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today's leftovers

Submitted by Roy Schestowitz on Thursday 16th of December 2021 02:17:46 PM Filed under
Misc
  • Blatant Self-Promotion

    Liam Proven's NixOS and the changing face of Linux operating systems is a very interesting discussion of Linux distros and package management. He starts by discussing radical restructuring of Linux distros, focusing on NixOS and GoboLinux. Then he looks at less radical alternatives:

    So, instead of re-architecting the way distros are built, vendors are reimplementing similar functionality using simpler tools inherited from the server world: containers, squashfs filesystems inside single files, and, for distros that have them, copy-on-write filesystems to provide rollback functionality.

    The goal is to build operating systems as robust as mobile OSes: periodically, the vendor ships a thoroughly tested and integrated image which end users can't change and don't need to. In normal use, the root filesystem is mounted read-only, and there's no package manager.

  • Persistency management of memory based filesystem on OpenBSD

    For saving my SSD and also speeding up my system, I store some cache files into memory using the mfs filesystem on OpenBSD. But that would be nice to save the content upon shutdown and restore it at start, wouldn't it?

    I found that storing the web browser cache in a memory filesystem drastically improve its responsiveness, but it's hard to make measurements of it.

  • Secure your Kubernetes deployments with eBPF | Red Hat Developer

    Numerous adaptations of the Linux kernel—notably seccomp, SELinux, and AppArmor—bolster its security through runtime checks on sensitive activities such as file access and system calls (syscalls). In particular, seccomp denies access to system calls that don't match rebuild profiles of allowed calls. But the creation of seccomp profiles for Kubernetes workloads can be a major obstacle to deploying containerized applications. Those profiles have to be maintained over the complete life cycle of the application because changing the code might require changes to the seccomp rules as well.

    To overcome this burden, it would be absolutely stunning if developers could record seccomp profiles by running a test suite against the application and automatically deploy the results together with the application manifest. But how to record seccomp profiles? Well, the Security Profiles Operator in Kubernetes offers several ways to record activity. This article shows how to use the Operator to secure your applications and how the recorder that uses extended Berkeley Packet, eBPF (or just BPF) does the job.

  • An elegant way to performance test microservices on Kubernetes

    Application programming interfaces (APIs) are the core system of most services. Client, web, and mobile applications are all built from APIs. They sit on the critical path between an end-user and a service, and they're also used for intra-service communication.

    Because APIs are so critical, API performance is also essential. It doesn’t matter how well-built your front-end application is if the API data sources it accesses take several seconds to respond. This is especially true in a world of microservices, where services depend on each other to provide data. In my opinion, the best feature your API can offer is great performance.

    To measure API performance, you need to benchmark your APIs as reliably as possible, which can be challenging. The optimal approach depends on your performance objectives. In this article, I'll guide you through an elegant process for measuring the performance of backend applications running on Red Hat OpenShift or Kubernetes. You'll also learn how to use Vegeta, a versatile HTTP load testing and benchmarking tool written in Golang. We will deploy Vegeta on OpenShift and run performance tests in both standalone and distributed modes.

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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.

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