Posts

• 19 Feb 2021

  Explore Container Images Without A Shell

  A best practice in building container images is to add as little dependencies as possible into the image. Most applicati...
• 05 Feb 2021

  Set Default Annotations with Kyverno

  Kyverno is a policy engine for kubernetes. It allows you to implement ValidatingAdmissionWebhooks and MutatingAdmissionW...
• 08 Jan 2021

  My Personal Backup Design

  Compute devices may fail and lose your data. Hardware failures, software bugs and encrypting trojans threaten your data....
• 15 Dec 2020

  Linkdump: CPU alerts and why they are mostly useless

  This article from my reading backlogs shows a nice summary why your CPU alerts are mostly useless. https://blog.koehntop...
• 28 Oct 2020

  Lookup Public IP via Commandline

  When working from home, I have a changing public IP. My ISP assigns me a new public IP on every router reboot. For debug...
• 07 Jun 2020

  The Non-Obvious properties of JSON Encoder.Encode directly to http.ResponseWriter

  Today I came across the following code snipped in a golang HTTP handler: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 import( "...
• 30 May 2020

  Managing Kubernetes Ingress JSON Log Format with Sanity

  The nginx ingress supports a custom log format. The option can be set via the log_format field in the ingress configmap....
• 27 May 2020

  Moving the NAS

  I had to move my NAS into the basement. There is no room in our flat left for noisy computer equipment. My flat is in th...
• 13 May 2020

  Set Default Value of Prometheus Label if not set

  I had to implement the following behaviour in a prometheus relabel config: Given two labels A and B. I want to set A to...
• 11 May 2020

  On Errors in Golang

  In Golang are two ways to signal an error in a function or method. The first is the convention to return an error value ...
• 08 May 2020

  On Using Fluentd to Parse Elastic Common Scheme from Kubernetes Pod Logs

  Today I had to parse the JSON logs of our containers in Kubernetes. Our application are logging in the Elastic Common Sc...
• 08 May 2020

  Mount Local GOPATH Directory into Container

  Given you have an old golang project depending on the GOPATH. You want to build that project in the golang docker image....
• 04 May 2020

  Migrate Elasticsearch 5.x to 6.x

  We want to migrate an pre 6.0.0 cluster to 6.x.x. Therefore we have to make sure every index contains only one mapping. ...
• 04 May 2020

  Initial Commit

  Initial post to test the theme and all the other stuff.