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

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

Your config.json file should be inside your mychart/ directory, not inside mychart/templates
Chart Template Guide
configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: {{ .Release.Name }}-configmap
data:
config.json: |-
{{ .Files.Get "config.json" | indent 4}}
config.json
{
"val": "key"
}
helm install --dry-run --debug mychart
[debug] Created tunnel using local port: '52091'
[debug] SERVER: "127.0.0.1:52091"
...
NAME: dining-saola
REVISION: 1
RELEASED: Fri Nov 23 15:06:17 2018
CHART: mychart-0.1.0
USER-SUPPLIED VALUES:
{}
...
---
# Source: mychart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: dining-saola-configmap
data:
config.json: |-
{
"val": "key"
}
EDIT:
But I want it the values in the config.json file to be taken from values.yaml. Is that possible?
configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: {{ .Release.Name }}-configmap
data:
config.json: |-
{
{{- range $key, $val := .Values.json }}
{{ $key | quote | indent 6}}: {{ $val | quote }}
{{- end}}
}
values.yaml
json:
key1: val1
key2: val2
key3: val3
helm install --dry-run --debug mychart
# Source: mychart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: mangy-hare-configmap
data:
config.json: |-
{
"key1": "val1"
"key2": "val2"
"key3": "val3"
}

Answer 2

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 3

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 }}