up Matrix/Synapse Server with DockerApril 21, 2024
Commands to self-host a Matrix Synapse chat server: install Docker, deploy Synapse with Docker Compose and create users. Follow along with the video.
Linux & Command Line How to Install Java on Debian-based LinuxApril 3, 2024
Install Java on Ubuntu, Debian and other Debian-based Linux: check your version, choose an OpenJDK or JRE package, install it and set the default.
SSH & Security OpenSSH Step-by-Step TutorialJanuary 4, 2024
Learn to connect to a remote server with OpenSSH: password authentication, key-based login with SSH keys and connecting on a non-default port. Video guide.
SSH & Security Set Up X11 Forwarding for Remote Graphical ApplicationsDecember 28, 2023
Run graphical apps from a remote server over SSH: install an X server (XQuartz, Xming), enable X11Forwarding in sshd_config and connect with ssh -X or -Y.
Linux & Command Line Installing Graylog 5 on Debian: A Step-by-Step GuideDecember 27, 2023
Install Graylog 5 on Debian step by step: dependencies, MongoDB, Elasticsearch and the Graylog server, configured and ready to start collecting logs.
macOS Enable the Root User on macOSSeptember 2, 2023
Check whether the root user is enabled on macOS, then enable or disable it from the Terminal with dsenableroot. Plus why you should be careful doing it.
Oracle Cloud Exploring Oracle Cloud’s Free Tier: Unleash the Power of Cloud ComputingAugust 30, 2023
What Oracle Cloud’s Free Tier includes, how the Always Free services work, and practical use cases for running websites, apps and labs at no cost.
SSH & Security Configure MFA for SSH with Google AuthenticatorJune 29, 2023
Add multi-factor authentication to SSH on Ubuntu with libpam-google-authenticator: set up the app, configure PAM and sshd_config, and require MFA per user.
SSH & Security Enable SSH Password AuthenticationJune 28, 2023
Cloud servers disable SSH password login by default. Here’s how to enable PasswordAuthentication in sshd_config, restart SSH and log in with a password.
Oracle Cloud How to Keep Oracle from Reclaiming Your Always Free InstancesJune 1, 2023
Got Oracle’s idle-instance warning email? Three ways to keep your Always Free OCI compute instances from being stopped and reclaimed for low usage.
Self-Hosting & Servers How to Install the ionCube Loader on HestiaCPApril 26, 2023
Install the ionCube Loader on a HestiaCP server so PHP can run ionCube-encoded files: download the right package (incl. ARM64), add it to php.ini, restart.
macOS How to Uninstall Java from macOSApril 12, 2023
Completely uninstall Java from macOS: check your installed version, find the JDK in /Library/Java/JavaVirtualMachines and remove it from the Terminal.
VPN & Networking Install WireGuard VPN on Ubuntu ServerFebruary 15, 2023
Install and configure a WireGuard VPN on a headless Ubuntu server: generate keys, set firewall rules and connect desktop and mobile clients. Video included.
macOS How to Create a Bootable USB from an ISO on Mac Using TerminalJanuary 26, 2023
Create a bootable USB drive from an ISO on macOS using only Terminal: find the disk with diskutil, unmount it and write the image with dd. No extra apps.
Oracle Cloud Host WordPress for Free on an Always Free Oracle Cloud ServerNovember 23, 2022
Host WordPress for free on an Always Free Oracle Cloud server: DNS, iptables, Apache, PHP, MariaDB and a free Let’s Encrypt SSL certificate, step by step.
macOS Install and Set the Default Java JDK Version on macOSSeptember 27, 2022
Install the latest Java JDK on macOS, switch the default Java version with JAVA_HOME and uninstall JDKs you no longer need, all from the Terminal.
Self-Hosting & Servers Free Minecraft Server on Oracle Cloud Free TierJuly 16, 2022
Run a free Minecraft Java server on Oracle Cloud’s Always Free tier: open port 25565, install Java 17 and keep the server running in a screen session.
Oracle Cloud Attach a Block Volume to Multiple Ubuntu Instances on Oracle Cloud with OCFS2July 6, 2022
Commands to attach one Oracle Cloud block volume to multiple Ubuntu instances using the cluster-aware OCFS2 file system. Follow along with the video.
macOS How to Install Homebrew on macOSMarch 9, 2022
Install Homebrew on macOS with one Terminal command, learn where it installs on Apple Silicon vs Intel Macs and verify it works with brew –version.