mipt-pdris/kubernetes_example

How to setup

0. Clean minikube machine if there are any, start new and assign context.

minikube delete
minikube start
kubectl config use-context minikube

Use minikube dashboard to see what happens with kubernetes in your browser. Note: in case of any troubles check #Troubleshoot section at the end of README

1. Create postgres pod, service and persistent volume with configuration postgres.yaml:
   kubectl create -f kube/postgres.yaml
2. Package application into jar:
   ./gradlew clean build
3. Create image of application:
   docker build -t docker-boot .
4. Create pod with deployment config for spring boot application with configuration sp-deployment.yaml:
   kubectl create -f kube/sp-deployment.yaml
5. Expose service for created deployment kube-boot: kubectl expose deployment kube-boot --type=LoadBalancer --port=8080
6. Get external url of kube-boot service: minikube service kube-boot --url
7. Copy url with port that you get on previous stage and insert it in browser. You should see Hello World! profile: prod

Troubleshoot

If your pod didn't start and stay in status ErrImagePull, then execute in terminal eval $(minikube docker-env) and rebuild docker-boot image and recreate pod (kubectl delete -f kube/postgres.yaml and kubectl create -f kube/postgres.yaml)

eval $(...) command will point your docker client to your machine's docker daemon. To undo that execute eval $(minikube docker-env -u).

To check logs of starting of your spring boot, get your pod name from your cluster(ex. kube-boot-697fdf6ff4-jb6qc) and execute command kubectl logs <YOUR_POD_NAME>