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today's howtos

Submitted by Roy Schestowitz on Wednesday 22nd of December 2021 12:05:35 AM Filed under
HowTos
  • Using Admission Controllers to Detect Container Drift at Runtime | Kubernetes

    At Box, we use Kubernetes (K8s) to manage hundreds of micro-services that enable Box to stream data at a petabyte scale. When it comes to the deployment process, we run kube-applier as part of the GitOps workflows with declarative configuration and automated deployment. Developers declare their K8s apps manifest into a Git repository that requires code reviews and automatic checks to pass, before any changes can get merged and applied inside our K8s clusters. With kubectl exec and other similar commands, however, developers are able to directly interact with running containers and alter them from their deployed state. This interaction could then subvert the change control and code review processes that are enforced in our CI/CD pipelines. Further, it allows such impacted containers to continue receiving traffic long-term in production.

    To solve this problem, we developed our own K8s component called kube-exec-controller along with its corresponding kubectl plugin. They function together in detecting and terminating potentially mutated containers (caused by interactive kubectl commands), as well as revealing the interaction events directly to the target Pods for better visibility.

  • Stupid RCU Tricks: Removing CONFIG_RCU_FAST_NO_HZ - Paul E. McKenney's Journal — LiveJournal

    The CONFIG_RCU_FAST_NO_HZ Kconfig option was added many years ago to improve energy efficiency for systems having significant numbers of short bursts of idle time. Prior to the addition of CONFIG_RCU_FAST_NO_HZ, RCU would insist on keeping a given idle CPU's scheduling-clock tick enabled until all of that CPU's RCU callbacks had been invoked. On certain types of battery-powered embedded systems, these few additional scheduling-clock ticks would consume up to 40% of the battery lifetime. The people working on such systems were not amused, and were not shy about letting me know of their dissatisfaction with RCU's life choices. Please note that “letting me know” did not take the form of flaming me on LKML. Instead, they called me on the telephone and yelled at me.

    Given that history, why on earth would I even be thinking about removing CONFIG_RCU_FAST_NO_HZ, let alone queuing a patch series intended for the v5.17 merge window???

    The reason is that everyone I know of who builds their kernels with CONFIG_RCU_FAST_NO_HZ=y also boots those systems with each and every CPU designated as a rcu_nocbs CPU. With this combination, CONFIG_RCU_FAST_NO_HZ=y is doing nothing but placing a never-taken branch in the fastpath to and from idle. Such systems should therefore run slightly faster and with slightly better battery lifetime if their kernels were instead built with CONFIG_RCU_FAST_NO_HZ=n, which would get rid of that never-taken branch.

  • BE CAREFUL WITH find + delete – find . -delete -name vs find . -name -delete

    one neat function of find, it that what it found can be passed to another function for further processing.

  • Nextcloud - Unable to Open Photos Library — Firstyear's blog-a-log

    It seems that Nextcloud is not sandboxed which means that macos enforces stricter permissions on what this can or can not access, which is what prevented the photos library from syncing.

  • How to compress PNG image file in Linux - Unixcop the Unix / Linux the admins deams

    PNG or Portable Network Graphics is an image file format meant to replace GIF.

    PNG utilizes lossless image compression, which results in high-quality images though sometimes they can be relatively big.

    Also if you have a lot of images, and want to compress them without losing its original quality There are plenty of GUI applications available which will help you to optimize the images.

    Here are two simple command line utilities to optimize images and they are:

    PNGquant and OptiPNG are programs that optimize PNG images to smaller size without losing any information or their original quality.

  • How to install Runescape on a Chromebook

    Today we are looking at how to install Runescape on a Chromebook. Please follow the video/audio guide as a tutorial where we explain the process step by step and use the commands below.

  • How to quickly back up and restore a database with phpMyAdmin - TechRepublic

    Many of your business processes depend on databases. Should one of those databases fail, your workflow could come to a standstill. That would cost you money, an outcome you certainly do not want.

    To avoid that, you need to back up those databases. I've already walked you through the process of doing so from the command line. This is most definitely a technique you should know. But there might be times when you want to work with a bit more efficiency, such as by way of a web-based GUI like phpMyAdmin. That, my friends, is exactly what I'm going to show you today.

    After you read how easy this is, you might never go back to the terminal for this task.

    Let's get to work.

  • How to install Nvidia graphics drivers on Pop_OS

    If a web-based GUI is better suited to your admin skills, Jack Wallen wants to show you how to back up and restore your MySQL/MariaDB databases with one of the easiest tools on the market.

  • How to upgrade to Pop_OS 21.10

    Pop_OS 21.10 is here! It comes with great new features like a brand new application launcher, Gnome Shell version 40, and many other things. In this guide, we’ll go over how to upgrade your system to the new Pop_OS 21.10.

»

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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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