KCNA Cloud Native Architecture — All Questions With Answers

Refer to the exhibit.
```
apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
        livenessProbe:
          httpGet:
            path: /healthz
            port: 80
          initialDelaySeconds: 5
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 80
          initialDelaySeconds: 3
          periodSeconds: 5
```

Refer to the exhibit.
```
$ kubectl get pods -n production
NAME                      READY   STATUS    RESTARTS   AGE
api-7d4f8b8c6-abc12       1/1     Running   0          5m
api-7d4f8b8c6-xyz78       1/1     Running   0          5m
web-9f6c8d7e5-lmn34       1/1     Running   3          10m
web-9f6c8d7e5-pqr56       1/1     Running   0          10m
$ kubectl logs web-9f6c8d7e5-lmn34
Error: failed to connect to database at 10.0.0.1:3306
$ kubectl describe pod web-9f6c8d7e5-lmn34 | grep -A5 Events
Events:
  Type     Reason     Age   From               Message
  ----     ------     ----  ----               -------
  Warning  Unhealthy  2m    kubelet            Liveness probe failed: HTTP probe failed with statuscode: 503
  Normal   Killing    2m    kubelet            Container failed liveness probe, will be restarted
  Normal   Pulling    2m    kubelet            Pulling image "webapp:2.0"
```

Refer to the exhibit.
```
apiVersion: v1
kind: Pod
metadata:
  name: web-app
spec:
  containers:
  - name: app
    image: nginx:latest
    ports:
    - containerPort: 80
    livenessProbe:
      httpGet:
        path: /healthz
        port: 8080
      initialDelaySeconds: 3
      periodSeconds: 5
```