k8s-intro-talk

You can find here the slides and the sample code of my talk "Kubernetes, das unbekannte Wesen" that I presented on "Java Forum Nord" at 10th September 2024.

The chapter "Runbook" describes the demo steps.

Tools, that are used in the demo

• Docker CE
• Minikube
• kubectl

Runbook

Demonstration Container Build

./00-container-build.sh

Starting Minikube with two nodes

minikube start --nodes 2 --addons=ingress,dashboard
minikube dashboard

Create a simple pod

kubectl apply -f 01-pod.yaml   
kubectl get pods     
kubectl delete po spring-boot-demo                                       

Create a pod with probes

kubectl apply -f 02-pod-with-probes.yaml  
kubectl describe po spring-boot-demo
kubectl delete po spring-boot-demo                                       

Create Service and Pod

kubectl apply -f 03-pod-with-service.yaml          
kubectl get pods
kubectl get service 

kubectl run -it --rm --restart=Never busybox --image=gcr.io/google-containers/busybox sh
	wget http://srv.ip/hero -O - # srv.ip is the Cluster IP column by kubectl get service                       

Create Ingress

 kubectl apply -f 04-ingress.yaml
 minikube ip
 nano /etc/hosts

Create Config Map and Secrets

kubectl delete po spring-boot-demo 
kubectl apply -f 05-config-secret.yaml
kubectl get configmaps
kubectl get secrets
kubectl apply -f 06-pod-with-config.yaml

Create Namespace

kubectl apply -f 07-namespace.yaml
kubectl get namespaces
kubectl get pod --namespace spring-boot-demo-namespace

Create Deployment

kubectl delete ingress spring-demo-ingress
kubectl apply -f 08-deployment.yaml
kubectl delete deployments.apps --namespace spring-boot-demo-namespace spring-boot-demo-deploy

Create Job

kubectl apply -f 09-job.yaml
kubectl get pods -–watch
kubectl logs jobs/demo-job job 
kubectl delete job job-demo

Create Cron Job

kubectl apply -f 10-cronjob.yaml
kubectl get cronjobs --watch
kubectl get pods –watch
kubectl logs cronjob-demo
kubectl delete cronjobs cronjob-demo

Further Information

• Article about Container Image Build Tools (German)

More good talks to this topic

• From 0 to Kubernetes