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Complete a minimal Deployment manifest for an app with 3 replicas and a container port.

Complete a minimal Deployment for a stateless web app.

Constraints: run 3 replicas; the container listens on port 8080; keep the selector and the Pod-template labels consistent. Do not add a Service or probes — just a valid Deployment.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
spec:
  replicas:        # ??? how many
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: nginx:1.27
          # declare the container port here

Fill in the replica count and the container port.

Set spec.replicas: 3 and add ports under the container with containerPort: 8080. The selector.matchLabels must match template.metadata.labels (app: web), or the Deployment adopts no Pods and the apply is rejected. apiVersion is apps/v1, kind is Deployment; the template is the Pod spec the ReplicaSet stamps out three times.

✗Selector labels not matching the template labels, so no Pods are managed
✗Putting containerPort or replicas at the wrong nesting level
✗Using kind: Pod / apiVersion: v1 instead of Deployment / apps/v1

→What does the API reject at apply time if the selector does not match the template labels?
→Why is containerPort informational rather than what actually exposes the app?

Solution

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
spec:
  replicas: 3
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: nginx:1.27
          ports:
            - containerPort: 8080

diverge, the apiserver rejects the object — the Deployment could adopt no Pods. containerPort is informational (it documents the port); a Service, not this field, is what actually routes traffic to the app.

replicas: 3 lives at the Deployment's spec level (not on the container).
The port is declared as a ports list with containerPort: 8080 inside the container.
selector.matchLabels (app: web) must equal template.metadata.labels. If they

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Complete a minimal Deployment manifest for an app with 3 replicas and a container port.

Complete a minimal Deployment for a stateless web app.

Constraints: run 3 replicas; the container listens on port 8080; keep the selector and the Pod-template labels consistent. Do not add a Service or probes — just a valid Deployment.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
spec:
  replicas:        # ??? how many
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: nginx:1.27
          # declare the container port here

Fill in the replica count and the container port.

Solution

apiVersion: apps/v1 kind: Deployment metadata: name: web spec: replicas: 3 selector: matchLabels: app: web template: metadata: labels: app: web spec: containers: - name: web image: nginx:1.27 ports: - containerPort: 8080

replicas: 3 lives at the Deployment's spec level (not on the container).

The port is declared as a ports list with containerPort: 8080 inside the container.

selector.matchLabels (app: web) must equal template.metadata.labels. If they