System & Network Admin

OSSEC is a multiplatform, open source and free Host Intrusion Detection System (HIDS). You can tailor OSSEC for your security needs through its extensive configuration options, adding custom alert rules and writing scripts.

We have successfully created an independent, bit-by-bit-identical rebuild of the nixos-minimal ISO published by Hydra 🎉 Why is this useful? While there are a number of ‘side-benefits’, the main point of Reproducible Builds is that it gives us a reliable way to verify the binaries we ship are faithful to their sources, and have not been tampered with anywhere in the build pipeline (e.g. on Hydra). For general information on Reproducible Builds see: What exactly was reproduced? This me...

Explore how LLMs generate text, why they sometimes hallucinate information, and the ethical implications surrounding their incredible capabilities.

MicroK8s is the simplest production-grade conformant K8s. Lightweight and focused. Single command install on Linux, Windows and macOS. Made for devOps, great for edge, appliances and IoT. Full high availability Kubernetes with autonomous clusters and distributed storage.

A guide on building a simple Linux distribution from scratch. Detailed guide on building the kernel and the init process. Finally, a little distribution is built with u-root that is capable of connecting to the Internet.

Database backups are one of the biggest pain points for developers. Learn how you can keep your PostgreSQL database safe.

OpenSSH allows you to set up a per-user configuration file where you can store different SSH options for each remote machine you connect to. This article covers the basics of the SSH client configuration file and explains some of the most common configuration options.

NetBox is a hugely popular open-source IP address management (IPAM) and data centre infrastructure management (DCIM) tool. NetBox provides a range of automation features, one of which is the ability to update NetBox with Ansible using the Ansible NetBox collection. In this short post, we'll walk through the process of

Make your first steps in Kubernetes with Minikube on Linux. Follow our guide for a seamless one-node cluster setup experience.

Relying on manual checks for proper infrastructure allocation and utilization adds to the burden of wasted resources and expenses for companies large and small.

When it comes to Kubernetes, operational telemetry data is critical for SREs to maintain SLOs.

Cert-Manager automates the provisioning of certificates within Kubernetes clusters.

If you work at a hosting provider or CDN, ACME’s DNS-01 validation method can make it a lot easier to onboard new customers who have an existing HTTPS website at another provider. Before your new customer points their domain name at your servers, you need to have a certificate already installed for them. Otherwise visitors to the customer’s site will see an outage for a few minutes while you issue and install a certificate.

Learn how, when and why to use Let's Encrypt on AWS - and when give up use Amazon ACM-generated certificates instead to remain sane.

A symbolic link, also known as a symlink or soft link, is a special type of file that points to another file or directory. In this guide, we will cover how to use the ln command to create symbolic links.

Linux is, without a doubt, one of the single most flexible operating system platforms on the planet. With the flagship open source ecosystem, there is almost nothing you cannot do. What makes Linux so flexible? The answer to that question will depend on your needs. Suffice it to say, the list of answers is significant …

Can we make working at the command line a little less cumbersome?