Auto Rolling Restart K8 pods when change in ConfigMap through Stakater Reloader

Stakater Reloader Setup

helm repo add stakater https://stakater.github.io/stakater-charts
helm repo update
helm install stakater/reloader --generate-name

Create a helm chart with Deployment with ConfigMap:

test-config-change
 |-values.yaml
 |-Chart.yaml
 |-templates
 |  |-configmap.yaml
 |  |-deployment.yaml

Sample Deployment file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: test-config-change
  annotations:
    reloader.stakater.com/search: "true"
spec:
  replicas: 2
  selector:
    matchLabels:
      app.kubernetes.io/name: nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: nginx
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - name: config-volume
          mountPath: /etc/nginx/conf.d/
      volumes:
        - name: config-volume
          configMap:
            name: nginx-cm

Sample ConfigMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-cm
  annotations:
    reloader.stakater.com/match: "true"
data:
  data-1: value-1
  data-2: value-2

Deploy helm chart

helm install test-config-change test-config-change -n <namespace>

List the pods

kubectl get pods -n <namespace>
test-config-change-587b5cdb9d-12345     1/1  Running    0    1h
test-config-change-587b5cdb9d-23456     1/1  Running    0    1h

List Configmap

kubectl get configmaps -n <namespace>
NAME          DATA   AGE
nginx-cm      2      1h

Edit ConfigMap and Update Data:

kubectl edit configmap nginx-cm -n <namespace>
data:
  data-1: value-5
  data-2: value-6

List the pods again:

kubectl get pods -n <namespace>
test-config-change-5ffb46996-dks6g   1/1    Running    0       12s
test-config-change-5ffb46996-th7c4   1/1    Running    0       14s