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today's howtos

Submitted by Roy Schestowitz on Friday 10th of December 2021 04:45:43 PM Filed under
HowTos
  • 2021-12-05 singing wires

    I have probably described before the concept of the telephone network forming a single, continuous pair of wires from your telephone to the telephone of the person you are calling. This is the origin of "circuit switching" and the source of the term: the notion that a circuit-switched system literally forms an electrical circuit between two endpoints.

  • NVMe drives and the case of opaque bandwidth limits

    However, I'm not sure I see an obvious place with the bandwidth limit in my PCIe topology, at least with Linux's tools for PCIe topology. Both NVMe drives are connected to 'Intel Corporation 200 Series PCH PCI Express Root Port' PCIe devices that are listed as part of what I think of as the PCI root bus. Since this is an Intel thing, PCH probably stands for Intel's Platform Controller Hub, which has a DMI link between the Intel CPU and the Z370 chipset. Looking at various things, this DMI link is about the speed of PCIe 3.0 x4, which could explain how I'm running into bandwidth limits. If neither NVMe drive is directly connected to any CPU PCIe lanes, the combined bandwidth of both of them together would be limited by the PCH to CPU bandwidth of roughly PCIe 3.0 x4.

  • DNS "propagation" is actually caches expiring

    First – I’m very tired of posts that complain about how people are “wrong” about how a given piece of technology works without explaining why it’s helpful to be “right”. So here’s why I like knowing how DNS works.

  • My Backup Plan

    Over the past year, since I got more serious about my growing YouTube channel's success, I decided to document and automate as much of my backups as possible, following a 3-2-1 backup plan: [...]

  • [Updated] 8 Linux Nslookup Commands to Troubleshoot DNS Lookup

    nslookup is a command-line administrative tool for testing and troubleshooting DNS servers (Domain Name Server). It is used to query specific DNS resource records (RR) as well. Most operating systems come with a built-in nslookup feature.

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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.

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  • 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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