What is Kubernetes pod affinity and how does it work?

What is Kubernetes pod affinity and how does it work?

Kubernetes pod affinity is a set of rules that allow you to specify how pods should be placed relative to each other. It helps in co-locating pods on the same node or in the same zone based on certain criteria.

Can you give me an example of how to configure pod affinity?

Sure! You can configure pod affinity in your pod specification using the affinity field. For example:

affinity:
  podAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      labelSelector:
        matchExpressions:
          - key: app
            operator: In
            values:
              - my-app
      topologyKey: "kubernetes.io/hostname"

What are the benefits of using pod affinity?

The benefits include improved performance due to reduced latency between pods, better resource utilization, and enhanced fault tolerance by ensuring related pods are scheduled together.

Are there any limitations to pod affinity?

Yes, some limitations include potential scheduling issues if there are not enough nodes that meet the affinity rules, and it can lead to uneven resource distribution if not managed properly.