As you may have noticed, when we are using the rollingUpdate strategy (which is the default) we will have, for a period of time, both versions of our application (v1 and v2) running in parallel. If we don’t want that to happen for any reason, we can configure the Deployments with a different strategy called Recreate: 

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apiVersion: apps/v1

kind: Deployment

metadata:

  name: hellok8s2

spec:

  strategy:

    type: Recreate

  replicas: 3

  selector:

    matchLabels:

      app: hellok8s

  template:

    metadata:

      labels:

        app: hellok8s

    spec:

      containers:

      - image: brianstorti/hellok8s:v2

        name: hellok8s-container