awenzelhuemer / fh-mc-cd-kubernetes

Exercise 5

Part 1

1. Install Minikube on your computer

minikube start

2. Open the minikube dashboard

minikube dashboard

Part 2

1. Run container in kubernetes

kubectl run demo --image=awenzelhuemer/myhello:latest --port=5000 --labels=app=demo

Result:

2. Verify that container started

kubectl get pods --selector app=demo

Result:

NAME   READY   STATUS    RESTARTS   AGE
demo   1/1     Running   0          3m25s

3. Forward local port 9999 to the container port 5000

kubectl port-forward demo 9999:5000

Result:

Forwarding from 127.0.0.1:9999 -> 8888
Forwarding from [::1]:9999 -> 8888
Handling connection for 9999

Application which runs on port 8888 gets redirect to local port 9999.

4. Delete the pod

kubectl delete pod demo

Result:

pod "demo" deleted

Part 3

1. Apply the deployment to your Kubernetes cluster

kubectl apply -f deployment.yml

Result:

deployment.apps/demo created

2. See active deployments

kubectl get deployments

Result:

 kubectl get deployments

3. Get more information on the demo deployment

kubectl describe deployment demo

Result:

Name:                   demo
Namespace:              default
CreationTimestamp:      Tue, 09 May 2023 13:44:11 +0200
Labels:                 <none>
Annotations:            deployment.kubernetes.io/revision: 1
Selector:               app=demo
Replicas:               1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:  app=demo
  Containers:
   demo:
    Image:        awenzelhuemer/myhello:latest
    Port:         80/TCP
    Host Port:    0/TCP
    Environment:  <none>
    Mounts:       <none>
  Volumes:        <none>
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  <none>
NewReplicaSet:   demo-57fd987b7b (1/1 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  25s   deployment-controller  Scaled up replica set demo-57fd987b7b to 1

4. Forward local port 9999 to the container port 8888

kubectl port-forward deployment/demo 9999:8888

Result:

5. Query the pods of your deployment with

kubectl get pods

Result:

NAME                    READY   STATUS    RESTARTS   AGE
demo-57fd987b7b-f98tw   1/1     Running   0          7m39s

6. Delete the pod

kubectl delete pod --selector app=demo

Result:

pod "demo-57fd987b7b-f98tw" deleted

7. Query again

kubectl get pods

Result:

Replica set is still running

NAME                    READY   STATUS    RESTARTS   AGE
demo-57fd987b7b-8ks2w   1/1     Running   0          59s

Part 4

1. Apply the service to your Kubernetes cluster

kubectl apply -f service.yml

Result:

service/demo created

2. Describe service

kubectl describe service demo

Result:

Name:                     demo
Namespace:                default
Labels:                   <none>
Annotations:              <none>
Selector:                 app=demo
Type:                     LoadBalancer
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.96.231.25
IPs:                      10.96.231.25
LoadBalancer Ingress:     127.0.0.1
Port:                     <unset>  80/TCP
TargetPort:               8888/TCP
NodePort:                 <unset>  32199/TCP
Endpoints:                10.244.0.9:8888
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

3. Start tunnel

minikube tunnel

✅  Tunnel erfolgreich gestartet

📌  ACHTUNG: Schließen Sie dieses Terminal nicht. Der Prozess muss am Laufen bleiben, damit die Tunnels zugreifbar sind ...

❗  Access to ports below 1024 may fail on Windows with OpenSSH clients older than v8.1. For more information, see: https://minikube.sigs.k8s.io/docs/handbook/accessing/#access-to-ports-1024-on-windows-requires-root-permission
🏃  Start Tunnel für den Service demo

4. Open application with LoadBalancer

Balancer Ingress: 127.0.0.1

Part 5

1. Apply namespace to your Kubernetes cluster

kubectl apply -f namespace.yml

Result:

namespace/demo-environment created

2. Query namespaces

kubectl get namespaces

Result:

NAME                   STATUS   AGE
default                Active   66m
demo-environment       Active   59s
kube-node-lease        Active   66m
kube-public            Active   66m
kube-system            Active   66m
kubernetes-dashboard   Active   65m

3. Apply deployment to namespace

apiVersion: apps/v1
kind: Deployment
metadata:
  name: demo
  namespace: demo-environment
spec:
    replicas: 1
    selector:
        matchLabels:
            app: demo
    template:
        metadata:
            labels:
                app: demo
        spec:
            containers:
            - name: demo
              image: awenzelhuemer/myhello:latest
              ports:
              - containerPort: 80

4. Apply the modified deployment

kubectl apply -f deployment.yml

5. Check resources in demo-environment

kubectl get deployments --namespace demo-environment

Result:

NAME   READY   UP-TO-DATE   AVAILABLE   AGE
demo   1/1     1            1           49s

kubectl get pods --namespace demo-environment

Result:

NAME                    READY   STATUS    RESTARTS   AGE
demo-57fd987b7b-hjj2f   1/1     Running   0          58s