In one of my clients projects, we are moving some parts from a monolithic PostgreSQL database into some microservices, which use MongoDB for their persistence. The whole migration can be done with native tools — psql and mongoimport to be precise — which results in a very high speed.

The Plan

MongoDB is a document-oriented database, which still has some introspective into the values. These can take up different basic types likes String, Integers or Booleans — and since the version 3.4 of MongoDB, the mongoimport-tool can import a CSV with specific markers to set the type of the field.

So, the…

Davis Turner: Reckitt-Benckiser shoot for Ryder, used under CC-BY-SA-3.0 from

In my team and at my present contract at the Haufe-Group in Freiburg, we are using Continuous Integration and Continuous Deployment with a Kubernetes infrastructure — in my team on our own baremetal servers, at Haufe in Azure. What we did not tackle sufficiently so far is storage — and we do not seem to be alone.

I’ve reviewed the state of Kubernetes storage options in mid-2017 with a focus and Free and Open Source products, namely

  • Ceph with
  • Infinit by Docker Inc.
  • NFS-HA with DRBD and pacemaker
  • GlusterFS with Heketi

You can read the result in the Haufe Developer Blog.

How not to revert back into old habits

Every organism on the world is a creature of habit. We like predictability and are usually not very fond of changes — change resistant, so to speak. However, not all habits and behaviours are good — we have some role to play in our direct and indirect environment, and some habits and behaviour may stand in our way in playing the role we wish to play.

Changing a behaviour usually consists of three steps:

  1. Recognizing the problem (the status quo),
  2. finding a solution (the goal of the change) and finally
  3. implementing that solution into your life.


Lars Kumbier

IT Consultant

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