ConfigMaps and Secrets with Kubernetes

Dockerfile

FROM python:3.6.4

# 设置工作目录
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
# 安装依赖
RUN pip install flask
# 添加应用
ADD . /usr/src/app

# 设置环境变量
ENV TOKEN abcdefg0000
ENV LANGUAGE English

# 暴露端口
EXPOSE 5000
# 运行服务
CMD python read-env-app.py

final-read-env.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: envtest
  labels:
    name: envtest
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: envtest
    spec:
      containers:
      - name: envtest
        image: cnych/envtest
        ports:
        - containerPort: 5000
        env:
        - name: TOKEN
          valueFrom:
            secretKeyRef:
              name: token
              key: TOKEN
        - name: LANGUAGE
          valueFrom:
            configMapKeyRef:
              name: language
              key: LANGUAGE

hardcode-app.py

# -*- coding: utf-8 -*-
from flask import Flask, jsonify
app = Flask(__name__)


@app.route("/")
def index():
    TOKEN = 'abcdefg123456'
    LANGUAGE = 'English'
    return jsonify(token=TOKEN, lang=LANGUAGE)


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

read-env-app.py

# -*- coding: utf-8 -*-
import os
from flask import Flask, jsonify
app = Flask(__name__)


@app.route("/")
def index():
    TOKEN = os.getenv('TOKEN', '')
    LANGUAGE = 'English'
    return jsonify(token=TOKEN, lang=LANGUAGE)


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

read-env.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: envtest
  labels:
    name: envtest
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: envtest
    spec:
      containers:
      - name: envtest
        image: cnych/envtest
        ports:
        - containerPort: 5000
        env:
        - name: TOKEN
          value: "abcd123456"
        - name: LANGUAGE
          value: "English"