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today's leftovers

Submitted by Roy Schestowitz on Thursday 15th of October 2020 03:41:08 PM Filed under
Misc

  • struct page, the Linux physical page frame data structure

    Linux manages physical memory by dividing it into PAGE_SIZE pieces. Usually this is the same as the CPU's page size, between 4KiB and 64KiB. Each page has a small data structure (about 64 bytes) called struct page, which contains various pieces of information about the page.

    If you allocate a page using the low level page allocator directly (e.g. alloc_page(), alloc_pages() and similar functions) then some of the fields in struct page are available for you to use. If you allocate it through another memory allocator, that allocator may be using the struct page for its own purposes, and so you may not use it. Consult the documentation for your memory allocator to see if it allows you to use any of it.

    The primary users of struct page are the page cache and anonymous memory and they impose various restrictions on how you can use various fields within the structure. This document explains how you can use them safely.

  • Linux 5.10 Begins Landing The Long Overdue Revamp Of printk() - Phoronix

    The Linux kernel's fundamental printk() function for printing messages at various log levels for then accessing via the likes of dmesg is beginning to see a significant overhaul.

    Coming with Linux 5.10 is now a fully lock-less ring-buffer implementation for printk. This new implementation allows for storing and reading messages without the possibility of deadlocks or relying on temporary per-CPU buffers.

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  • Raspberry Pi High Quality security camera

             

  • The Gnocchi package in Debian – Zigo's blog

    This is a follow-up from the blog post of Russel as seen here: https://etbe.coker.com.au/2020/10/13/first-try-gnocchi-statsd/. There’s a bunch of things he wrote which I unfortunately must say is inaccurate, and sometimes even completely wrong. It is my point of view that none of the reported bugs are helpful for anyone that understand Gnocchi and how to set it up. It’s however a terrible experience that Russell had, and I do understand why (and why it’s not his fault). I’m very much open on how to fix this on the packaging level, though some things aren’t IMO fixable. Here’s the details.

  • Find out more about the openSUSE + LibreOffice Conference - openSUSE News

    The openSUSE + LibreOffice Conference organizers are thrilled to begin the conference and hope everyone has a great time.

    To get attendees more accustomed to the event, we are publishing some resources and info that will help people joining this year’s conference.

  • [PCLinuxOS] KDE installation media updated 2020.1015

    PCLinuxOS installation media for KDE has been updated to 2020.1015. Features: Kernel 5.8.14, Nvidia 450.80.02, GCC 10.2.0, KDE Plasma Desktop 5.20.0, KDE Frameworks 5.75.0 and KDE Applications 20.08.2, New Global Desktop theme and Iconset. Wallpaper provided by Zoid. Installation media is available in 3 sizes. Darkstar 1.5 Gig (basic), KDE5 2.5 Gig (standard) and Magnum 3.5 Gig (large).

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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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