kubernetes: How to create and use configmap from multiple files

kubernetes configmap
Vikas Rathore picture Vikas Rathore · Feb 12, 2019 · Viewed 15.4k times · Source

I have the documentation regarding the configmap:

https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#define-container-environment-variables-using-configmap-data

From what I understand is I can create a config map(game-config-2) from two files (game.properties and ui.properties) using 

kubectl create configmap game-config-2 --from-file=configure-pod-container/configmap/kubectl/game.properties --from-file=configure-pod-container/configmap/kubectl/ui.properties

Now I see the configmap 

kubectl describe configmaps game-config-2
Name:           game-config-2
Namespace:      default
Labels:         <none>
Annotations:    <none>

Data
====
game.properties:        158 bytes
ui.properties:          83 bytes

How can I use that configmap? I tried this way:

    envFrom:
    - configMapRef:
        name: game-config-2

But this is not working, the env variable is not picking from the configmap. Or can I have two configMapRef under envFrom?

Answer

Ivan Aracki picture Ivan Aracki · Feb 12, 2019

One solution to this problem is to create a ConfigMap with a multiple data key/values:

apiVersion: v1
kind: ConfigMap
metadata:
  name: conf
data:
  game.properties: |
    <paste file content here>
  ui.properties: |
    <paste file content here>

Just don't forget | symbol before pasting content of files.

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