ReplicaSet

A ReplicaSet guarantees that a certain number of pod replicas are running at all times. However, a Deployment is a more advanced concept that oversees ReplicaSets and offers declarative updates to Pods, along with many other valuable features. As a result, it's generally recommended to use Deployments rather than directly working with ReplicaSets, unless you need specific update control or don't need updates at all.

ReplicaSet Manifest File

replicaset.yaml

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: frontend
  labels:
    app: guestbook
    tier: frontend
spec:
  # modify replicas according to your case
  replicas: 3
  selector:
    matchLabels:
      tier: frontend
  template:
    metadata:
      labels:
        tier: frontend
    spec:
      containers:
      - name: php-redis
        image: us-docker.pkg.dev/google-samples/containers/gke/gb-frontend:v5

        

After make the manifest file, we apply the manifest to create deployment

kubectl apply -f replicaset.yaml

Then check the deployment

# Get pods
kubectl get rs -n [NAMESPACE]