将环境变量获取到 NGNIX react kubernetes pod

Question

I have an ngnix kubernetes pod that I need to pass an .env file to but I can't get it to work.

Docker file for the pod:

FROM node:12-alpine as build-step

RUN mkdir /app
WORKDIR /app
COPY package.json /app
RUN npm install
COPY . /app
RUN npm run build

FROM nginx:1.17.1-alpine
COPY --from=build-step /app/build /usr/share/nginx/html

I've tried with to pass the env with the configmap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-front-app
data:
  ENV_TEST: "TEST"

And with passing the env in the Deployment but neither worked.

edit the deployment file:

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: test-front-app
  name: test-front-app
spec:
  replicas: 2
  selector:
    matchLabels:
      name: test-front-app
  template:
    metadata:
      labels:
        name: test-front-app
    spec:
      imagePullSecrets:
        - name: gcr-json-key
      containers:
      - name: front-test
        image: gcr.io/PROJECT_ID/IMAGE:TAG
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        env:
          - name: TEST_ONE
            value: "test-value-one/"
        envFrom:
          - configMapRef:
              name: test-front-app

Answer 1

Your ConfigMap test-front-app key can be accessed as env like below.

    env:
    - name: TEST_ONE
      valueFrom:
        configMapKeyRef:
          name: test-front-app
          key: ENV_TEST

In this way TEST_ONE variable with value of TEST will be passed to deployment.