- To create a basic nginx deployment with 2 replicas, save this file as
nginx-deployment.yaml
using your text editor
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
selector:
matchLabels:
app: nginx
replicas: 2
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
- Run the apply command to perform the changes in cluster
kubectl apply -f nginx-deployment.yaml
- Get the pods related to this deployment
kubectl get pods --selector app=nginx
- Update the deployment file with
replicas
to 3 in nginx-deployment.yaml
using your text editor
...
replicas: 3
...
kubectl apply -f nginx-deployment.yaml
kubectl get pods --selector app=nginx
- Expose a service within the cluster
- Create a file
nginx-service.yml
with the following content
apiVersion: v1
kind: Service
metadata:
name: nginx-deployment
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: nginx
type: ClusterIP
- Create the service in the cluster
kubectl apply -f nginx-service.yml
- Start a
port-foward
to access in-cluster service
kubectl port-forward svc/nginx-deployment 8888:80
- From another terminal, access the service through the port forward
curl http://localhost:8888/
kubectl delete -f nginx-deployment.yaml
kubectl delete -f nginx-service.yml