Environmental variables returning undefined for Kubernetes deployment - node.js

Question

I posted a question similar to this and tried to implement what the answer for this question said: How to access Kubernetes container environment variables from Next.js application?
However, when I still call my environment variables doing process.env.USERNAME, I'm still getting undefined back... Am I doing something wrong in my deployment file? Here is a copy of my deployment.yaml:
metadata:
namespace: <namespace>
releaseName: <release name>
releaseVersion: 1.0.0
target: <target>
auth:
replicaCount: 1
image:
repository: '<name of repository is here>'
pullPolicy: <always>
container:
multiPorts:
- containerPort: 443
name: HTTPS
protocol: TCP
- containerPort: 80
name: HTTP
protocol: TCP
env:
- name: USERNAME
valueFrom:
secretKeyRef:
name: my-username
key: username
- name: PASSWORD
valueFrom:
secretKeyRef:
name: my-password
key: password
- name: HOST
valueFrom:
secretKeyRef:
name: my-host
key: host
volumeMounts:
- name: config
mountPath: "/configMap"
readOnly: true
volume:
- name: config
configMap:
name: environmental-variables
resources:
requests:
cpu: 0.25
memory: 256Mi
limits:
cpu: 1
memory: 1024Mi
variables:
- name: NODE_ENV
value: <node env value here>
ingress:
enabled: true
ingressType: <ingressType>
applicationType: <application type>
serviceEndpoint: <endpoint>
multiPaths:
- path: /
- HTTPS
tls:
enabled: true
secretName: <name>
autoscale:
enabled: false
minReplicas: 1
maxReplicas: 5
cpuAverageUtilization: 50
memoryUtilizationValue: 50
annotations:
ingress:
nginx.ingress.kubernetes.io/affinity: <affinity>
nginx.ingress.kubernetes.io/session-cookie-name: <cookie-name>
nginx.ingress.kubernetes.io/session-cookie-expires: <number>
nginx.ingress.kubernetes.io/session-cookie-max-age: <number>
I also created a configMap.yaml file, although I'm not sure if that's the right way to do this. Here is my configMap.yaml file:
apiVersion: v1
kind: ConfigMap
metadata:
name: environmental-variables
data:
.env: |
USERNAME: <username>
PASSWORD: <password>
HOST: <host>
Any help will be greatly appreciated! Also I'm trying to make my environment variable as Secrets since I don't want to expose any of my variables because it contains sensitive information. I am trying to do this on a Node.js application using Express. Thank you!
EDIT: Here is how the Secrets part looks like in my yaml file
secrets:
- name: environmental-variables
key: USERNAME
- name: environmental-variables
key: PASSWORD
How my Secrets yaml file looks like:
kind: Secret
apiVersion: v1
metadata:
name: environmental-variables
namespace: tda-dev-duck-dev
data:
USERNAME: <username>
PASSWORD: <password>

Answer 1

After days of figuring out how to use Secrets as an environmental variable, I figured out how to reference it in my nodejs application!
Before I was doing the normal way of calling environmental variables, process.env.VARIABLE_NAME, but that did not work for me when I had Secrets as an environment variable. In order to get the value of the variable, I had to do process.env.ENVIRONMENTAL_VARIABLES_USERNAME in my Javascript file and that worked for me! Where ENVIRONMENTAL_VARIABLES is the name and USERNAME is the key!
Not sure if this will help anyone else but this is how I managed to access my Secrets in my nodejs application!

Answer 2

You created ConfigMap and trying to get value from secret. If you want set value from configmap then update env like following
env:
- name: USERNAME
valueFrom:
configMapKeyRef:
name: environmental-variables # this is ConfigMap Name
key: USERNAME # this is key in ConfigMap
- name: PASSWORD
valueFrom:
configMapKeyRef:
name: environmental-variables
key: PASSWORD
- name: HOST
valueFrom:
configMapKeyRef:
name: environmental-variables
key: HOST
and update the configmap like following
apiVersion: v1
kind: ConfigMap
metadata:
name: environmental-variables
data:
USERNAME: <username>
PASSWORD: <password>
HOST: <host>
To learn how to define container environment variables using ConfigMap data click here
If you want to use secrets as environment variables check here