A Deployment

A Deployment manages a replicated set of Pods and recreates them if they crash. Instead of declaring a single Pod you declare a desired replica count and a Pod template; the Deployment controller ensures that many Pods always exist.

Remove the standalone Pod first

The standalone Pod from page 03 has the same name (web) as the Pods the Deployment will create. Delete it to avoid a name clash:

kubectl delete pod web

Create deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
spec:
  replicas: 2
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: nginx
          image: nginx:1.27
          ports:
            - containerPort: 80

Apply and verify

kubectl apply -f deployment.yaml
kubectl get pods -l app=web   # two managed pods, Running

Both Pods carry the label app: web — the selector the Service (next page) will use to find them.

Checkpoint: kubectl get pods -l app=web shows two Pods with status Running.

Next: 05 A Service