如何在 k8s 的 configmap 中使用节点 ip

Question

I want to inject the value of k8s 'node ip' to a config map when a pod gets created. Any way how to do that?

Answer 1

A configmap is not bound to a host (multiple pods on different hosts can share the same configmap). But you can get details in a running pod. You can get the host IP the following way in an environment variable. Add the following in your pods spec section:

env:
- name: MY_NODE_IP
  valueFrom:
    fieldRef:
      fieldPath: status.hostIP

Details about passing other values to env vars can be found in the official documentation .

Unfortunately you can't get the hostIP in a volume, as the downwardAPI doesn't have access to status.hostIP ( docu )