Services

In the training, we will learn about Services.

Navigate to the folder 11_service from CLI, before you get started.

Create and expose the application

Inspect deployment.yaml definition file and create the pod
```
cat deployment.yaml
kubectl create -f deployment.yaml
```
Inspect service-v1.yaml definition file and create the service
```
cat service-v1.yaml
kubectl create -f service-v1.yaml
```
Take a look at the created endpoints and IPs of the pods
```
kubectl get po,ep -o wide
```

Scale the deployment

kubectl scale deployment my-deployment --replicas 3

Take a look at the created Endpoints and IPs of the pods
```
kubectl get po,ep -o wide
```

Port forward the service port 80 to the local port 8080
```
kubectl port-forward service/my-service 8080:80
```
You can now access the service (in a seperate terminal)

curl http://127.0.0.1:8080

Inspect service-v2.yaml definition file and apply the changes to the service
```
cat service-v2.yaml
kubectl apply -f service-v2.yaml
```
Access the service

Get an EXTERNAL-IP of one of the nodes
```
kubectl get nodes -o wide
```
You can now access the service (or via web browser)
```
curl http://<EXTERNAL-IP>:30000
```

Inspect service-v3.yaml definition file and apply the changes to the service
```
cat service-v3.yaml
kubectl apply -f service-v3.yaml
```
Access the service

Get an EXTERNAL-IP of the service
```
kubectl get svc 
```
You can now access the service (or via web browser)
```
curl http://<EXTERNAL-IP>
```

Delete the resources - deployment and service.

kubectl delete deploy my-deployment
kubectl delete svc my-service