This little tutorial will show you how to turn an Ubuntu Droplet (VM) on DigitalOcean into a NixOS Droplet using nixos-infect. NixOS is a Linux distribution declaratively configured using a specification written in the Nix expression language describing the system’s desired state. It supports automatic upgrades and rollbacks. Aside from DigitalOcean, you can run NixOS on most common computers. It’s possible to run NixOS on ARM64 computers, like on the Raspberry Pi 3 and Raspberry Pi 4.

In this tutorial, we’ll create a NixOS virtual machine using Vagrant. This setup can be helpful to set up an environment for learning NixOS. NixOS is a Linux distribution declaratively configured using a specification written in the Nix expression language describing the system’s desired state. It supports automatic upgrades and rollbacks. If something goes wrong, just revert to the working state. NixOS runs on common computers and architectures and can be used both on laptops or workstations with a desktop environment or on servers, both x86_64 and ARM64, like on the Raspberry Pi 4.

This guide will help you set up a Kubernetes cluster, including a service mesh using k3s (at the time of writing at version 0.10.2) and Rio. We’ll deploy the cluster on DigitalOcean. Ubuntu 18.04 LTS will be the OS during this tutorial. If you sign up to DigitalOcean using this link, you’ll receive $50 to spend on their services over 30 days. If you wish to run your cluster on your own hardware, you could do so on Raspberry Pis (ARM64) or Intel NUCs (x86_64) for example.

In this tutorial we’ll install vagrant-libvirt on a Mac running macOS (tested on High Sierra and Mojave). vagrant-libvirt is a plugin for Vagrant that allows you to interact with libvirt virtualization hosts, local or remote. Vagrant can be used to build and manage virtual machines and is useful for development. Vagrant runs most platforms, including the MacBook Air and Raspberry Pi. Libvirt is a “toolkit to manage virtualization platforms” and supports a variety of virtualization backends, including, but not limited to, KVM, QEMU, Xen, VMWare, and LXC.

This tutorial will show the upgrade process for Fedora from version 30 to version 31. Fedora is a Linux distribution aimed at servers, workstations, and all kinds of use cases. It runs on both x86_64 and ARM64, and other platforms. This tutorial is aimed at Fedora Server, but it should work the same on Fedora Workstation. Prepare First of all, make a backup of your system. System upgrades should work fine, but from time to time they break.

In this tutorial, we’ll deploy Bitwarden on Docker Swarm. It’s based on an earlier tutorial on this site, where we deployed Docker Swarm on DigitalOcean. Bitwarden is a password manager with support for self-hosting. We’ll use bitwarden_rs, an unofficial Bitwarden API server implementation, as it’s a bit faster than the default implementation. Bitwarden_rs is written in Rust and is compatible with the official Bitwarden clients. Bitwarden has the following features, among others: