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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: Container, Debug, Linux, LXD, 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, Kubernetes
Ceph installation inside Kubernetes can be provisionned 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, Deep Learning, Jupyter, Linux, AI, 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, Network, VLAN, Docker
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