grpc-xds/k8s/envoy/components/node-labels/patch-node-labels-init.yaml

# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Patch to query node labels from the API server and store them in files.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: envoy
spec:
  template:
    spec:
      automountServiceAccountToken: true # Need to communicate with the Kubernetes API server.
      initContainers:
      - name: node-labels-init
        image: kubectl
        command:
        - /bin/sh
        - -c
        - |
          #
          # Query the Kubernetes API server for the zone label on the node:
          #
          kubectl get nodes $NODE_NAME --output go-template='{{index .metadata.labels "topology.kubernetes.io/zone"}}' > /etc/nodeinfo/zone
        env:
        - name: NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath:
                spec.nodeName
        resources:
          requests:
            cpu: 10m
            memory: 100Mi
        volumeMounts:
        - name: nodeinfo
          mountPath: /etc/nodeinfo
      volumes:
      - name: nodeinfo
        emptyDir: {}