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today's howtos

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  • How to convert CentOS 8 to CentOS 8 Stream

    If you've been paying attention, you know all about what's been going down with CentOS. Because of that, you're probably concerned about all those CentOS servers you have on your network. Since those servers probably power a number of services to your backend, that concern is legitimate.

  • An Introduction to Radio Direction Finding

    Humans do audio direction finding to a remarkable precision of less than two degrees. Shortly after the development of radio transmitters and receivers, radio direction finding (RDF) evolved for much the same reasons as human audio direction finding, for the location of possible threats and for spatial awareness.

    Radio Frequency (RF) direction finding is used in several applications such as military, for finding the direction of a threat, the location and movement of enemy transmitters and the direction of enemy jammers. Search and rescue, to find the location of RF search and rescue beacons. Science, to track animals in their environment and radio monitoring, to find the location of sources of interference and of illicit transmitters.

  • SOGo calendar synchronization breaks due to emoji in the event title

    I am using the SOGo Groupware. I noticed certain emojis in the event title would prevent calendar apps from synchronizing using the CalDAV protocol. I checked the logs but could not find much. I had my doubts about what could be causing it. Then, this bug report confirmed that I should investigate on the UTF-8 encoding support.

  • How To Flush DNS Cache on Linux – devconnected

    DNS, short for the Domain Name System protocol, is used on Linux systems in order to retrieve IP addresses associated with names.

    For example, when you are performing a ping request, it is quite likely that you are using the DNS protocol to retrieve the server IP.

    In most cases, the DNS requests that you perform are stored in a local cache on your operating system.

    However, in some cases, you may want to flush the DNS cache of your server.

    It might be because you changed the IP of a server on your network and you want to changes to be reflected immediately.

    In this tutorial, you are going to learn how you can easily flush the DNS cache on Linux, whether you are using systemd or dnsmasq.

  • How to install FluxBox Desktop Ubuntu 20.04 LTS Server or PC

    Fluxbox desktop is an extremely lightweight stack-based X windows manager for Linux systems such as Ubuntu, Debian, Arch, and others… If you have a command-line interface Ubuntu 20.04 / 18.04 LTS or Debian server and want to install Fluxbox on it then here is the tutorial.

    Although if you have a command-line interface server then you already familiar with commands, however, if you want to use browser and other graphical user interface programs on it but without stretching your system resources much then Fluxbox is a good option to consider. Of course, it will not be an eye-catching graphical desktop instead of a very minimal graphical interface provider.

More in Tux Machines

Emmabuntüs Debian Edition 3 1.04 Released with Debian GNU/Linux 10.8 “Buster” Updates

About four month in development, Emmabuntüs Linux Debian Edition 3 1.04 comes packed with all the updates from the Debian GNU/Linux 10 “Buster” operating system series, more specifically it’s based on the Debian GNU/Linux 10.8 update released last month with 45 security updates and 56 other updated packages with bug fixes. This means the educational distro is now up to date and safe to use by anyone on their personal computers. Offering up-to-date systems, especially for educational use, is very important and Emmabuntüs Debian Edition does a good job at keeping its users updated at all times. Read more

Android Leftovers

Compact Arm Linux gateway features ThingsBoard IoT software

Neousys’ rugged “IGT-22-DEV” IoT gateway runs the open source Linux “ThingsBoard IoT” stack on a TI AM3352 with PoE PD, DIO, serial, USB, and mini-PCIe with uSIM. After years of playing a dominant role on the pages of LinuxGizmos, the Cortex-A8-based TI Sitara AM335x has faded in recent years in favor of IoT-oriented Cortex-A7 processors such as the i.MX6 UL. Over the last week, however, the Sitara AM3352 has appeared twice: first in Aaeon’s SRG-3352C IoT gateway and now in Neousys’ IGT-22-DEV. Whereas the SRG-3352C showcases NB-IoT, the DIN-rail mountable IGT-22-DEV’s most notable feature is its pre-installed Linux IoT stack based on ThingsBoard IoT Gateway software. Read more

Best Screen Capture Tools for Linux in 2021

Screenshots come in handy when you want to capture part of or the entire screen usually for elaborative purposes. Screenshots are useful when putting together “How to” tutorials in showing crucial steps that would be better understood using images. Also, you could send a screenshot to a friend or your family to show evidence of a purchase receipt, or guide them in undertaking a task on their PC. To capture the entire desktop, simply press the PrtScr button. Captured images are saved in the ‘Pictures’ folder. Another easy way of capturing screenshots is using the SHIFT + PrtScr keyboard combination. This reveals a crosshair pointer that you can drag to grab the area that you wish to capture. Read more