How to share .sock file between nginx docker and uwsgi docker?

Question

I'm using docker-compose and now have two docker containers - one is a nginx webserver, whereas the other one is ubuntu with Python uwsgi and Flask.

As I know, the best way to connect nginx and uWSGI is done by sharing a *.sock file between them and pass the requests into the file (And that what I do in older projects where I did not use dockers).

I'm wondering how can I share the sock file between the dockers in order to enable the communication between them?

And at all.. I'm wondering if this scenario of two containers - one for nginx and one for the Flask framework and uWSGI - is best practice and right to do.

Thanks

Answer 1

You don't need to share the sock file with different docker container.

The simple solution is share the socket port between dockers.

In the uwsgi file need to add socket=:3000.

[uwsgi]

master=true
chdir=.
module=flaskapp

harakiri=60

callable=app
thunder-lock=true
socket=:3000
workers=12
threads=4
chmod-socket=666
vacuum=true
die-on-term=true
pidfile=uwsgi.pid

max-requests=5000

post-buffering=65536
post-buffering-bufsize=524288

the define the nginx conf. the uwsgi_pass section flask:3000 means (docker server name):(docker expose port).

server {
    listen 80;

    charset     utf-8;
    client_max_body_size 20M;

    location / {
        try_files $uri @slack;
    }

    location @slack {
        include uwsgi_params;
        uwsgi_pass flask:3000;
        uwsgi_read_timeout 60s;
        uwsgi_send_timeout 60s;
        uwsgi_connect_timeout 60s;
    }
}

In docker-compose file:

nginx:
    container_name: nginx
    build:
      context: .
      dockerfile: ./Dockerfile-Nginx
    ports:
      - "80:80"
    depends_on:
      - flask

flask:
    tty: true
    container_name: flask
    build:
      context: .
      dockerfile: ./Dockerfile
    expose:
      - "3000"

    command: uwsgi --ini ./uwsgi.ini

So just let the docker run one process for each docker container.