Kubernetes - How to define ConfigMap built using a file in a yaml?

Question

At present I am creating a configmap from the file config.json by executing:

kubectl create configmap jksconfig --from-file=config.json

I would want the ConfigMap to be created as part of the deployment and tried to do this:

apiVersion: v1
kind: ConfigMap
metadata:
  name: jksconfig
data:
  config.json: |-
    {{ .Files.Get "config.json" | indent 4 }}

But doesn't seem to work. What should be going into configmap.yaml so that the same configmap is created?

---UPDATE---

when I do a helm install dry run:

# Source: mychartv2/templates/jks-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: jksconfig
data:
  config.json: |

Note: I am using minikube as my kubernetes cluster

Answer 1

Here is an example of a ConfigMap that is attached to a Deployment:

ConfigMap:

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: jksconfig
data:
  config.json: |-
{{ .Files.Get "config.json" | indent 4 }}

Deployment:

---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: jksapp
  labels:
    app: jksapp
spec:
  selector:
    matchLabels:
      app: jksapp
  template:
    metadata:
      labels:
        app: jksapp
      containers:
        - name: jksapp
          image: jksapp:1.0.0
          ports:
            - containerPort: 8080
          volumeMounts:
            - name: config #The name(key) value must match pod volumes name(key) value 
              mountPath: /path/to/config.json
      volumes:
        - name: config
          configMap:
            name: jksconfig

Answer 2

Soln 01:

• insert your config.json file content into a template
• then use this template into your data against config.json
• then run $ helm install command

finally,

{{define "config"}}
{
    "a": "A",
    "b": {
        "b1": 1
    }
}
{{end}}

apiVersion: v1
kind: ConfigMap
metadata:
  name: jksconfig
  labels:
    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
    app: "my-app"
    heritage: "{{ .Release.Service }}"
    release: "{{ .Release.Name }}"
data:
  config.json: {{ (include "config" .) | trim | quote }}