Tag Archives: Linux

FreeBSD: Home NAS, part 8 – NFS and Samba data backups using restic
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5 January 2026

Actually, almost everything regarding my home NAS setup has been done – there is VPN access from various networks, different shares are available, and the security has been slightly tuned. Two main things remain: monitoring and backups. Having a ZFS mirror on two disks with regular ZFS snapshots is, of course, great, but it is… Read More »

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TCP/IP: SYN flood attack on the RTFM server, and “Hacker News hug of death”
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2 January 2026

Got an alert from the monitoring system this morning, indicating that the blog is down: Well, I thought: another one DDoS, not the first time. Investigating the issue I went to the Cloudflare admin, enabled the Under Attack Mode, and started the investigation. Checked the requests: I think, okay, it’s simple – requests are coming… Read More »

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Arch Linux: pacman -Syu and “Failed to connect to system scope bus via local transport” errors
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29 December 2025

Problems with upgrades on Arch Linux are very rare, and a situation like today’s is a first for me in nearly 10 years of using the system. So, what happened: installed upgrades with pacman -Syu after installation, sudo reboot would hang managed to reboot only with sudo reboot -f (force) after the reboot – X.Org… Read More »

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FreeBSD: Home NAS, part 6 – Samba server and client connections
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28 December 2025

Continuing the setup of my home NAS on FreeBSD. Actually, a NAS is a Network System, and it’s desirable to have access to it from other devices – Linux and Windows hosts, phones, and TVs. Here we have two main options – Samba and NFS. One could also mention sshfs – but this solution is… Read More »

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Kubernetes: Pod resources.requests, resources.limits, and Linux cgroups
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20 July 2025

How exactly do resources.requests and resources.limits in a Kubernetes manifest works “under the hood”, and how exactly will Linux allocate and limit resources for containers? So, in Kubernetes for Pods, we can set two main parameters for CPU and Memory – the spec.containers.resources.requests and spec.containers.resources.limits fields: resources.requests: affects how and where a Pod will be… Read More »

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TCP/IP: OSI and TCP/IP models, TCP packets, Linux sockets and ports
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19 July 2025

It’s difficult to describe in one post what thousands of books have been written about in a thousand pages, but today we’ll try to quickly review the basics of how hosts communicate on a network. First, let’s talk about the OSI and TCP/IP models, then about packet structure and connection establishment, and finally, we’ll look… Read More »

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Arch Linux: linux-firmware-nvidia: /usr/lib/firmware/nvidia/ exists in filesystem
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9 July 2025

Even though the changes were announced in emails from Arch Linux, for some reason, many people have had problems with the latest update: in the Arch Linux subreddits on Reddit, people are complaining like “Everything is broken, what should I do now?” Let’s see how to complete the upgrade and what exactly has changed. The… Read More »

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