How to merge two configmaps using volume mount in kubernetes

Question

I am having two different config maps test-configmap and common-config. I tried to mount them at the same location, but one config map over

Answer 1

NOTE: This approach is good if you have less amount of data in configmaps

Let's say you have two configmaps

test-confimap

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-configmap
data:
  test-1.conf: |
    test-property-1=test-value-1

common-confimap

apiVersion: v1
kind: ConfigMap
metadata:
  name: common-configmap
data:
  common-1.conf: |
    common-property-1=common-value-1

Instead of having different configmaps you can have same data in single configmap like below.

apiVersion: v1
kind: ConfigMap
metadata:
  name: single-configmap
data:
  common-1.conf: |
    property-1=value-1
  test-1.conf: |
    property-1=value-1

Now create a volume from above configmap and mount to container with mounhPath like below

volume from configmap

volumes:
- configMap:
    defaultMode: 420
    name: single-cofigmap
  name: my-single-config

volumeMount

volumeMounts:
- mountPath: /path/to/config/folder/
  name: my-single-config

Now you can see two files at the /path/to/config/folder/ location inside the container. Tell to your application to use which one it need.