Blog

Posts of a blog, about technical, personal and random things.

Oct 13, 2025

Kubernetes: IPv6-only For Real In Good This Time

Let's set up a Kubernetes cluster that runs using IPv6-only networking, using the /64 networks of your machines, with Talos Linux and Cilium CNI.

Alexander Trost

Oct 1, 2024

Docker for Devs - Workshop

"Docker for Devs"-Workshop for getting started with Docker and containers.

Alexander Trost (Senior Trainer Containertechnologien, PCS Pleger Consulting & Services GmbH)

Aug 29, 2023

Company politics are hobbling your distributed data performance

Data storage isn’t everyone’s responsibility, but it is everyone’s problem. These are some reflections on where storage performance goes wrong.

Alexander Trost

Jul 24, 2023

It's Slow and I Don't Know Why

We've been there. Here are some debugging tools and tips for getting to the bottom of storage performance issues.

Alexander Trost

May 10, 2023

Multus is the way to go for Rook Ceph networking

Let's talk about Multus and why you should use it

Alexander Trost

Sep 27, 2022

Better Insights: Extended Ceph Exporter for your Ceph Clusters

We are happy to announce that our `extended-ceph-exporter` project is hereby publicly available.

Apr 21, 2022

Choosing the right Storage: Part 2 Common Storage Types

Second part of our "Choosing the right Storage" series. Let's dive into the 3 most common storage types.

Alexander Trost

Apr 11, 2022

Choosing the right Storage: Part 1 Application Storage

First part of our "Choosing the right Storage" series. Let's dive into the data a web application needs to store.

Alexander Trost

Mar 25, 2022

Taking Control

Talking about time, control, Hedgehog's dilemma and other personal points.

Alexander Trost

Jan 31, 2020

FOSDEM'20 Brussels

Some thoughts, notes, comments and pictures from the FOSDEM'20 in Brussels, Belgium.

Alexander Trost

Jan 10, 2020

My Home Office Setup v2

In this post I'm showing you my current gaming and home office setup.

Alexander Trost

Jan 6, 2020

Rook: New Winds in the v1.1 release

Cross post of an older post I published on The Cloud Report blog about the Rook v1.1 release.

Alexander Trost

Jan 6, 2020

Running ownCloud in Kubernetes with Rook Ceph Storage - Part 2

How to run ownCloud in Kubernetes with using Rook for a Ceph Cluster.

Alexander Trost

Jan 6, 2020

Running ownCloud in Kubernetes with Rook Ceph Storage - Part 1

How to run ownCloud in Kubernetes with using Rook for a Ceph Cluster.

Alexander Trost

Oct 12, 2019

Ancientt - Automation for Network Testing Tools

Let's see what Ancientt is and how Ancientt can help by automating certain network testing tools.

Alexander Trost

Sep 25, 2019

Sitrep Container and IPv6 Presentation

My 'Sitrep Container and IPv6' slides which I held at an IPv6 meetup.

Alexander Trost

Jun 28, 2019

Importance of IPv6 in a Cloudy World Presentation

My 'Importance of IPv6 in a Cloudy World Presentation' slides which I held at the ContainerDays Hamburg 2019.

Alexander Trost

Jun 28, 2019

Matrix Synapse SAML2 Login

Tutorial on how to use Keycloak with Matrix Synapse Homeserver for authentication of users.

Alexander Trost

Jun 10, 2019

GitLab + Kubernetes: Using GitLab CI's Kubernetes Cluster feature - UPDATED

This post shows possibilites on how to use GitLab in combination with Kubernetes to contionously deliver your applications with Container, using the new GitLab CI Kubernetes Cluster feature.

Alexander Trost

Mar 26, 2019

Container and Kubernetes Training

Container und Kubernetes Training Material

Alexander Trost

Mar 26, 2019

Container and Kubernetes - Day #3

Container und Kubernetes Training Material

Alexander Trost

Mar 26, 2019

Container and Kubernetes - Day #2

Container und Kubernetes Training Material

Alexander Trost

Mar 26, 2019

Container and Kubernetes - Day #1

Container und Kubernetes Training Material

Alexander Trost

Feb 23, 2019

FOSDEM'19 Brussels

Some thoughts, notes, comments and pictures from the FOSDEM'19 in Brussels, Belgium.

Alexander Trost

Feb 18, 2019

My Sysctl Parameters

These are the sysctl settings I deploy on most of my machines.

Jan 7, 2019

Rook more than Ceph

Cross-Post of my "Rook more than Ceph" article from "The Cloud Report"

Alexander Trost

Nov 12, 2018

Ceph Day Berlin 2018

Talks, thoughts and pictures from the Ceph Day Berlin 2018.

Alexander Trost

Oct 15, 2018

What exactly is „Cloud Native" even?

Cross-Post of my "What exactly is „Cloud Native" even?" article from "The Cloud Report"

Alexander Trost

Jul 10, 2018

Distributed Storage with Rook Presentation

A presentation about "Distributed Storage with Rook" which was held at Container Days Hamburg.

Alexander Trost

Jun 19, 2018

Container Days 2018 Hamburg

Some thoughts, notes, comments and pictures from the Container Days 2018 in Hamburg.

Alexander Trost

Jun 17, 2018

GitLab + Kubernetes: Using GitLab CI's Kubernetes Cluster feature

This post shows possibilites on how to use GitLab in combination with Kubernetes to contionously deliver your applications with Container, using the new GitLab CI Kubernetes Cluster feature.

Alexander Trost

Jun 7, 2018

k8s-vagrant-multi-node: The magic behind this project

In this post I'm going to write about a project I started to speed up multi-node Kubernetes dev environments. I'm going to especially explain how to simple it can be to start VirtualBox VMs in parallel.

Alexander Trost

Jun 5, 2018

My New Home Office Setup

In this post I'm showing you my new gaming and home office setup.

Alexander Trost

May 4, 2018

KubeCon Copenhagen 2018 - Day 3

Talks, keynotes, thoughts and pictures from the KubeCon Copenhagen 2018 Day 3.

Alexander Trost

May 3, 2018

KubeCon Copenhagen 2018 - Day 2

Talks, keynotes, thoughts and pictures from the KubeCon Copenhagen 2018 Day 2.

Alexander Trost

May 1, 2018

KubeCon Copenhagen 2018 - Day 1

Talks, keynotes, thoughts and pictures from the KubeCon Copenhagen 2018 Day 1.

Alexander Trost

Apr 4, 2018

KubeCon Austin 2017 (Recap) Presentation

A recap presentation about the KubeCon Austin 2017.

Alexander Trost

Mar 6, 2018

CRI-O + Container Linux: How to Install

This post is containing steps on how you can install CRI-O on Container Linux.

Alexander Trost

Feb 7, 2018

Ceph Day Darmstadt 2018

Talks, thoughts and pictures from the Ceph Day Darmstadt 2018.

Alexander Trost

Jan 16, 2018

GitLab: Use Keycloak as SAML 2.0 OmniAuth Provider

How to use Keycloak SAML 2.0 for GitLab as an OmniAuth provider.

Alexander Trost

Dec 5, 2017

KubeCon 2017 Austin

Talks, keynotes, thoughts and pictures from the KubeCon Texas, Austin 2017. Be aware that this post contains many photos! Check you wifi before opening.

Alexander Trost

Nov 5, 2017

Writing your first Golang Microthingy Presentation

A presentation about writing a Microservice in Golang. Talks about the basics, why Microservices? Why Golang?

Alexander Trost

Nov 4, 2017

GitLab + Kubernetes: GitLab on top of Kubernetes

How to run GitLab on top of a Kubernetes cluster with persitent storage.

Alexander Trost

Aug 31, 2017

Container Linux: Deploy on Bare-Metal without DHCP server

This is more of a quick writeup in form of a note on how to deploy Container Linux on bare-metal without DHCP server.

Alexander Trost

Aug 31, 2017

GitLab + Kubernetes: Running CI Runners in Kubernetes

How to run GitLab CI Runners in Kubernetes using the GitLab CI Runner's Kubernetes executor.

Alexander Trost

Aug 5, 2017

Ceph: rbd bench Commands

Commands for running rbd bench(marks).

Alexander Trost

Jul 31, 2017

Kubernetes - WYNTK - GitLab CI + Kubernetes Presentation

A presentation about "What You Need To Know" about using GitLab CI with Kubernetes for Continous Delivery as a quick overview.

Alexander Trost

Jul 4, 2017

GitLab + Kubernetes: Perfect Match for Continuous Delivery with Container

This post shows possibilites on how to use GitLab in combination with Kubernetes to contionously deliver your applications with Container.

Alexander Trost

Jul 1, 2017

Container Linux: Specification YAML

The Container Linux config specification as a YAML template.

Alexander Trost

Jun 29, 2017

Google Cloud: Enterprise Grade Hybrid Cloud with Kubernetes Cluster Federation

These are my thoughts and notes about the presentation and overall the Google Cloud Kubernetes Federation event itself.

Alexander Trost

Jun 20, 2017

Container Days 2017 Hamburg

Some thoughts, notes, comments and pictures from the Container Days 2017 in Hamburg.

Alexander Trost

Jun 2, 2017

Golang: go get from GitLab

I just now came across the problem that I created a repository on a private GitLab instance for a Golang project and could not just use go get ... to get it. After a short Google search, I came across this StackOverflow question and thankfully it had a working answer.

Alexander Trost

May 30, 2017

Kubernetes Elasticsearch Operator

Installation and examples for using my elasticsearch operator (GitHub galexrt/elasticsearch-operator).

Alexander Trost

Apr 27, 2017

(Old) Docker Presentation

An older presentation of I made for my training.

Alexander Trost

Jan 27, 2017

Kubernetes v3 Presentation

The latest version of my Kubernetes presentation. Containing some of the new Kubernetes features.

Alexander Trost

Sep 16, 2016

My Blog Layout has been updated

The design of my blog has been updated with Google Custom Search Engine and some other fixes.

Alexander Trost

Sep 14, 2016

iptables: Using statistic module

This post will show some examples using the iptables statistic module random mode.

Sep 14, 2016

Zulip: Installation

A tutorial that guides you through installing Zulip.

Sep 13, 2016

Kubernetes Interactive Bootcamp

The link to the Kubernetes interactive Bootcamp.

Sep 12, 2016

Kubernetes v2 Presentation

I have update my old Kubernetes presentation to contain the latest Kubernetes features.

Alexander Trost

Aug 29, 2016

Docker: Live restore option for containers

New flag in Docker daemon runtime allows to keep containers running even when Docker daemon is stopped.

Alexander Trost

Aug 11, 2016

OpenVSwitch: Persistent IP configuration under Rhel based distros

Persisting the interface IP configuration for OpenVSwitch interfaces/devices under Rhel based distros.

Alexander Trost

Aug 9, 2016

OpenVSwitch: Multi-Host Overlay Network

Creating a mutli-host overlay network between two and more servers.

Alexander Trost

Jul 29, 2016

Ceph: Build your own cluster on CentOS

Ceph is an object, a block and filesystem storage system.

Alexander Trost

Jul 26, 2016

SteamCMD: Not working on CephFS

A small and uncomplete analysis of why the SteamCMD is not working on CephFS.

Alexander Trost

Jul 9, 2016

Nuclear Fusion Presentation

Alexander Trost

Jun 27, 2016

PSA: Keep your computer clean!

Keep your computer(s) clean for them to work even now when a hot summer is around the corner.

Alexander Trost

May 25, 2016

Ansible User Management Role

A simple to use Ansible user management role made by me.

Alexander Trost

May 8, 2016

In search of a Webhosting

Some points to look out for when looking for a cheap and good shared webhosting.

Alexander Trost

Apr 30, 2016

SRCDS Server Restarter Script

SRCDS Server Restarter Script - Automatically restarts freezed/crashed SRCDS servers. Using only a Perl script and a Cronjob.

Alexander Trost

Apr 29, 2016

Docker for Admins Workshop Recap Presentation

Docker for Admins Workshop Recap in one small presentation.

Alexander Trost

Apr 1, 2016

Docker for Admins - Workshop v2

Improved version of the first "Docker for Admins"-Workshop. So to say the version 2.

Alexander Trost

Mar 27, 2016

ASCII Link Dump

This is a dump of links to sites, where you can create ASCII content/art, convert images to ASCII and more.

Alexander Trost

Mar 8, 2016

Docker for Admins - Workshop

This post is deprecated! Please move on to the new version of this post.

Alexander Trost

Mar 2, 2016

Online Courses! Online Courses Everywhere!

A list of some online course sites.

Alexander Trost

Feb 27, 2016

Kubernetes v1 Presentation

A presentation of some of the current Kubernetes features.

Alexander Trost

Feb 26, 2016

First Post

This is my first post on my blog Edenmal.

Alexander Trost