timohirt/learning-kubernetes

Learning Kubernetes

This repository contains examples I used to learn more about Kubernetes. I use this repository to take notes and write about what I learnt and what might be useful to know about Kubernetes, its components and how to use it.

Disclaimer: As stated above, this repo is mainly for taking notes. It is not meant to be a complete reference.

Minikube

I primarily use Minikube on my MacBook. It is very easy to get a Kubernetes cluster up and running with VirtualBox.

$ minikube start --vm-driver=virtualbox

This command creates a VM and starts a sinlge node Kubernetes cluster.

Working with Swagger UI

Swagger UI is a great tool browse the API. Minikube can be configured to enable it in the Kubernetes cluster.

$ minikube start --extra-config=apiserver.enable-swagger-ui=true
kubectl proxy --port=8080

Now open your browser and navigate to http://localhost:8080/swagger-ui/.

Making Docker Images Available in Minikube

Currently, I don't push Docker images to a public repository. Instead I configure the docker command to use Docker on the Minicube VM to build an image.

$ eval $(minikube docker-env)

After running this command all docker images build are available in Minikube and can be used in pod specifications for example.

Open a Shell in a Docker Container

Sometimes it is useful to open a shell in a Docker container to test something. I use the shell-demo pod provided by the Kubernetes project.

$ kubectl create -f https://k8s.io/examples/application/shell-demo.yaml
$ kubectl exec -it shell-demo -- bash
root@shell-demo:/#