In a previous post, I explained how to use the Ubuntu Server Netboot Tarball to install the OS via PXE. However, it still requires the sysadmin to have access to the physical machine. This is not scable. By using an Ubuntu autoinstall configuration file, it is possible to automate the entire installation process completely. In this post, I first explain how Ubuntu autoinstall works, and then how have I set it up for my use.| Technical Scratchpad
Learn how ZFS handles dataset management with snapshots, clones, and bookmarks—tools that enable reliable backups, efficient replication, and flexible testing without data risk.| Klara Systems
Windows 10 reached end of support on October 14, 2025. If the PC meets the minimum requirements for Windows 11, Windows Update should offer upgrading to Windows 11 automatically. And when the upgra…| Majornetwork
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... Read more The post Rayhunter Tutorial: Convert a Verizon Orbic Speed RC400L into a Stingray Detector appeared first on LinuxConfig.| LinuxConfig
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ZFS is more than just reliable—it can be fast. This article breaks down how to optimize ZFS for high-throughput storage workloads using ARC, prefetch, metadata vdevs, DirectIO, and tuning parameters to unlock real performance gains. The post Optimizing ZFS for High-Throughput Storage Workloads appeared first on Klara Systems.| Klara Systems
I have made occasional contributions to the Wireshark project for over five years now. I started with small documentation updates, and later I have added two new protocol dissectors (Zabbix and Z21…| Majornetwork
... Read more The post How to Find Nginx Cache File Location on Linux appeared first on LinuxConfig.| LinuxConfig
For better or worse, one of the desktops in my homelab needed a new installation of the OS but could not read the bootable USB containing Ubuntu Server 24.04. I decided to take this opportunity to get some experience to install Ubuntu Server with using the netboot tarball image instead. This post documents the steps of how I managed to do it.| Technical Scratchpad
Why you shouldn’t rely on AI or LLMs to tune ZFS—real-world tests reveal outdated, misleading, and potentially harmful configuration advice.| Klara Systems
Learn how FreeBSD Netgraph supports modular, kernel-level networking for VPNs, firewalls, and real-time packet routing.| Klara Systems
When using the built-in SSO (Single Sign-On) in NetBox with Entra ID, the Active Directory (AD) group or role information for the users is not available out of the box. Based on the discussions in NetBox repo I tested and wrote down a short memo of getting the users’ groups usable in NetBox. In this […]| Majornetwork
These notes have been tested with Proxmox Virtual Environment (PVE) 8.2.4, Debian 12 and cloud-init 22.4.2 (from Debian 12 packaging). First create a virtual machine and install Debian Linux on it normally, with all the additional tools and updates as required. I usually use the netinstall CD image from Debian. After completing the installation, for […]| Majornetwork
I often need a Linux virtual machine for testing specific things. Debian Linux is my choice of Linux distribution, and I have wondered how much space does each installed package take in it, to possibly optimize the size of the VM if needed. I installed two VMs: The results after “sudo apt clean“: Installation Disk […]| Majornetwork
Uncover the secrets of ZFS space accounting and why available storage can appear lower than expected—see what impacts space calculation.| Klara Systems
The Grandstream GXP2020EXT is an accessory “sidecar” (or in Grandstream-speak “Expansion Module”) that adds 56 speed dials with BLF to Grandstream model GXP20xx VoIP telephones. In the article below I’ve provided two scripts to help GXP2020EXT users keep their units programed with fresh directory information and matching card inserts. The Problem As the phone system […]|
An email with a trojan Microsoft Word document made it past the spam filter today at work. At least one user reported opening the attachment. The attachment was named: DOCO943488.doc, but running the file through virustotal.com it was clear that it’s been known by other names.. To help affected people find this page here are […]|
You connect into the server and type “w” to see who else is on. You see a connection from an IP you don’t recognize! 14:43:11 up 5 days, 22:32, 2 users, load average: 0.52, 0.41, 0.36 USER TTY FROM LOGIN@ IDLE JCPU […]|
New Sysadmin? Learn how to log into a live server using SSH (Secure Shell) so you can examine logs, modify configuration files, diagnose performance problems, update software, and lots more.| SpinupWP
AFNIC (French Association for Cooperative Internet Naming) operates the country code top-level domain “.fr” (over 4 million registered domain names) as well as several other TLD of overseas departments and territories, and a dozen of generic TLD. As the “.fr” registry manager, Afnic has been ISO 27001 certified since 2016 and designated as an Essential […]| Rudder
An investigation of a noisy service alert leads to a mystery of who is to blame: netdata, nginx or PHP?| Thomas Pike’s other blog
