ConfigMaps Not Found while Deploying an Application to Kubernetes Cluster - kubernetes

Question

I am trying to deploy an app to a Kubernetes cluster. My deployment uses three configMaps as volumeMounts.
However when I apply the deployment it can't seem to find the configMaps.
My deployment.yml looks like this:
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: dev-space
name: my-app-dev
spec:
replicas: 1
revisionHistoryLimit: 1
selector:
matchLabels:
name: my-app-dev
strategy:
rollingUpdate:
maxSurge: 100%
maxUnavailable: 30%
type: RollingUpdate
template:
metadata:
labels:
name: my-app-dev
version: v1
annotations:
sla: high
tier: application
role: frontend-api
quality: dev
spec:
containers:
- name: my-app
env:
- name: ENVIRONMENT
value: dev
- name: SAMPLE_FILE
value: sample.yml
- name: SAMPLE_FILE2
value: sample2.yml
image: my-app:1.0
ports:
- containerPort: 8000
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 9000
initialDelaySeconds: 11
timeoutSeconds: 3
readinessProbe:
httpGet:
path: /health
port: 9000
initialDelaySeconds: 11
timeoutSeconds: 3
volumeMounts:
- name: sample-volume
mountPath: /path
readOnly: true
- name: sample-volume1
mountPath: /path1
readOnly: true
- name: sample-volume2
mountPath: /path2
readOnly: true
nodeSelector:
tier: app
imagePullSecrets:
- name: img-secret
volumes:
- name: "sample-volume"
configMap:
name: "sample-volume-dev-my-app"
- name: "sample-volume1"
configMap:
name: "sample-volume1-dev-my-app"
- name: "sample-volume2"
configMap:
name: "sample-volume2-dev-my-app"
When I apply the deployment I get the following errors:
Warning FailedMount 4m (x6 over 5m) kubelet, server.org.local MountVolume.SetUp failed for volume "sample-volume" : configmaps "sample-volume-dev-my-app" not found
Warning FailedMount 4m (x6 over 5m) kubelet, server.org.local MountVolume.SetUp failed for volume "sample-volume1" : configmaps "sample-volume1-dev-my-app" not found
Warning FailedMount 4m (x6 over 5m) kubelet, server.org.local MountVolume.SetUp failed for volume "sample-volume2" : configmaps "sample-volume2-dev-my-app" not found
Is there something wrong with my configuration? What could be the issue?

Answer 1

You either have not created the config maps or you have created them in a different namespace than where you are deploying the application.
kubectl get cm -A
Above command will list all config maps in all namespaces. Check if a config map with name sample-volume-dev-my-app exists and in which namespace.