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Containers & Events

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  • Video: Containers Should Contain... Right?

    Here's a presentation video from the very recent OpenStack Summit Vancouver 2018. The topic repeats what Dan Walsh was saying a couple of years ago. Again, this is talking about application containers using traditional kernel features like namespaces and cgroups... because as we all know, in the Linux kernel, containers are NOT a REAL thing.

    Just to be clear, OpenVZ... which is a mature out-of-tree patch for system containers that has been around and maintained for well over 13 years... does contain... but the hype is all around application containers like Docker and its work-alikes.

  • Updates in container isolation

    At KubeCon + CloudNativeCon Europe 2018, several talks explored the topic of container isolation and security. The last year saw the release of Kata Containers which, combined with the CRI-O project, provided strong isolation guarantees for containers using a hypervisor. During the conference, Google released its own hypervisor called gVisor, adding yet another possible solution for this problem. Those new developments prompted the community to work on integrating the concept of "secure containers" (or "sandboxed containers") deeper into Kubernetes. This work is now coming to fruition; it prompts us to look again at how Kubernetes tries to keep the bad guys from wreaking havoc once they break into a container.

  • Autoscaling for Kubernetes workloads

    Technologies like containers, clusters, and Kubernetes offer the prospect of rapidly scaling the available computing resources to match variable demands placed on the system. Actually implementing that scaling can be a challenge, though. During KubeCon + CloudNativeCon Europe 2018, Frederic Branczyk from CoreOS (now part of Red Hat) held a packed session to introduce a standard and officially recommended way to scale workloads automatically in Kubernetes clusters.

    Kubernetes has had an autoscaler since the early days, but only recently did the community implement a more flexible and extensible mechanism to make decisions on when to add more resources to fulfill workload requirements. The new API integrates not only the Prometheus project, which is popular in Kubernetes deployments, but also any arbitrary monitoring system that implements the standardized APIs.

  • An introduction to MQTT

    A few years ago, I was asked to put temperature monitoring in a customer's server room and to integrate it with their existing monitoring and notification software. We ended up buying a rack-mountable temperature monitor, for nearly £200, that ran its own web server for propagating temperature data. Although the device ostensibly published data in XML, that turned out to be so painful to parse that we ended up screen-scraping the human-readable web pages to get the data. Temperature sensors are fairly cheap, but by the time you've wrapped them in a case with a power supply, an Ethernet port, a web server, enough of an OS to drive the above, and volatile and non-volatile storage for the same, they get expensive. I was sure that somewhere there must be physically-lightweight sensors with simple power, simple networking, and a lightweight protocol that allowed them to squirt their data down the network with a minimum of overhead. So my interest was piqued when Jan-Piet Mens spoke at FLOSS UK's Spring Conference on "Small Things for Monitoring". Once he started passing working demonstration systems around the room without interrupting the demonstration, it was clear that this was what I'd been looking for.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.