ConfigMaps and Secrets with Kubernetes

Dockerfile

# Copyright 2017, Google, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
FROM node:6-onbuild
EXPOSE 3000
ENV LANGUAGE English
ENV API_KEY 123-456-789

embededenv.yaml

# Copyright 2017, Google, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: envtest
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: envtest
    spec:
      containers:
      - name: envtest
        image: gcr.io/<PROJECT_ID>/envtest
        ports:
        - containerPort: 3000
        env:
        - name: LANGUAGE
          value: "English"
        - name: API_KEY
          value: "123-456-789"
        
        

envvars.js

// Copyright 2017, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License")
var http = require('http');
var server = http.createServer(function (request, response) {
  const language = process.env.LANGUAGE;
  const API_KEY = process.env.API_KEY;
  response.write(`Language: ${language}\n`);
  response.write(`API Key: ${API_KEY}\n`);
  response.end(`\n`);
});
server.listen(3000);

file.js

// Copyright 2017, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License")
var http = require('http');
var fs = require('fs');
var server = http.createServer(function (request, response) {
  fs.readFile('./config/config.json', function (err, config) {
    if (err) return console.log(err);
    const language = JSON.parse(config).LANGUAGE;
    fs.readFile('./secret/secret.json', function (err, secret) {
      if (err) return console.log(err);
      const API_KEY = JSON.parse(secret).API_KEY;
      response.write(`Language: ${language}\n`);
      response.write(`API Key: ${API_KEY}\n`);
      response.end(`\n`);
    });
  });
});
server.listen(3000);

file.yaml

# Copyright 2017, Google, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: envtest
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: envtest
    spec:
      containers:
      - name: envtest
        image: gcr.io/smart-spark-93622/envtest:file5
        ports:
        - containerPort: 3000
        volumeMounts:
          - name: my-config
            mountPath: /usr/src/app/config
          - name: my-secret
            mountPath: /usr/src/app/secret
      volumes:
      - name: my-config
        configMap:
          name: my-config
      - name: my-secret
        secret:
          secretName: my-secret

final.yaml

# Copyright 2017, Google, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: envtest
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: envtest
    spec:
      containers:
      - name: envtest
        image: gcr.io/<PROJECT_ID>/envtest
        ports:
        - containerPort: 3000
        env:
        - name: LANGUAGE
          valueFrom:
            configMapKeyRef:
              name: language
              key: LANGUAGE
        - name: API_KEY
          valueFrom:
            secretKeyRef:
              name: apikey
              key: API_KEY

hardcode.js

// Copyright 2017, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License")
var http = require('http');
var server = http.createServer(function (request, response) {
  const language = 'English';
  const API_KEY = '123-456-789';
  response.write(`Language: ${language}\n`);
  response.write(`API Key: ${API_KEY}\n`);
  response.end(`\n`);
});
server.listen(3000);