Blog on SETE

PV Expansion 1

Mon, 06 Apr 2026 00:00:00 +0000

Disclaimer: I currently work at Fronius. No components have been provided by the company Fronius. All components were paid for by myself. I receive no compensation for writing about this conversion. Please do not understand this as advertising, but as a pure experience report. This is not a guide or advice. Technical regulations can change depending on the prerequisites.

Linux Mint Unattended Installation

Mon, 22 Dec 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-12-22.

An Article about Rubenshof - Linux Mint Unattended Installer

Every year we set up some devices for our students at school. This year we had the situation of delayed deliveries, because a donation of notebooks took longer than expected. So we have to get faster with setting the devices up. I took this challenge and created a unattended Workstation setup for our school.

Cloud-Init What?

Sun, 23 Nov 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-11-23.

It’s common for IT Administrators managing classical enterprise Virtual Machine (VM) infrastructure to overlook powerful, existing tools for automation and scale-out. While the benefits of cloud-native deployment patterns—like disposable, self-configuring infrastructure—are well-understood, many don’t realize that similar, workflow-based efficiency is achievable for their on-premises VMs. The necessary technology has been available for years.

0 Vulnerabilities - Think twice about it

Wed, 22 Oct 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-10-22.

Vulnerability scans can be tricky and there are different strategies. It starts already at the datasets provided by the different OS and how they are implemented from the scan tools. For example Alpine. A lot Engineers think it is secure because 0 vulnerabilities shown at scans with tools like trivy.

Opennebula evaluation for Homelab

Sat, 18 Oct 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-10-18.

Since I didn’t use Opennebula for a while but had good experience with it at the past, I decided to check what is new within this project. Therefore I instantiated a miniONE instance in the proxmox Homelab.

Enterprise Cloud Alternatives - are not newly invented

Thu, 16 Oct 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-10-16.

In the technology world, a familiar pattern has become increasingly disruptive. We’ve all seen the recent headlines and read the industry articles detailing the licensing chaos and sudden cost increases that follow when major tech companies acquire key industry players. The message is clear: when proprietary giants consolidate power, the terms of engagement often shift dramatically, leaving countless businesses vulnerable.

IT Lab for Village School

Sat, 28 Jun 2025 00:00:00 +0000

A small village school needs an IT infrastructure, and the setup should be done with the school’s youth. It should be fun and relaxed. Anyone who wants to participate can and may be involved. Digital independence starts with the selection of software and components. In our case, we received hardware from a former Austrian startup.

Monitoring a TV Headend

Wed, 22 Jan 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-01-22.

In my experience working with cloud environments, I’ve extensively used Prometheus, Grafana, and Alertmanager for monitoring. However, when dealing with TV Headends, I’ve encountered a common challenge: the lack of Prometheus endpoints for directly scraping metrics.

Virtualized School IT Lab

Sun, 19 Jan 2025 00:00:00 +0000

Originally published on LinkedIn on 2025-01-19.

This Lab environment was created for a showcase at a local school. The school, a small community-driven institution based on Montessori principles, serves approximately 70 children and teachers. Open Source and Free and Open-Source Software (FOSS) are valued by some of the teaching staff, and they requested assistance with certain aspects of the school’s infrastructure. Considering this preference, a cloud solution was deemed unsuitable.

PV System

Fri, 02 Aug 2024 00:00:00 +0000

Goals
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The installation of a PV system to cover the energy needs for hot water preparation. Island operation is not intended.

vault snap to S3 in kubernetes

Wed, 24 May 2023 00:00:00 +0000

Originally published on LinkedIn on 2023-05-24.

Hashicorp Vault
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In vault-enterprise there would be an integrated solution to upload backups to S3 compatible storages. In the Open Source version of Vault this feature is missing, so I had to create some solution for this.

GitOPS with ArgoCD

Fri, 12 May 2023 00:00:00 +0000

Originally published on LinkedIn on 2023-05-12.

Intro
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In 2007, when I started to work in tech, IT administrators relied often on shell scripts to automate their workflows. Virtualisation was not that popular and tools like PXE boot and bootstrap files where used to automate the installation of operating systems on multiple servers simultaneously. The network layer was very often operated without automation at all. Later, KVM was also gaining popularity, enabling administrators to create and manage virtual machines. As infrastructure became more complex, configuration management tools like Chef and Ansible became popular, allowing administrators to define infrastructure as code and apply configuration changes across multiple servers quickly and easily.

Environmental protection instead of flying

Sun, 19 Jun 2022 00:00:00 +0000

Originally published on LinkedIn on 2022-06-19.

This is our contribution to the environment. On the left you can see a planted hedge, in the middle hay that we only mowed in mid-June. On the right, a strip of meadow that has been left standing, a compost heap, a vegetable field…

What are Terraform remote states?

Mon, 14 Feb 2022 00:00:00 +0000

Originally published on LinkedIn on 2022-02-14.

These days I learn to build a infrastructure in GCP. The past years I already worked with terraform and so I had already some experience with it. But I didn’t use terraform_remote_state as data source in the past.

The circle and lifelong learning

Mon, 03 Jan 2022 00:00:00 +0000

Originally published on LinkedIn on 2022-01-03.

Why I took this set of pictures in the title?

The last 20 years I had several jobs and learned a lot in different professions. So I got experiences as farmer, arborist, electrician, CTV technician, Infrastructure engineer and in geospatial projects. I never thought that I will have a chance to combine most of those experiences in a single job.

Service Ownership

Tue, 10 Aug 2021 00:00:00 +0000

Originally published on LinkedIn on 2021-08-10.

Over the last years I had the pleasure to take care at serveral internal IT tools as an engineer beside production IT. At the beginning it was just about set up a servers, give people access and keep it running (somehow). I often had to focus at multiple things at once. And it was okay. But years later, the company grew. Someone had to take ownership on tools which are used by everyone inside the company. I got asked to do this for a dedicated tool in internal IT and want to share my experiences a bit.

From Atlassian Server to Data Center

Thu, 29 Jul 2021 00:00:00 +0000

The last Year I learned a lot about Atlassian Products, because I could focus on the Technology and I had the goal to improve the experience for our users. But let me start from the beginning of my Atlassian jounrey.

We plant, so we are!

Thu, 02 Jul 2020 00:00:00 +0000

Originally published on LinkedIn on 2020-07-02.

Over the last years I learned why it is important to grow your own food. It’s much more than eat something, it’s kind of lifestyle and also my part against climate change. But why? In my case I focus on regenerative agriculture. Thats even more than a sustainable agriculture does. One of my goals is to give back more than I take from the soil. That’s nice, isn’t it? But I can tell you it is really difficult. It is really hard to increase the amount of humus in soil when you try to harvest at the same time.

Use Build pipelines

Wed, 27 May 2020 00:00:00 +0000

Originally published on LinkedIn on 2020-05-27.

These days I was on vacation, and I’m preparing for my new job which I will start soon. A friend of mine asked for a bit of help with their mapserver RPM packages, because they needed a special combination of mapserver7.4.4 , php7.4, postgresql12 on CentOS7 and CentOS8.

Use the power of automation

Fri, 01 May 2020 00:00:00 +0000

Originally published on LinkedIn on 2020-05-01.

I really like to automate things. So I also automate the creation and provision of base images for a datacenter environment.

There are some tools which solve this. In my case I prefer packer.io.

Get Fibre Channel HBA adapter metrics

Mon, 30 Mar 2020 00:00:00 +0000

Originally published on LinkedIn on 2020-03-30.

Since I deal with Fibre Channel, I have to deal with new tools as well. Today for example we had some issues on a Linux Server with Fibre Channel HBA setup. In fiber optic network you are looking for Rx/Tx power metrics, which I also get from the SAN switches. But to detect issues it’s good to see the RX/TX power also from the host side. The Linux support inside the company told me, that they can’t find metrics inside the system. So I tried to get some more knowledge about that topic.

Powershell + Gitlab

Sun, 19 Jan 2020 00:00:00 +0000

Originally published on LinkedIn on 2020-01-19.

In my last article I wrote about Powershell DevOps pipeline and that I would like to use gitlab-ce for that project. So today I combined some things that I’m interessted in, at my homelab. Lets spawn gitlab-ce with podman in a Centos 8.1 VM.

Powershell for me as PSDummy

Mon, 06 Jan 2020 00:00:00 +0000

Originally published on LinkedIn on 2020-01-06.

Hi together, as some of you know I took a new challenge last year and now I work for a big Healthcare Company in the IT department. Over the last years I got a lot of experience how to use automation tools in a homogeneous Linux infrastructure. In my new job things are different.

Get slow to be more efficient

Tue, 24 Sep 2019 00:00:00 +0000

Originally published on LinkedIn on 2019-09-24.

I never met my great grandfather, but I had this picture from him. And from time to time I wonderd how it would be to till a field like in the old days.