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today's howtos

Submitted by Roy Schestowitz on Sunday 11th of April 2021 03:32:31 PM Filed under
HowTos
  • A Ceph war story

    It all started with the big bang! We nearly lost 33 of 36 disks on a Proxmox/Ceph Cluster; this is the story of how we recovered them.

    At the end of 2020, we eventually had a long outstanding maintenance window for taking care of system upgrades at a customer. During this maintenance window, which involved reboots of server systems, the involved Ceph cluster unexpectedly went into a critical state. What was planned to be a few hours of checklist work in the early evening turned out to be an emergency case; let’s call it a nightmare (not only because it included a big part of the night). Since we have learned a few things from our post mortem and RCA, it’s worth sharing those with others. But first things first, let’s step back and clarify what we had to deal with.

  • [Old] Create animated GIFs from MP4 with FFmpeg

    Animated GIFs are after all these years still pretty popular. FFmpeg is a good FLOSS tool to create these animated GIFs. FFmpeg is available for Windows, Linux and OSX. A word of warning FFmpeg is a command line tool that’s very versatile but it’s not for everybody. In fact suppose this post is more for users that like to tinker a lot with their animated GIFs. Below I will explain not only how to create a animated GIF from an mpeg4 movie but I also provide instructions to improve the quality.

    The basic command to create an animated GIF from a mpeg4 is:

    ffmpeg -i input.mp4 output.gif

  • [Old] How to make GIFs with FFMPEG

    In that light, I wrote this post to share and explain some of its functionality, especially as it relates to GIF transcoding. To follow along you’ll need FFmpeg installed. The easiest way to do that is to go here and find a static build for whatever platform you’re working on.

  • How To Install 7Zip on Ubuntu 20.04 LTS

    In this tutorial, we will show you how to install 7Zip on Ubuntu 20.04 LTS. For those of you who didn’t know, The 7Zip is open-source software available to compress and decompress files and folders into various formats. A 7Zip archive file usually ends in .7z extension.

    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 through the step-by-step installation of the 7-Zip File Archiver on Ubuntu 20.04 (Focal Fossa). You can follow the same instructions for Ubuntu 18.04, 16.04, and any other Debian-based distribution like Linux Mint.

  • Getting Started With System Logging in Linux

    System logs in Linux provide you with great insight into core activities on your PC or server infrastructure. They're critical for keeping your system stable and secure. System logs also provide you with an opportunity to audit various activities that have taken place in the past.

    This guide introduces you to the logging system in Linux. All the major activities carried out by core system applications and services are recorded in the form of logs and at the heart of all this is a system known as Syslog.

  • How to edit config files on Ubuntu | FOSS Linux

    The information needed to monitor the execution of a program is stored in configuration files. To maintain an Ubuntu server or desktop or any other Linux system, Linux users, especially Linux administrators, must edit configuration files.

    In fact, every Linux administrator must manually edit a configuration file at some stage. You can’t resist diving deep into the heart of one or more configuration files while setting up a web server, configuring a service to link to a database, modifying a bash script, or troubleshooting a network connection. Manually editing configuration files might seem like a nightmare to some people.

    Wading through what seems to be endless lines of choices and feedback can lead to a rapid loss of hair and sanity.

    Of course, this isn’t the case. Most Linux administrators, in reality, relish a good debugging or configuration challenge. It’s a lot of fun to sift through the details of how a server or piece of software works. This method, however, does not have to be a waste of time and resources. In reality, you have resources at your disposal that make editing config files a lot easier.

  • How to make a bootable Windows USB drive on Linux using Woeusb-ng?

    As a Linux user, you may need to make a bootable Windows USB drive for testing and education purposes or even to install it alongside your favourite distro. Whatever your reasons, you will be able to create a Microsoft OS bootable flash drive after reading this humble post. So power on your system and plug in your USB flash drive as you are only a few lines away from acquire this skill.

  • How To Install Emacs Editor on CentOS 8 - idroot

    In this tutorial, we will show you how to install Emacs Editor on CentOS 8. For those of you who didn’t know, Emacs is a very useful plus feature-rich text editor that may be used across multiple various platforms. Because of its considerable support for writing code within different languages, it is favored by most programmers. If you’re thinking about switching to Emacs on your Linux, or you’ve just switched to it, you will find that Emacs is not that hard to use.

    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 through the step-by-step installation of the Emacs Editor on a CentOS 8.

  • Self host your web meetings with Jitsi and Raspberry PI - peppe8o

    Even if already used with smartphones, video meetings overwhelmingly raised with Covid pandemic. Between solutions discovered in this context, a great open source and web application to host your video meetings, Jitsi, can run on Raspberry PI

  • Shell Script - Remove Double Quote ("") from a String – TecAdmin

    This tutorial will help you to remove start and ending double quote from string in shell script. Where the string is stored in a variable.

    [...]

    The result will be printed on the terminal. You can also save the result to variable and or redirect output to a file.

    The below commands will help you to remove double quote and store output to the same or different variable.

  • GNU Linux Debian 10 – dead boot partition stuck at grub prompt
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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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