Affinity

On the containers we can specify the affinity as row e.g. like that:

    affinity:
      nodeAffinity:
        preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 1
            preference:
              matchExpressions:
                - key: disktype
                  operator: In
                  values:
                    - ssd

But this will be no easy to don't that two pods of the deployment not on the same node, for that, you can use:

affinity:
  podAntiAffinity:
    topologyKey: kubernetes.io/hostname

And if you want to use your own labels:

affinity:
  podAntiAffinity:
    labelSelector:
        k1: v1