deployment.yml

apiVersion: apps/v1
kind:  Deployment
metadata: 
  name: deploy
  labels:
    app: depapp
spec:
    strategy:
      type: RollingUpdate
      rollingUpdate:
            maxSurge: 2   # Maximum number of pods that can be created over the desired replicas
            maxUnavailable: 2  # Maximum number of pods that can be unavailable during the update 
    selector: 
      matchExpressions:      
           #-  { key: app, operator: In , values: [replicasetapp,  new-app]}
           #-  { key: app, operator: Exists}
           #-  { key: app, operator: NotIn , values: [replicasetapp,  new-app]}
      matchLabels: 
            app: replicasetapp
    replicas: 10
    template:
        metadata: 
          labels:
              name: new-app
              app: replicasetapp  #replicasetapp1 change when using NotIn exp
        spec:
            containers: 
                - name: nginx 
                  image: nginx:latest
                  resources: 
                    requests:
                      cpu: "100m"
                      memory: "128Mi" 
                  ports: 
                      - containerPort: 80
                        name: http
                        protocol: TCP