Kubernetes JSON configMap not mounted-CodePudding

I am trying to map a configMap in JSON format to my docker image in Kubernetes I am using config npm package to fetch the configurations.

The idea is that I will have a file development.json in /config directory from there the config package will pick it up. This all works in localhost. The name of the config file is the same as the NODE_ENV variable, which I am also setting in the deployment.yaml

I am using default namespace

This is the beginning of the configMap (I can see it is created in google kubernetes)

I am running ls is the config directory to see if the development.json file has been mounted but it is not. I want the /config to be replaced and only contain the development.json file

I have also tried with the subPath parameter but same result

What am I doing wrong ? Should I see in the events that the configMap is mounted. There is no log of that except when I delete the configMap and try to do the mount, so I figure that the mounting is happening

apiVersion: v1
kind: ConfigMap
metadata:
  name: config-development
  namespace: default
data:
  development.json: |
    {
      "production": false,

Here is the mount:

volumes:
        - name: config-volume
          configMap:
            name: config-development
      containers:
        - name: salesforce-compare-api
          image: XXXX
          command: ["ls"]
          args: ["config", "-la"]
          imagePullPolicy: Always
          env:
          - name: NODE_ENV
            value: "development"
          volumeMounts:
          - name: config-volume
            mountPath: /config/development.json

CodePudding user response：

Usually, when the configmap cannot be mounted, the pod will not even start. So the fact that it started, shows that its mounted.

In any case, your volumeMounts looks problematic.

volumeMounts:
  - name: config-volume
    mountPath: /config/development.json

This lead to the full configmap being mounted into a folder named development.json, while you actually only want to mount the one file.

Use a subpath for this.

volumeMounts:
  - name: config-volume
    mountPath: /config/development.json
    subPath: development.json

That said, if you config folder inside the container is otherwise empty, you can also drop the subpath and mount the configmap to the /config dir, since it will not override anything important.

volumeMounts:
  - name: config-volume
    mountPath: /config