如何将configMap加载到环境变量中?

我做过的事

库伯内特斯 documentation 仅描述此场景,并遵循此场景:

我已经准备好了 configMap 通过这个地形:

resource "kubernetes_config_map" "production_database_host" {
  metadata {
    name = "production-database-host"
  }

  data {
    connection_name = "${google_sql_database_instance.master.connection_name}"
  }
}

apiVersion: v1
data:
  connection_name: this_string_is_redacted
kind: ConfigMap
metadata:
  creationTimestamp: 2018-10-12T05:49:49Z
  name: production-database-host
  namespace: default
  resourceVersion: "316273"
  selfLink: /api/v1/namespaces/default/configmaps/production-database-host
  uid: a1c06423-cde2-11e8-b615-42010a800235

(通过运行获取) kubectl get configmap production-database-host -o yaml )

env:
 - name: INSTANCE_CONNECTION_NAME
   valueFrom:
     configMapKeyRef:
       name: production-database-host
       key: connection_name

但是,应用此配置可以:

$ kubectl apply -f .

error: error converting YAML to JSON: yaml: line 39: did not find expected key

我做错什么了?为什么不直接加载 this_string_is_redacted 进入 INSTANCE_CONNECTION_NAME

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