How can a Pod know which availability zone it locates?

Question

Hi. I'm working with a StatefulSet in my AKS with 3 availability zones. In my scenario, each Pod has to know which zone it actually locates on and start the container with this config.
According to this doc (https://learn.microsoft.com/en-us/azure/aks/availability-zones#verify-node-distribution-across-zones), it seems I can only get the zone info from Pod's corresponding PV or AKS node. To achieve my goal, I think I have to call API server in an init-container to query zone info.
So is there any easier way to make zone info be accessible in the container or be set as env variables of PodSpec as

env:  
  - name: ZONE  
    valueFrom:  
      fieldRef:  
        fieldPath: status.zone  

Thanks in advance.

Answer 1

@Cheng Peng

As the nodes have zone labels, no need for init container.

You can use node affinity or/and taints and tolerations (taints and tolerations are optional if there no issues with other pods being scheduled on those nodes as well).

Check this document for information on scheduling a Pod using required node affinity.

Hope this helps.

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