Kubernetes – WirelessMoves

Kubernetes Intro – Part 4 – Persistent Storage

I’m almost happy with the basic hands-on understanding I have gained about Kubernetes about which I have written in part 1 to 3 of this series. I understand much better now how Kubernetes manages Docker containers, how it abstracts and manages the distribution of containers in a cluster of servers and how it makes services running in containers reachable from the outside world. From a developer and network administrator point of view, however, one important thing is still missing: How does Kubernetes manage persistent storage for containers? So let’s have a look at this and also experiment with a hands-on example: Running a WordPress Blog with a MySQL database in a Kubernetes cluster. As you will see, it’s not rocket science.

Kubernetes Intro – Part 3 – Create, Dockerize and Push Into the Cluster

So here’s the story so far: In parts 1 and 2 of my Kubernetes intro story, we have set up a Minikube Kubernetes Cluster. We then deployed a container with an app inside, which was downloaded directly from the Kubernetes image hub, into our cluster. Our cluster is small, it only contains one worker node and the container we put into a pod was the only service running in our cluster. If you could follow this description you are now ready for part 3 of the story. Based on what we have done so far we now create our own app, create a Docker image in which the app can run and then deploy it into our Kubernetes cluster. In the end we will have two services running in the cluster: The Echoserver app from part 2 and the app we are going to put together in this episode.

Kubernetes Intro – Part 2 – The Dashboard

In part 1, I’ve given an introduction to my path to learn more about Kubernetes with a hands-on approach. The story ended with Minikube being installed and a first sample application (the ‘http echosever’) up and running in a container that is managed by Kubernetes. With all of this in place now, the next logical step is to have a closer look at the browser based Kubernetes dashboard and what it shows about this small container deployment.

Kubernetes Intro – Part 1

When we are talking about the 5G Core and implementations based on containers the story does not end with Docker containers. As a 5GC is not only based on one server and needs lots of redundancy, a management (orchestration) tool is required to manage containers across a large number of servers. There are several tools for this but it seems that Kubernetes is the tool of choice for most these days. I did a lot of reading about Kubernetes but the whole thing was still too abstract for me no matter how much I read about it. So I decided to get some hands-on experience myself. Here’s how I went about it in case you’d like to give it a go as well.