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NixOS: Enabling LXD virtual machines using Flakes
Categories: Hack, Learning | Tags: GitHub, Learning and tutorial, Linux, LXD, Packaging, VM, NixOS, Open source
Nixpkgs is an ever-increasing collection of software packages for Nix and NixOS. Even with more than 80,000 packages, you easily run in a situation where there is a functionality that is not yet…
May 13, 2022
Nix package creation: install a not yet supported font
Categories: Hack | Tags: Learning and tutorial, Linux, Packaging, GitOps, NixOS, Open source
The Nix packages collection is large with over 60 000 packages. However, chances are that sometimes the package you need is not available. You must integrate it yourself. I needed for some fonts which…
By David WORMS
Mar 29, 2022
Reliable and reproducible Linux installation with NixOS
Categories: Infrastructure, Learning | Tags: Arch Linux, CentOS, Linux, OS X, Packaging, Ubuntu, VM, NixOS, TDP
When using an operating system, upgrading packages or installing new ones are common tasks that introduce the risk of affecting the stability of the system. NixOS is a Linux distribution that ensures…
Feb 8, 2022
Nix introduction, main concepts and commands
Categories: Infrastructure, Learning | Tags: Arch Linux, CentOS, Linux, OS X, Packaging, Ubuntu, NixOS, TDP
Nix is a functional package manager for Linux and other Unix systems, making the management of packages more reliable and easy to reproduce. With a traditional package manager, when updating a package…
Feb 1, 2022
Desacralizing the Linux overlay filesystem in Docker
Categories: Containers Orchestration, Infrastructure | Tags: DevOps, File system, Linux, Docker
Overlay filesystems (also called union filesystems) is a fundamental technology in Docker to create images and containers. They allow creating a union of directories to create a filesystem. Multiple…
By David WORMS
Jun 3, 2021
Install and debug Kubernetes inside LXD
Categories: Containers Orchestration | Tags: Debug, Linux, LXD, Container, Docker, Kubernetes, Node
We recently deployed a Kubernetes cluster with the need to maintain clusters isolation on our bare metal nodes across our infrastructure. We knew that Virtual Machines would provide the required…
Feb 4, 2020
Rook with Ceph doesn't provision my Persistent Volume Claims!
Categories: DevOps & SRE | Tags: PVC, Linux, Rook, Ubuntu, Ceph, Cluster, Internship, Kubernetes
Ceph installation inside Kubernetes can be provisioned using Rook. Currently doing an internship at Adaltas, I was in charge of participating in the setup of a Kubernetes (k8s) cluster. To avoid…
Sep 9, 2019
TensorFlow installation on Docker
Categories: Containers Orchestration, Data Science, Learning | Tags: CPU, Jupyter, Linux, AI, Deep Learning, Docker, TensorFlow
TensorFlow is an Open Source software from Google for numerical computation using a graph representation: Vertex (nodes) represent mathematical operations Edges represent N-dimensional data array…
Aug 5, 2019
Recover from an EFI failure on a dedicated server
Categories: Hack | Tags: Infrastructure, Linux, Cloud
A few weeks ago, before upgrading our Ubuntu systems, we sort of messed around with our EFI partitions and the impacted servers never came back online on system reboot after the upgrade. Provisionning…
By Grégor JOUET
Apr 16, 2019
LXD: The Missing Piece
Categories: Containers Orchestration | Tags: CPU, Linux, LXD, VM, Docker, Kubernetes
LXD stands for Linux Container Daemon. Yet another container technology. But LXD is very different. It stands apart from the pack. It is not necessarily better nor much faster nor more secure! But it…
Dec 28, 2018
KVM machines for Vagrant on Archlinux
Categories: DevOps & SRE | Tags: Arch Linux, KVM, Linux, Virtualization, VM, Vagrant
Vagrant supports different providers to manage virtualization. In a Linux environment, you can dramatically improve VM performance by using the libvirt provider and the KVM hypervisor. This tutorial…
Sep 19, 2018
A CoreOS development cluster with Vagrant and VirtualBox
Categories: Hack, Infrastructure | Tags: Arch Linux, CoreOS, Linux, VirtualBox, etcd, Vagrant
Following CoreOS’s instructions on how to set up a development environment in VirtualBox did not work out well for me. Here are the steps I followed to get Container Linux up and running with Vagrant…
Jun 20, 2018
Network Namespace without Docker
Categories: Hack | Tags: DNS, Linux, Namespaces, VLAN, Docker, Network
Let’s imagine the following use case: I am connected to several networks (wlan0, eth0, usb0). I want to choose which network I’m gonna use when I launch apps. My app doesn’t allow me to choose a…
Jul 6, 2016
Node.js is now integrated to the Microsoft Azure platform
Categories: Cloud Computing, Tech Radar | Tags: Linux, Azure, Cloud, Node.js
Node is now a first class citizen in the Microsoft Azure cloud environment alongside .Net, Java and PHP. This integration is the logical consequence of Microsoft’s involvement in the development of…
By David WORMS
Dec 11, 2011