System & Network Admin

The Network Time Protocol (NTP) is a protocol used to synchronize Linux system clocks automatically over a network using the chrony NTP client.

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Sharing and supporting local musicwith digital public spaces

In this guide, we will show how to remove an SSL certificate and ssh private key passphrase using the openssl and ssh-keygen command line tools.

The ideal swap configuration depends on your use case and the amount of physical RAM in your host computer.

We cover using LetsEncrypt to create SSL certificates with a HAProxy load balancer.

To learn how Kubernetes works you should run your own Kubernetes cluster on bare-metal hardware. Discuss this post In the world that I live in Kubernetes is all the rage. This is the world of professional software development and deployment where medium- and large-sized companies are trying to reduce cost and complexity of their IT platforms while at the same time becoming faster at making changes to the software that they run as services to either their internal or external customers.

Find all keyboard shortcuts and tips and more about technology on DefKey.com!

Zram is a tool for creating an in-RAM compressed cache, specifically for use as swap space.

apt-offline is an offline package management tool that is used to install/upgrade software packages with their dependencies on Debian-based Linux distributions.

Scanning a QR code on an Android or an iPhone is quite easy these days. This tutorial explains how to scan QR codes that are part of an image.

SSH certificates allow system administrators to SSH into machines without having to manage authorized keys in the servers. In summary, you create a key pair to be used as a Certificate Authority (CA), and add the public key of that key pair to the server: TrustedUserCAKeys /etc/ssh/my-root-ca.pub Then, usually, a system administrator or an automated system creates certificates for the users that need to access the servers. Those certificates are created with the CA’s private key, the user’s public key, a list of principals and a validity period.

Modern and secure platform to manage a decentralized identity based on cryptographic keys

The Awesome window manager takes a "tiling" approach, meaning that each window you launch takes up a fraction of your desktop according to the number of windows you have open.

I took a pop at Mastodon several years ago, but it didn’t work. I couldn’t figure out how to make it social, and I didn’t have a good grasp of how the “federated” part…

Use these command-line switches in your terminal and shell scripts to boost your productivity

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World's simplest collection of useful browser-based list processing utilities. Reverse lists, join lists, randomize lists, change list item separator, and more.

In a for loop like this one: for f in `ls *.avi`; do echo $f; ffmpeg -i $f $f.mp3; done $f will be the complete filename, including the extension. For example, for song1.avi the output of the com...

In this tutorial, we show various methods to check if a directory exists via a Bash script or on the command line in Linux.

This tutorial will walk you through the basics of the Bash if, if..else, if..elif..else and nested if statements statements and show you how to use them in your shell scripts.

Smokeping is one great tool that can help you deal with the complexity. In this article, we’ll learn how to use Smokeping to identify and fix network

SpaceX bought satellite data start-up Swarm, in a rare acquisition by Elon Musk’s space company over a year ago. SpaceX is now advertising Swarm satellite Internet of Things connectivity on its Sta…