Application development with Docker + Python + Flask

Last time: Dockerize using the project created in Connect to MySQL using Flask SQLAlchemy.

Dockerize

file organization

├── api
├── app.py
├── config.py
|
├── requirements.txt
├── Dockerfile
└── docker-compose.yaml

requirements.txt

flask
SQLAlchemy
Flask-SQLAlchemy
PyMySQL

In requirements.txt, write the modules that need to be installed.

FROM python:3.8-alpine

ADD requirements.txt /var/www/html/tool/
WORKDIR /var/www/html/tool
RUN pip3 install -r requirements.txt

docker-compose.yaml

version: '3'
services:
  api:
    build: .
    container_name: tool-api
    volumes:
      - ~/path/tool-api:/var/www/html/api
    ports:
      - 5000:5000
    tty: true
    command: flask run --host 0.0.0.0 --port 5000
    external_links:
      - "db:db"

networks:
  default:
    external:
      name: db_default

This time I'm connecting to mysql in another container.

Run

$ docker-compose up

Static file

file organization

├── api
├── app.py
├── config.py
├── requirements.txt
├── Dockerfile
├── docker-compose.yaml
|
├── nginx
|   ├── Dockerfile
|   └── nginx.conf
└── statics
    └── css
        └── sample.css

Create nginx docker file

/nginx/Dockerfile

FROM nginx
CMD ["nginx", "-g", "daemon off;", "-c", "/etc/nginx/nginx.conf"]

nginx.conf

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;

    keepalive_timeout  75;

    upstream flask_server {
        server tool-api:5000 fail_timeout=0;
    }

    #Server settings
    server {
        location /statics/ {
            alias /var/www/;
        }
        
        location / {
            try_files $uri @proxy_to_api;
        }
        
        location @proxy_to_api {
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_redirect off;
            proxy_pass http://flask_server;
        }
    }
}

Accessing / statics will cause nginx to go to the/ var / www /file.

Fixed docker-compose file

docker-compose.yaml

version: '3'
services:
  nginx:
    build: ./nginx
    container_name: tool-nginx
    volumes:
      - ./statics/:/var/www/
      - ./nginx/nginx.conf:/etc/nginx/nginx.conf
    ports:
      - 80:80
    depends_on: 
      - tool-api
  api:
    build: .
    container_name: tool-api
    volumes:
      - ~/path/tool-api:/var/www/html/api
    ports:
      - 5000:5000
    tty: true
    command: flask run --host 0.0.0.0 --port 5000
    external_links:
      - "db:db"

networks:
  default:
    external:
      name: db_default

Run

$ docker-compose up