Scaling Nginx servers via Docker' (a Flask app)

.gitignore

**/__pycache__/*

README.md

How to use

• in one terminal

git clone $url docker-scaling
cd docker-scaling
docker-compose up --scale flask=5

• in another terminal

for i in `seq 1 200`; do curl localhost:2000; done

app.py

import socket
from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hello, My container is named: " + socket.gethostname()

docker-compose.yml

version: '3'
services:
  flask:
    image: myflask
    build:
      context: .
      dockerfile: Dockerfile.flask
    volumes:
      - ./:/src
    expose:
      - "5000"
    environment:
      - FLASK_APP=/src/app.py
  nginx:
    image: mynginx
    build:
      context: .
      dockerfile: Dockerfile.nginx
    ports:
      - "2000:80"
    volumes:
      - ${PWD}:/var/www-data/
      - ./:/etc/nginx/conf.d
    depends_on:
      - flask

Dockerfile.flask

FROM python:3
RUN pip3 install flask
CMD flask run --host=0.0.0.0

Dockerfile.nginx

# using Nginx base image
FROM nginx
# delete nginx default .conf file
RUN rm /etc/nginx/conf.d/default.conf
# add the .conf file we have created
COPY nginx.conf /etc/nginx/nginx.conf

nginx.conf

events {}

http {
  
  upstream serv {
    server docker-scaling_flask_1:5000;
    server docker-scaling_flask_2:5000;
    server docker-scaling_flask_3:5000;
    server docker-scaling_flask_4:5000;
    server docker-scaling_flask_5:5000;
  }

  server {
    listen 80;
    location / {
      proxy_pass http://serv;
    }
    location /static/ {
      alias /var/www-data/;
    }
  }

}

parrot.gif

https://www.digitalocean.com/community/tutorials/how-to-set-up-password-authentication-with-nginx-on-ubuntu-14-04
simple auth with nginx

Dockerfile

COPY nginx.conf /etc/nginx/nginx.conf
COPY .htpasswd /etc/nginx/.htpasswd
RUN chmod 777 /etc/nginx/.htpasswd

nginx.conf

events {}

http {
    upstream serv {
        server flask:5000;
    }
    server {
        listen 80;
        location / {
	    auth_basic "hello";
            auth_basic_user_file .htpasswd;
            proxy_pass http://serv;
        }
    }
}

.htpasswd

echo -n 'myusername:' >> .htpasswd
openssl passwd -apr1 >> .htpasswd