System & Network Admin

Power over Ethernet - or short 'PoE' - allows you to supply DC power for another device over the ethernet network cable. The most common Power Source Equipment (PSE) types are switches and routers (en

PipeWire is a powerful contender to replace PulseAudio. Here we show you how to install and configure PipeWire on your Linux system.

The main DHCP configuration file is /etc/dhcp/dhcpd.conf. The file is used to store the network configuration information required by DHCP clients.

Trust us, it’s safer this way.

In this guide, we will learn about the head command using some practical examples to work with text files efficiently from the command line interface.

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TLDR; The following command will create a new SSH key using ED25519 with an auto-generated comment. ssh-keygen -t ed25519 -f $HOME/.ssh/id_ed25519 -C "$(whoami)@$(hostname)-$(date +'%y%m%d')" SSH Keys The best, and sometimes only, way to connect to a remote SSH server is via an SSH key. Allowing key only access to a SSH server massively reduces an attackers ability to brute force the server and raises the overall level of security.

Everybody knows a DNS response needs to fit into a 512 byte UDP packet, right? But suppose it doesn't fit...

I won't go into specific cases in this blog post. This is a general guide on how to gather the necessary information that will help you to get your problem fixed. In this post, I'll use a Linux client

A simple tutorial explaining the basics of who command in Linux with its parameters, syntax, usage and various examples.

Docker has become the new standard for building your application. In a Docker image we place our source code, its dependencies, some configurations and our application is almost ready to be deployed…

Advanced-Copy is a command line program that is very much similar, but a little modified version of the original cp and mv command with a progress bar.

Distributing and replicating data among Postgres servers

Cron jobs are not sufficiently stable as a method for backup automation. In this article, we explore how best to back up data in terms of setup, frequency, data retention and general automation best practices.

Passwordless logins are a great way to secure your server. This tutorial shows you how to set up passwordless SSH logins on Linux.

Teleport is an open-source that can be used as an access plane for your global infrastructure. It provides zero-trust access to various services such ...

There a multiple use cases to run a script on login. Configuration, starting services, logging, sending a notification, and so on. I want to show you different ways to do so. Example script The examp

How to fix docker compose not updating container with locally built images (i.e. the build argument in docker-compose).

I have found recently that Firefox in Linux (Mint 17.3) is very sluggish, I do have Chrome on my system as well but I prefer Firefox for various

A backup of your Firefox profile enables you to save all your browser data (extensions, history, settings, etc.) on your local machine or any other storage.

Like most folks working in infrastructure engineering in 2014, I really enjoyed Google’s BeyondCorp whitepaper. My foremost personal interest was grounded in the fact that Uber’s contemporaneous security implementation didn’t include a VPN, so it was interesting to see a well-thought description of fostering security without over-reliance on a hardened network for employee devices. I had a second, longer-term, personal interest as well, which was never again having to argue with a coworker about why they needed to log into the VPN before accessing a secure resource.

Learn about iptables firewall, Chains, Policies, Adding, Deleting, Replacing, Saving and Listing Rules, Block ICMP Packets, Blocking Bad Flags, SYN Flooding

How to move away from RSA for SSH keys - Xe's Blog

Processor affinity is the process of allocating CPU cores to specific apps. We show you how to assign a specific CPU core to a Windows app.

Automatically-provisioned TLS certificates for Node.js servers using Let’s Encrypt.

To make it quick, I wish I had known about port forwarding and tunneling earlier. With this blog post, I try to understand it better myself and share some experiences and tips with you. Topics: use ca