challenges.2.md

Kubernetes 101 Challenge

For scheduling applications consisting of multiple containers you typically use an orchestrator. Kubernetes is an orchestrator and in this chapter you will set up a Kubernetes cluster in Azure Kubernetes Services (AKS) and an Azure Container Registry (ACR) to store your images.

Here's what you'll learn:

• How to set up a Kubernetes Cluster with Azure Kubernetes Service
• How to access the cluster with the commandline command "kubectl"
• Get to know the basic command set of "kubectl"
• Understand the concept of pods and services and how they come together
• Get in touch with Yaml files to specify a desired state for a Kubernetes object

1. Create a Kubernetes cluster on Azure Kubernetes Service

• Set up your Kuberenetes cluster using Azure Kuberenetes Service.

Need help? Check hints here 📘!

The deployment will take some time (~20 min).

2. Run single container app in your K8s cluster

Need help? Check hints here 📘!

• Run a public available application in a single container on your cluster. The image name is "nginx".
  • Use the "kubectl run" command
• Add a service to make your application is accessible from the internet
  • Use the "kubectl expose" command and "kubectl edit YOURSERVICE" command.
• Start your webbrowser to view your application running in your cluster.

3. Kubernetes discovery

• Open the K8s portal for a graphical interface. Run kubectl proxythen open up a browser an navigate to http://localhost:8001/ui or http://localhost:8001/api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/#!/pod?namespace=default
• If you want to work with namespaces. Create your own namespace 'mynewnamespace' with

kubectl create ns mynewnamespace

and apply this postfix to your kubectl commands like

kubectl get pods -n mynewnamespace

• Familiarize yourself with the following commands on commandline, eg.

kubectl get pods    // to display all pods
kubectl get svc     // to display all services
kubectl get deployments     // to display all deployments
kubectl delete pods/<podid> // to delete a specific pod

4. Execute deployments via yaml

Need help? Check hints here 📘!

• Launch the nginx deployment via yaml file (see if you can download it somewhere?)
• Launch a custom image from your registry (learn about secrets)
• You can declare a namespace inside your yaml file