Microservices exercises // Kubernetes

kubectl 101

Let's start with some basic commands to see if kubectl is installed correctly and your setup is working so you can connecto to the Kubernetes cluster

1. Print the version of your kubectl installation
2. Print all nodes of the Kubernetes cluster
3. Print all Pods/Deployments/Services available in the default namespace

Everything can also be done with kube-prompt or click if you prefer that over the normal kubectl CLI.

If you're able to interact with the Kubernetes cluster you can continue with the following tasks:

1. Adapt the Busybox Pod file in manifets/kubectl-101/busybox.yaml to get a unique name for your Pod and deploy the Pod to the Kubernetes cluster
2. Use kubectl exec to get an interactiv bash session in the Kubernetes Pod
3. Check which services are available in the cluster and try to interfact with one of them (Hint: Prometheus might be a good idea as it has a web UI running on port 9090 and the busybox image includes wget)

Kubernetes resources 101

To get started with Kubernetes deployments we want to port the previous exercise to deploy a Redis server and the Redis-Commander web UI with Docker-Compose to a Kubernetes based deployment. The Docker-Compose file can be found at manifests/k8s-resources-101/redis-cmder-compose.yaml.

1. Start with the given 01-deployment.yaml to create a deployment of a single Redis server and a Redis-Commander in every pod
2. Validate with kubectl get pods that your deployment is running correctly
3. Connect to your Pod by using kubectl port-forward and try to access the web UI to create some keys in the Redis instance
4. Update the tiven 02-service.yaml to create a Service in Front of your Redis server.
5. Validate if your service is finding at least one Pod to redirect its traffic to
6. Create an Ingress resource with the subdomain *.mis.inf.fh-rosenheim.de (e.g. sINFmamust-redis-cmder.mis.inf.fh-rosenheim.de) and create an corresponding entry in your hosts file as there's unfortunately no DNS resolving the domain correctly. (the last step is already advanced stuff, talk to your lecturer before you start with this task!)