Deploy your first app (Deployment + Service)

Steps

STEP 1 OF 5

Create a namespace: kubectl create namespace demo

Manifest

app.yaml

YAML

1apiVersion: apps/v1

2kind: Deployment

3metadata:

4 name: web

5 labels: { app: web }

6spec:

7 replicas: 3

8 selector:

9 matchLabels: { app: web }

10 template:

11 metadata:

12 labels: { app: web }

13 spec:

14 containers:

15 - name: web

16 image: nginx:1.27

17 ports: [{ containerPort: 80 }]

18 resources:

19 requests: { cpu: 100m, memory: 128Mi }

20 limits: { memory: 256Mi }

21 readinessProbe:

22 httpGet: { path: /, port: 80 }

23 livenessProbe:

24 httpGet: { path: /, port: 80 }

25 initialDelaySeconds: 10

26---

27apiVersion: v1

28kind: Service

29metadata:

30 name: web

31spec:

32 selector: { app: web }

33 ports: [{ port: 80, targetPort: 80 }]

Commands

Apply and test

SHELL

1kubectl create namespace demo

2kubectl apply -f app.yaml -n demo

3kubectl rollout status deploy/web -n demo

4kubectl get pods,svc -n demo -o wide

5kubectl port-forward svc/web 8080:80 -n demo

Tip

Inside the cluster the app is reachable at http://web.demo.svc.cluster.local, or just http://web from the same namespace. The Service selector must match the pod labels exactly.