Adrian Wyssmann
I am family father of five children and husband of the most beautiful and most amazing women in the world. I am also a technology enthusiast especially when it comes to computer and software and I am big fan of Linux. I am also really into the DevOps mindset and I advocate for it.
As I believe a good developer highly adaptable and should always look for ways to improve his/her technical skills, so this is what I do. Which is also what motivates me to do this blog. My primary goal is to write down new or cool stuff which I’ve learned. Writing it down helps to comprehend it. The advantage is I can always look it up again and perhaps - sharing it - helps other people as well.
navi - an interactive cheatsheet tool for the command-line
While I am already fond of cheat.sh and pet, I found another exciting tool, navi
Posted May 18, 2022 by Adrian Wyssmann ‐ 3 min read
Cheat.sh - unified access to community driven cheat sheets
I already talked about some of cool open source tools, which help you to have cheatsheets and manage your kb
Posted May 17, 2022 by Adrian Wyssmann ‐ 2 min read
Import existing resources to Terraform
When working with Terraform, the changes are good that you are not starting from scratch, but you already have something setup previously and now want to manage it with Terraform
Posted May 12, 2022 by Adrian Wyssmann ‐ 9 min read
Terraform and Hetzner Cloud
While I had already looked into Terraform in the past, I am actually pretty new to it, and just started now to take a better look at it and working with it
Posted May 6, 2022 by Adrian Wyssmann ‐ 8 min read
Pet - A Command Line Snippet Manager
I always look to improve the way I work, often also by the help of tools. Github is always a good place to look what's new, and I eventually always find interesting tools which I did not knew before. For example pet, a command line snippet manager.
Posted April 27, 2022 by Adrian Wyssmann ‐ 3 min read
Infrastructure as Code (IaC) and Terraform
While I am am huge fan of Ansible not everything can be done out of the box. My issue particularly is the configuration of Cloudflare, which I still do via the Web UI.
Posted April 21, 2022 by Adrian Wyssmann ‐ 5 min read
How to install WSL on Windows 2019 server behind a corporate proxy
At my current employer we have to use Windows Server virtual machines as development environments. For me as a Linux fanboy, this is not a very nice experience, hence why not use WSL?
Posted March 1, 2022 by Adrian Wyssmann ‐ 4 min read
Flacky service connectivity on k8s production cluster while using fleet
As of a sudden, we started to experiencing connectivity issues in our production cluster. This post explain what happens and how
Posted February 25, 2022 by Adrian Wyssmann ‐ 5 min read
I did it again or how I messed up a kubernetes upgrade of the Rancher downstream cluster
While last week I upgraded the local Rancher cluster in non-production with issues, today was time for one of the downstream clusters. Let me explain what happened and what we learned out of it.
Posted February 15, 2022 by Adrian Wyssmann ‐ 4 min read
How I messed up a kubernetes upgrade of the Rancher local cluster
Today I wanted to update the local Rancher cluster to the latest kubernetes version, which went horribly wrong. Let me explain what happened and what we learned out of it.
Posted February 10, 2022 by Adrian Wyssmann ‐ 5 min read
Using a proxy server with groovy script in Jenkins
Sitting behind a corporate proxy may give you some additional security but it's often challenging to get things done. I really had some troubles to get the groovy script in jenkins to use the proxy server.
Posted February 9, 2022 by Adrian Wyssmann ‐ 4 min read
Testing webhooks with webhooks.site in an air-gapped environment
As a reader of my blog you are aware that at my employer we are using Rancher and MS Teams for alerting. Unfortunately this was not working properly, so I had to start debugging.
Posted February 2, 2022 by Adrian Wyssmann ‐ 3 min read
New ansible role papanito.backup
While using borg since a long, I recently decided to move to restic. As for that I have created a new ansible role
Posted February 1, 2022 by Adrian Wyssmann ‐ 2 min read
Unit tests with Python
In my previous post I gave an introduction to unit testing with Java. As personally I use Python, hence I give you a quick intro into unit testing with Python
Posted December 13, 2021 by Adrian Wyssmann ‐ 3 min read
Unit Testing and Code coverage in Java
I previously discussed code coverage. In this post I would like to focus on code coverage for Java, as a concrete example. As part of that I also introduce the basics of unit testing for Java.
Posted December 7, 2021 by Adrian Wyssmann ‐ 6 min read
Code coverage
Code quality is important and as part of this we are usually also interested in the code coverage. But what is code coverage and what we can do with it?
Posted December 6, 2021 by Adrian Wyssmann ‐ 5 min read
Zellij, an alternative to screen and tmux
Terminal window managers are very helpful. I found Zellij, which seems to be a very nice alternative to tmux and screen
Posted December 5, 2021 by Adrian Wyssmann ‐ 3 min read
Debugging Network Issues in K8s
A collection of useful information for debugging network issues in k8s
Docker images for debugging network issues in K8s
Troubleshooting networking issues in docker and kubernetes is often difficult and the root cause can be in different places including the underlying networking infrastructure. I have collected some information which might be helpful.
Posted November 21, 2021 by Adrian Wyssmann ‐ 2 min read
Useful kubectl and helm commands
A collection of useful kubectl and helm commands aka. kubectl cheatsheet
Deploy RHACS with Rancher fleet
In my last post I talked about Rancher fleet, as a next step we will manage RHACS with fleet.
Posted November 10, 2021 by Adrian Wyssmann ‐ 4 min read
Fleet, the GitOps tool embedded in Rancher
There are a lot of different GitOps solution out in the field. But when you are using Rancher, you already have one at hand. As a Rancher user, I had a look what it is and how it works
Posted October 29, 2021 by Adrian Wyssmann ‐ 5 min read
Kubernetes node is unavailable due to permanently crashing rancher-agent pod
After our kubernetes cluster was fine for some weeks, one of our nodes was suddenly unavailable due to permanently restarting rancher-agent
Posted October 22, 2021 by Adrian Wyssmann ‐ 4 min read
Tux-Tage 2021
Tux-Tage is a live moderated online event that consists of lectures, discussions, workshops and much more about the world of free software. The event is in German.
Posted October 20, 2021 by Adrian Wyssmann ‐ 0 min read
Hosttech GmbH, a swiss-based datacenter and cloud provider
For some reason I got a free version of PCTipp, a Swiss PC magazine. Within the last issue, I found a promoted article about Hosttech GmbH, which now offers a virtual datacenter. Interesting enough for me to register and try it out.
Posted September 28, 2021 by Adrian Wyssmann ‐ 3 min read
Network simulation with GNS3 and CML
As I am currently working on refreshing my networking skills and as I want to get deeper into network security, I was looking for some courses. As part of this research, I stumbled over GNS3 and CLM, both tools to create virtual lab environments.
Posted September 26, 2021 by Adrian Wyssmann ‐ 6 min read
Use Archlinux as your pentest distribution
Often pen-tester/security expert/hacker use Kali Linux or Parrot as their distro of choice. While they are great, I use Archlinux as my daily driver. Thus I want to have the same toolset as these distros installed and configured on my Archlinux
Posted September 19, 2021 by Adrian Wyssmann ‐ 2 min read
How to add encoded key- and truststore to K8s secret
Working with java applications in kubernetes, you might come use
Posted September 9, 2021 by Adrian Wyssmann ‐ 2 min read
Keystore and Truststore in Java
Working with java applications in you might know what is a keystore and what is a truststore. For the ones not aware, here a quick intro.
Posted September 9, 2021 by Adrian Wyssmann ‐ 3 min read
Rancher 2.5.x v2 logging using splunk
Installing and configuring logging with Rancher is quite easy, but in combination with Splunk some guidance might be helpful. I guide you trough the process of the complete installation and configuration
Posted September 9, 2021 by Adrian Wyssmann ‐ 5 min read
Rancher 2.5.x monitoring and alerting with MS Teams
Installing monitoring and configuration with Rancher is quite easy, but in combination wit alerting for MS Teams some guidance might be helpful. I guide you trough the process of the complete installation and configuration
Posted September 9, 2021 by Adrian Wyssmann ‐ 5 min read
Collecting logs from salt-managed nodes without ssh access
We manage our baremetal kubernetes nodes with salt and for security purposes, there is no direct ssh access. The only way to access them is using salt-master. This can be challenging if you want to get some files from the nodes, but it's possible.
Posted September 8, 2021 by Adrian Wyssmann ‐ 3 min read
Your first Kubernetes deployment
Kubernetes is complex and at first overwhelming if you never did something with it. In this post I want to focus on a simple deployment and putting some pieces (Pod, Deployment, ConfigMap, Ingress) together to get a better understanding for newbies.
Posted August 17, 2021 by Adrian Wyssmann ‐ 4 min read
Manually create certificates and certificate signing request
As we don't have an automated certificate management 😭 we have to create certificates and Certificate signing request manually. If you are in the same boat, this information might help you.
Posted August 15, 2021 by Adrian Wyssmann ‐ 2 min read
Upgrade istio, monitoring and logging from Rancher 2.4.x. to 2.5.x
While we are using Rancher 2.5.x our current cluster management solution, we actually still are using the old istio- and monitoring-stack v1 rather than v2. We want to change that but it is not as easy as we thought.
Posted August 5, 2021 by Adrian Wyssmann ‐ 4 min read
New ansible role papanito.systemd_notifiers
Based on my last blog post, I've created a new ansible role to setup a systemd notification service for failing systemd services
Posted July 18, 2021 by Adrian Wyssmann ‐ 1 min read
Notifications for failing Systemd services
When systemd services fail you usually don't really notice it unless it's a critical service. However there may be situations where it would be nice that you are mare aware of failing services.
Posted July 16, 2021 by Adrian Wyssmann ‐ 3 min read
How I manage my dotfiles
It is common practice to track dotfiles with a version control system like Git and to synchronize them across various hosts. There are various approaches, so I would like to tell you how I do it
Posted July 15, 2021 by Adrian Wyssmann ‐ 4 min read
Adminforge - hosted free services for free
Posted July 13, 2021 by Adrian Wyssmann ‐ 1 min read
Link Collection Update
Github has a lot of interesting projects and resources and you can easily star them. However, it's hard to remember what you starred so I've updated my collection of links in order to better highlight and find tools
Posted July 13, 2021 by Adrian Wyssmann ‐ 1 min read
Packet filtering in Linux - iptables, nftables and firewalld
Packet filtering is essential for network security and Linux offers this out of the box. There are different possibilities like iptables, nftables or firewalld, and a basic understanding of these is very useful.
Posted July 9, 2021 by Adrian Wyssmann ‐ 8 min read
Connect an on-premises network to Azure
While modern companies may use a pure cloud approach, there are still companies which still have their own datacenter. Thus connecting your on-premiss network to the cloud is essential. In this post, I will have a look on how this works and what is required, focusing on Azure, as this is what we currently use at my employer.
Posted July 7, 2021 by Adrian Wyssmann ‐ 1 min read
Microsoft Azure: Connect an on-premises network to Azure
Outline the ideas and possibilities of connecting an on-premises network to Azure
Linux on Microsoft Azure
While starting to look at Azure, I am positively surprised on how Linux and open source (databases) are supported. Thus I want to mention a few words about it.
Posted July 5, 2021 by Adrian Wyssmann ‐ 2 min read
Cheatsheets and KB
Until know I have my own cheatsheet section in may website. Even so writing them helped me to memorize some stuff, they are far from complete. Thus I decided to drop them in favor of community driven solutions.
Posted July 1, 2021 by Adrian Wyssmann ‐ 4 min read
Authentication and Authorization in Kubernetes
Authentication (who am I) and authorization (what I am allowed to do) are essential and thus having a basic understanding on how Kubernetes handles this, is very useful.
Posted June 23, 2021 by Adrian Wyssmann ‐ 11 min read
What is the Kubernetes API and CRD
When working with Kubernetes CRDs is something that you will stumble upon, so you should know what it is. But this does not go without understanding the main principles of the Kubernetes API
Posted June 21, 2021 by Adrian Wyssmann ‐ 6 min read
Microsoft Azure Fundamentals
As we start looking into Azure, my employer established a Microsoft Enterprise Skills Initiative. This is my first course and I will summarize for you what I've learned
Posted June 10, 2021 by Adrian Wyssmann ‐ 1 min read
Microsoft Azure: Access and Resources
Summary of what I learned in the complete course for my Azure certifications
Microsoft Azure: AI service
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Compute
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Container Services
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Database and Analytics Services
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Migration
Summary of what I learned in the course Microsoft Azure Fundamentals AZ-900 about migrating to azure
Microsoft Azure: Networking Services
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Observability
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Security and Network Security
Summary of what I learned in studying for my Azure certificates
Microsoft Azure: Storage Services
Summary of what I learned in studying for my Azure certificates
What is cloud computing?
As I start looking into Azure, I thought it may be a good starting point to look into understanding what cloud computing is
Posted June 7, 2021 by Adrian Wyssmann ‐ 8 min read
Self-Paced Studying of Programming and SW Engineering
Not everybody can afford a study at an university, either cause you cannot afford it or you have other obstacles e.g a mother or father taking care of children. However, this should not stop you to study what you like. There are some nice collections of resources that allow you to study informatics, programming and sw engineering for free.
Posted June 5, 2021 by Adrian Wyssmann ‐ 2 min read
What is istio?
I introduced the basics of a service-mesh in my last post. Here I will go into more details of isito, one of the most known service mesh in the kubernetes world.
Posted May 31, 2021 by Adrian Wyssmann ‐ 6 min read
What is as a service mesh?
You may have heard the term service mesh but what is it exactly? With this post I try to get an understanding of what a service mesh is and when it is used.
Posted May 28, 2021 by Adrian Wyssmann ‐ 5 min read
Crowdsec, a collaborative behavior detection engine
Last Wednesday I was attending the DevOps Connect: DevSecOps at RSAC 2021, whereas a cool project was presented: Crowdsec, a collaborative behavior detection engine, coupled with a global IP reputation network
Posted May 22, 2021 by Adrian Wyssmann ‐ 11 min read
What is Stackrox (Red Hat Advanced Cluster Security for Kubernetes)?
At my current employer we use a container security platform called Stackrox, which recently was acquired by RedHat. But that is it exactly and for what is it good?
Posted May 17, 2021 by Adrian Wyssmann ‐ 6 min read
Update of packer-vagrant project using HCL
Since I last used packer it's been a while and when I recently wanted to create a new Windows vm, I used my project. This is where I realized certain things have changed with packer since I started the project.
Posted May 13, 2021 by Adrian Wyssmann ‐ 2 min read
List of Free Developer Resources (XaaS)
During the years, I tried different services. Some of them offer offered free tiers/plans for developers or small teams. So I thought it would make sense to create a list, which can be easily shared with others.
Posted May 12, 2021 by Adrian Wyssmann ‐ 1 min read
Convert Manjaro Linux back to Arch Linux
Manjaro is e very popular distribution based on Arch. I tried it for several months ultimately decided to switch back to pure Arch. But how to do so, without a complete new installation?
Posted May 7, 2021 by Adrian Wyssmann ‐ 6 min read
Flameshot: A cool tool to make screenshots under Linux
Writing technical blogs often requires to do screenshot, where you may also want to highlight stuff of even obsfucate sensitive data.
Posted May 5, 2021 by Adrian Wyssmann ‐ 2 min read
Create an encrypted container in Linux
In case you have sensitive files which you want to additionally protect, you could add the to a zip file and encrypt the zip file. Or you might as well use an encrypted container
Posted May 5, 2021 by Adrian Wyssmann ‐ 2 min read
Introduction to Grafana Cloud
If you have servers you definitively want to collect logs in a central place and store them for some time, so you can investigate what happens in case of issues. I personally rely on logz.io, but Grafana Cloud looks like a promising alternative
Posted May 3, 2021 by Adrian Wyssmann ‐ 5 min read
Introduction to Logz.io
If you have servers you definitively want to collect logs in a central place and store them for some time, so you can investigate what happens in case of issues. I personally rely on logz.io
Posted May 1, 2021 by Adrian Wyssmann ‐ 3 min read
Continuous integration (CI), continuous deployment (CD) and continuous delivery (CD)
As a developer you are familiar with the terms continuous integration (CI) and continuous deployment (CD), which is often referred as CI/CD. However it's important to understand that these are different processes with different purposes.
Posted April 30, 2021 by Adrian Wyssmann ‐ 5 min read
New major release 3.0.0 of ansible role papanito.cloudflared
I finally found some tome to improve my cloudflared ansible role, to be abel to use named tunnels
Posted April 25, 2021 by Adrian Wyssmann ‐ 1 min read
Microsoft Enterprise Skills Initiative
As we start looking into Azure, my employer established a Microsoft Enterprise Skills Initiative.
Posted April 23, 2021 by Adrian Wyssmann ‐ 1 min read
Automated OS update with kured for servers running k8s
If you are running a bare-metal cluster you probably run kubernetes on top of some linux os, these systems have to be regularly updated. But an update means sometimes that you have to reboot your servers. This also means during a reboot that particular node is node available to schedule workload.
Posted April 20, 2021 by Adrian Wyssmann ‐ 6 min read
How to know when your Linux system requires a reboot
When you manage Linux systems it's usually pretty clear how to reboot a system. But do you know how to check whether a system requires a reboot? Cause you don't want to reboot a system if it is not necessary
Posted April 20, 2021 by Adrian Wyssmann ‐ 2 min read
What is Cloudflare and why I love it
Ever since I discovered Cloudflare I am a big fan of it. They offer a lot of great products, especially also for me as an individual with a very tiny - or non-existent - IT budget.
Posted April 19, 2021 by Adrian Wyssmann ‐ 5 min read
Linux Presentation Day (LPD)
Did you ever heard of Linux Presentation Day (LDP). If not, I will tell you about.
Posted April 16, 2021 by Adrian Wyssmann ‐ 2 min read
How to work with multiple projects in Hetzner Cloud
In Hetzner Cloud you can have multiple projects. As you can have different members per group, it really makes sense to have different projects for different purposes. I will explain in this article on how I work with multiple projects in Ansible, as well when using the cli
Posted April 16, 2021 by Adrian Wyssmann ‐ 3 min read
How to pass lists and dicts as extra vars when running an ansible playbook
Passing simple strings to an ansible playbook as extra-vars is easy, but what if you want to pass lists or dictionary? Let's see...
Posted April 16, 2021 by Adrian Wyssmann ‐ 4 min read
Re-use artifacts (playbooks, tasks, ...) in Ansible
I recently struggled into an issue where I have certain tasks which I want to run for the bootstrapping, as well when applying the desired state. I don't want to have to repeat the same task in different playbooks, so I had a look into reusable of ansible elements
Posted April 15, 2021 by Adrian Wyssmann ‐ 4 min read
What are tags in Ansible and how to use them
Sometimes you have playbooks or roles which you only want to execute parts of it and not all. This is where you can use ansible tags.
Posted April 14, 2021 by Adrian Wyssmann ‐ 8 min read
How to push docker images to another registry
Sometimes it may be necessary to 'copy' docker images from one registry to another one - which is a very easy thing to do
Posted April 12, 2021 by Adrian Wyssmann ‐ 2 min read
Create Firewalls for Hetzner Cloud using Ansible
Firewall for Hetzner Cloud is relatively new, but since I use ansible I really would like to create my firewalls the same way I to all my other stuff
Posted April 8, 2021 by Adrian Wyssmann ‐ 1 min read
Dynamic inventory with Ansible and Hetzner Robot and Hetzner Cloud
I use Hetzner Servers and Hetzner Cloud for my own infrastructure which I setup with Ansible since the beginning. It's usually not much servers so overseeable. However, maintaining static inventory for my ansible project is a bit cumbersome when you already have all information available in the management interface. So let's see what we can do about and how I can reduce manual overhead.
Posted April 8, 2021 by Adrian Wyssmann ‐ 6 min read
Story Points - Equating Points to Time
There is often a huge misunderstanding what story points are, so let's have quick look at what they are
Posted April 7, 2021 by Adrian Wyssmann ‐ 2 min read
Open letter to remove Richard M. Stallman from all leadership positions
Posted March 25, 2021 by Adrian Wyssmann ‐ 1 min read
Diagrams as Code: Plantuml or Mermaid
Drawing diagrams is a common task as sw developer and one is often used to draw them actually in something like Visio or draw.io.
Posted March 25, 2021 by Adrian Wyssmann ‐ 3 min read
How to get a time difference of two log entries
I recently was tasked with a small problem on how to get a time difference of two log entries
Posted March 23, 2021 by Adrian Wyssmann ‐ 5 min read
Implementing a vulnerability Waiver Process for infected 3rd party libraries
Here I want to explain why and how I engineered a vulnerability Waiver Process for infected 3rd party libraries.
Posted March 18, 2021 by Adrian Wyssmann ‐ 9 min read
Sign your commits with a gpg key
Often open source projects require you to sign your git commits in order to verify they are coming from you. I made a quick tutorial on what is needed.
Posted March 15, 2021 by Adrian Wyssmann ‐ 4 min read
How to rescue data from windows
My son has a Surface Go Tablet which suddenly stopped booting. Even after trying to uninstall patches etc. I could not bring it back, so I decided to help him to get the data from the tablet, so he can use it.
Posted March 13, 2021 by Adrian Wyssmann ‐ 3 min read
How to increment versions in maven builds - alternative to maven release plugin
Maven release plugin does a great job incrasing the version in maven builds. Still sometimes you may need an alternative.
Posted March 3, 2021 by Adrian Wyssmann ‐ 3 min read
Update Your Rss Reader
The link to the rss feed has changed
Posted February 22, 2021 by Adrian Wyssmann ‐ 1 min read
Switching Static Website Generator
Switching my website from Jekyll to Hugo and the reasons why
Posted February 21, 2021 by Adrian Wyssmann ‐ 8 min read
Jenkins plugin repo as proxy repo when behind a corporate proxy
Jenkins is a very popular ci solution and offer a lot of extensibility by plugins. However, updating these plugins while you are sitting behind a corporate firewall. I explain you what is the issue and how we solve it.
Posted May 20, 2020 by Adrian Wyssmann ‐ 3 min read
Kubernetes
My collection of Kubernetes related docu
Microsoft Azure
My learning notes about Azure
papanito.systemd_notifiers
Ansible role to setup a systemd notification service for failing systemd services
Build and automation Tools
Useful build and automation tools
Cheatsheet and KB
Useful tools under Linux for Cheatsheet and KB
Cloud Infrastructure
Tools for your cloud infrastructure incl. Cloud and Kubernetes
Development Resources
Collection of Development Resources and Frameworks
E-learning
A collection of resources that help you to study programming and sw engineering by yourself and for free
Infrastructure (cloud, k8s)
Tools for your Infrastructure incl. Cloud and Kubernetes
Kubernetes
Tools Kubernetes
Linux commands alternatives
Linux commands alternatives
Misc Tools
Useful tools for prototyping, docus and others
Security and Pen-Testing
Resources related to IT security and pen-testing
Tools for Linux and Windows
Useful tools for Linux and Windows
Tools for Pentesting
Useful tools for Pentesting
Tools for Storage, File Transfer and Backup
Useful tools for storage, file transfer and backup
Tools for Windows
Useful tools for Windows
Declarative pipelines with Jenkins
I guess working in sw development we all know Jenkins and the ones how have to maintain it, knows the pain it can cause. Still, even if there are (better) alternatives, Jenkins may still be the first choice for a lot of companies. I would like to share here some things, which helps to reduce duplication of code and sharing pipelines among teams.
Posted June 14, 2021 by Adrian Wyssmann ‐ 11 min read
Regular Expression - ignore or exclude a specific word, find everything else
I want to use a regular expression to exclude a complete word. I need this for a particular situation which I explain further
Posted March 24, 2021 by Adrian Wyssmann ‐ 2 min read
gpg
Cheatsheet for gpg
Links
My links collections
Online tools and services
Useful online tools and services
papanito.git
This role is used for simplified git checkouts using a list of git repos.
papanito.ttrss
ansible role to install ttrss with all it's dependecies (php, postgres, lighttpd)
papanito.borg
Ansible role do install and setup regular backups with borg-backup
papanito.rsyslog
Ansible role to forward syslog to a log service like Loggly.com or Logz.io
Privacy Policy
Our Privacy Policy
papanito.cloudflared
This ansible role does download and install cloudflared on the host and optionally installs the argo-tunnel as a service.
Projects
My personal projects
Cheatsheets
Collection of cheatsheets
Code of Conduct
Contributor Covenant Code of Conduct
Docs
Technical documentation, educational docs and tutorials
Our Thesis
Task and objectives of the diploma thesis
Installation of dependencies of an ansible role
Some observations regarding using dependencies in ansible roles
Posted February 4, 2021 by Adrian Wyssmann ‐ 3 min read
Low-cost news aggregator solution with Tiny Tiny RSS - a feedly alternative
Posted February 3, 2021 by Adrian Wyssmann ‐ 3 min read
Hetzner Cloud referral
Posted February 1, 2021 by Adrian Wyssmann ‐ 1 min read
Successful jenkins build remains "In Progress" in Bitbucket - and how to workaround
It may happen that even so successful jenkins build remains "In Progress" in Bitbucket.
Posted January 13, 2021 by Adrian Wyssmann ‐ 3 min read
git hooks
Did you ever pushed stuff to a git repo and then breaking your branch, just cause you did not checked beforehand, if all is fine. I'm sure you did. Wouldn't it be just cool if some checks ran automatically before committing or pushing?
Posted December 31, 2020 by Adrian Wyssmann ‐ 2 min read
ansible role cloudflared - remove unlisted services
Posted December 21, 2020 by Adrian Wyssmann ‐ 3 min read
My first self-hosted kubernetes cluster with RKE
Posted November 18, 2020 by Adrian Wyssmann ‐ 7 min read
Podman - a daemon-less docker alternative
Podman is a daemonless container engine for developing, managing, and running OCI Containers on your Linux System. Containers can either be run as root or in rootless mode.
Posted November 13, 2020 by Adrian Wyssmann ‐ 6 min read
Kubernetes - a brief introduction to container orchestration
Posted November 10, 2020 by Adrian Wyssmann ‐ 15 min read
Github actions release workflow
Even so I mostly use Gitlab, I am also active in Github, especially also for the ansible roles which I host in GIthub - just cause everything related to ansible can also be found there.
Posted August 3, 2020 by Adrian Wyssmann ‐ 5 min read
My ansible roles
In meanwhile I got some experiences in writing roles and yesterday I finally finished my 3rd role - for me this is much considering my spare time left after work and family.
Posted July 23, 2020 by Adrian Wyssmann ‐ 2 min read
Nextcloud
Cheatsheet for Nextcloud
My Cheatsheets - Update
I've update the collection of my personal cheatsheets - you can find them also on the top-left menu
Posted April 13, 2020 by Adrian Wyssmann ‐ 1 min read
Linux
Cheatsheet for linux commands
Remote Work Tips and Tricks
Posted March 18, 2020 by Adrian Wyssmann ‐ 5 min read
Extended Backus Naur Form (EBNF)
A quick introduction to Extended Backus Naur Form (EBNF)
Posted November 15, 2019 by Adrian Wyssmann ‐ 7 min read
October is Cyber Security Awareness month
Posted October 14, 2019 by Adrian Wyssmann ‐ 1 min read
Powershell
Cheatsheet powershell
vi
Cheatsheet for vi
Create jenkins JLNP slave programmatically
Adding a slave to a Jenkins master always required to add the slave via the GUI and then gather the secret in order to be able to connect the slave. So I was wondering whether a slave could be created programmatically.
Posted March 15, 2019 by Adrian Wyssmann ‐ 2 min read
Cheatsheet vi
Posted March 8, 2019 by Adrian Wyssmann ‐ 1 min read
How to work with git - a newbie guide
I got in touch with git when I was starting using Github. However as these projects were merely single contributor projects, some basic commands did it for my work there. There was no branching, no rebasing or whatsoever. Now after working on a daily basis with git and using it in big(ish) teams, I thought to write down a little guide for newbies on how to work with git.
Posted March 4, 2019 by Adrian Wyssmann ‐ 12 min read
Back again, everything new
Wow it has been already one year since I published my last blog entry. How time passes... Not that I have nothing to write, in contrary there are a lot of new exciting things I have done and learned in the past 1 and a half year since I've started my new job. Hopefully I find time again to write more again cause I really want to share whatever I can.
Posted March 1, 2019 by Adrian Wyssmann ‐ 2 min read
Introduction to Saltstack
Posted April 16, 2018 by Adrian Wyssmann ‐ 10 min read
Saltstack
Cheatsheet for Saltstack
Sync git repos between different Git git hosters
Posted March 22, 2018 by Adrian Wyssmann ‐ 2 min read
Access Github from behind a proxy
Posted March 20, 2018 by Adrian Wyssmann ‐ 1 min read
git
Cheatsheet for git
Configuration Management and Testing
Configuration management has always been a challenging topic. But what is it? Why is it so challenging?
Posted December 21, 2017 by Adrian Wyssmann ‐ 2 min read
My JavaScript journey - Part 2 - Server Side Scripting and Node.js
Posted November 30, 2017 by Adrian Wyssmann ‐ 11 min read
My JavaScript journey - Part 1 - Basic Introduction
Posted November 2, 2017 by Adrian Wyssmann ‐ 3 min read
Cleanup of Windows
I recently run into the problem that my Harddisk (250GB) run full. Especially when installing Visual Studio, different SDKs (.Net, Android, ...), Microsoft Office, etc. your disk space may become rare. The problem is not only because of the size of these software but also cause Windows is keeping a lot of (unnecessary) files in various locations.
Posted October 19, 2017 by Adrian Wyssmann ‐ 5 min read
Introduction to Maven
Maven is a tool to automate the building, distribution and dependency management of software artifacts in a project. It is one of many build systems but currently heavily used in the Java world.
Posted October 2, 2017 by Adrian Wyssmann ‐ 5 min read
Build and Test .NetCore2.0 app with Jenkins
Recently, for a job interview I had to solve a development task: Create a .NET C## application which converts digital numbers into roman numbers
Posted September 20, 2017 by Adrian Wyssmann ‐ 7 min read
Why I use Visual Studio Code on Linux
Posted August 1, 2017 by Adrian Wyssmann ‐ 3 min read
Docker basics hands-on
I wrote quick "Hands-on" for beginners to cover docker basics with simple containers so I won't go into details of complex application, service definitions or swarms. What I want to do is run a webserver inside a container with persistent data
Posted April 27, 2017 by Adrian Wyssmann ‐ 3 min read
Running first Atlas Linux Box under Windows
Posted April 25, 2017 by Adrian Wyssmann ‐ 3 min read
Vagrant vs. Packer
When I started to investigate into tools which help to automate provision of virtual machines, I found packer and vagrant, both tools provided by Hashicorp.
Posted April 13, 2017 by Adrian Wyssmann ‐ 8 min read
Unattended Installation of Linux and Windows
Unattended installation is the possibility to install an operating system without human interaction. Principally it is the same for Windows and Linux: An "answer file" which describes the configuration is provided as an input for the installer. These "answer files" provide any kind of setup options including how to partition disks and what packages/features to install.
Posted April 12, 2017 by Adrian Wyssmann ‐ 4 min read
Powershell Remoting
Powershell remoting enables to work on a remote computer as you may be used on Linux using ssh. In difference to Linux, where this is usually straight-forward, I find it a bit more complicated on Windows - however achievable. There are two was a remote PS connection can be established - via HTTP or HTTPS.
Posted March 11, 2017 by Adrian Wyssmann ‐ 6 min read
First Docker image for Windows
Posted March 10, 2017 by Adrian Wyssmann ‐ 5 min read
MobaXterm - a powerful terminal for Windows
Posted February 20, 2017 by Adrian Wyssmann ‐ 2 min read
DSC - Desired State Configuration
Posted February 13, 2017 by Adrian Wyssmann ‐ 5 min read
Open data platform of the swiss public transport - update
Posted January 27, 2017 by Adrian Wyssmann ‐ 1 min read
Docker on Windows
Everyone loves docker even Microsoft embraces docker.
Posted January 11, 2017 by Adrian Wyssmann ‐ 8 min read
Docker and Data Storage
Not everything can live without persistent storage, so let's see how docker offers and handles it.
Posted December 23, 2016 by Adrian Wyssmann ‐ 12 min read
Snapshots with Virt-Manager
My work computer runs on Windows, so whenever I quickly need a VM, I use Virtualbox or VMWare Workstation. But my home computer runs on Linux and there I use KVM/Qemu instead - yes I also could use Virtualbox but I don't.
Posted December 23, 2016 by Adrian Wyssmann ‐ 1 min read
Arch Linux Security Tracker Announced
Yesterday the Arch Linux Security Team the new security tracker for Arch Linux
Posted December 22, 2016 by Adrian Wyssmann ‐ 2 min read
False negative / false positive tests
Software testing is not only running test cases but more of using a testers mindset and skills to find bugs and verify that the software is working correctly. However, usage of test cases (manual or automated) is essential to speed-up your testing and having reproducible tests for your regression testing. Obviously you want to be able to trust the tests - especially the outcome of these tests. However, regardless whether it is manual or automated testing, there are two terms you should understand and bear in mind. So what is it?
Posted December 19, 2016 by Adrian Wyssmann ‐ 8 min read
Open data platform of the swiss public transport
The public transport organization SBB recently opened platform for customer information data on public transport in Switzerland. Anyone can obtain obtain data on public transport free of charge and get access to specific public transport services for all licensed transport companies in Switzerland. The platform provides timetable, real-time and actual data.
Posted December 13, 2016 by Adrian Wyssmann ‐ 6 min read
Test data from production and data protection
Posted December 11, 2016 by Adrian Wyssmann ‐ 5 min read
Windows Subsystem for Linux (WSL)
Posted December 7, 2016 by Adrian Wyssmann ‐ 9 min read
Docker - what is it?
Posted December 5, 2016 by Adrian Wyssmann ‐ 13 min read
Do you spot it ...
Recently found on the entrance of a parking in the city of Lucerne. One of the signs does not seem right...
Posted December 3, 2016 by Adrian Wyssmann ‐ 1 min read
Segmentation Fault with apps under Gnome and Wayland
Posted November 29, 2016 by Adrian Wyssmann ‐ 1 min read
Setup Arch Linux on my new Acer Aspire V7 Nitro
Posted November 25, 2016 by Adrian Wyssmann ‐ 9 min read
Regular Screenshot of a website
Posted November 2, 2016 by Adrian Wyssmann ‐ 2 min read
Test Data Management
Test data management is crucial on the test engineering process and therefore shall be considered carefully. But what is 'Test Data Management' and why is it important?
Posted October 21, 2016 by Adrian Wyssmann ‐ 14 min read
How to report bugs?
When I used to work as test manager I encouraged my people to write issues/bugs that have certain quality. But actually this is not only true for testers but generally for everyone who reports bugs - especially if you are not in direct contact with the developers.
Posted October 17, 2016 by Adrian Wyssmann ‐ 7 min read
Microsoft Azure - First steps
Working for my current employer, I have an MSDN subscription and access to Microsoft azure. I also have a nice amount of credits to spend, so it's good opportunity to get warm with Azure.
Posted October 5, 2016 by Adrian Wyssmann ‐ 17 min read
My first steps with Ansible
Posted September 28, 2016 by Adrian Wyssmann ‐ 10 min read
Regex101
Posted September 26, 2016 by Adrian Wyssmann ‐ 1 min read
.Net on Linux
.net core seems promising and can be used on linux as well. Let's have a look.
Posted September 15, 2016 by Adrian Wyssmann ‐ 2 min read
Unit Testing with Junit
Posted August 15, 2016 by Adrian Wyssmann ‐ 3 min read
Record your console session
Posted August 8, 2016 by Adrian Wyssmann ‐ 1 min read
Missing Languages in your Linux Distribution
Posted August 3, 2016 by Adrian Wyssmann ‐ 1 min read
Online Books
Posted August 3, 2016 by Adrian Wyssmann ‐ 1 min read
Current Date on Shell
Posted August 1, 2016 by Adrian Wyssmann ‐ 1 min read
Welcome on my site
Posted August 1, 2016 by Adrian Wyssmann ‐ 1 min read
Test Data
Test data is very important for testing, but why? and what is test data?
Posted April 6, 2016 by Adrian Wyssmann ‐ 6 min read
Diploma Thesis
Diploma Thesis of Computer Science study in HTI Biel
Project Docs
Some technical details and documentation