Poor Man's Microservice Configuration Using Environment Variables

demoservice-starter.sh

#!/usr/bin/env bash                                                                           
set -ae   # auto export env vars + stop script on error                                                                                 
                                                                                               
trap 'kill $PID' TERM                                                                          
                                                                                               
source $1                                                                                      
gunicorn demoservice:app &   # put your microservice start command here                                                                   
PID=$!                                                                                         
wait $PID

demoservice.cfg

PORT=8080                                                                                      
LOGLEVEL=info                                                                                  
DESCRIPTION=\                                                                                  
"This is                                                                                       
a multi line                                                                                   
description."

demoservice.py

import os                                                                                      
from flask import Flask                                                                        
app = Flask(__name__)                                                                          

@app.route("/")                                                                                
def hello():
    port = os.getenv("PORT")
    loglevel = os.getenv("LOGLEVEL")
    description = os.getenv("DESCRIPTION")
    return f"loglevel: {loglevel}, port: {port}, description: {description}"