🚀 Deploy

A Deployment is the standard way to run an application on the cluster. You say which image to use and how many copies (replicas) you want, and Kubernetes creates the pods and keeps them running: if a pod goes down, it creates another.

Deployment  ->  ReplicaSet  ->  Pods

info

Deployment is done with kubectl. The Nuvion Panel takes care of the cluster, but does not create applications inside it.

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🚀 Before you start

• Have cluster access configured (see Cluster Access).

🚀 1. Create the Deployment file

Create the file deploy-web.yaml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-deploy
spec:
  replicas: 2
  selector:
    matchLabels:
      app: web-deploy
  template:
    metadata:
      labels:
        app: web-deploy
    spec:
      containers:
        - name: nginx
          image: nginx:1.26
          ports:
            - containerPort: 80
          resources:
            requests:
              cpu: 100m
              memory: 64Mi
            limits:
              cpu: 250m
              memory: 128Mi
          readinessProbe:
            httpGet:
              path: /
              port: 80

What each part does:

Field	Purpose
replicas	How many pods to keep running
image	The container image (and version)
requests	The minimum resources the pod needs
limits	The maximum resources the pod can use
readinessProbe	Only sends traffic to the pod after it responds

🚀 2. Apply

kubectl apply -f deploy-web.yaml

Expected output: deployment.apps/web-deploy created

🚀 3. Verify

kubectl get deployment web-deploy
kubectl get pods -l app=web-deploy

Wait for the READY column to show 2/2 and the pods to be Running.

🚀 4. See the automatic recreation

Delete one of the pods and watch:

kubectl delete pod NAME-OF-ONE-OF-THE-PODS
kubectl get pods -l app=web-deploy

Kubernetes creates a new pod to keep 2 replicas.

🚀 5. Expose the application

To access the Deployment, create a Service (see the Services page):

kubectl expose deployment web-deploy --name=web-deploy-svc --port=80

✅ How to know it worked

kubectl get deployment web-deploy shows READY 2/2 and AVAILABLE 2.

❗ Common problems

Symptom	Cause	Solution
READY 0/2	Pods did not start	See kubectl describe pod and Events
ImagePullBackOff	Image or version does not exist	Check the name and tag in image
selector does not match template labels	matchLabels differs from labels	Use the same label in both
Pods Pending	No resources on the nodes	Reduce requests or increase capacity (Scale)

🧹 Cleanup

Keep the Deployment for the next Operations pages. When you are done:

kubectl delete svc web-deploy-svc
kubectl delete deployment web-deploy

➡️ Next step: Scale

🧠 Questions?

Talk to our SaveinCloud technical support team!