My droplet configuration:
OS: Ubuntu 18.04.3 (LTS) x64
CPU: 4 core
RAM : 8GB
SSD: 80GB

On droplet, installed gitlab, docker, docker-compose.
Deployed Django, Gunicorn, NGINX, Postgresql using Docker and GitLab CI/CD on DO droplet.

Below are configuration files:

nginx.conf

upstream keev {
    server web:8000;
}

server {

    listen 80;

    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_redirect off;

        <^>proxy_connect_timeout   120;
        proxy_send_timeout      120;
        proxy_read_timeout      120;
        send_timeout            120;
        client_body_timeout     120;<^>

        proxy_pass http://keev;
    }
    location /staticfiles/ {
        alias /home/app/web/staticfiles/;
    }

    location /mediafiles/ {
        alias /home/app/web/mediafiles/;
    }
    proxy_connect_timeout   120;
    proxy_send_timeout      120;
    proxy_read_timeout      120;
    send_timeout            120;
    client_body_timeout     120;
}

docker-compose-prod.yml

version: '3.7'

services:

  # Redis
  redis:
    image: redis:5.0-alpine

  db:
    image: postgres:12-alpine
    env_file:
      - .env

  web:
    image: "${WEB_IMAGE}"
    expose:
      - "8000"
    volumes:
      - ./app:/app
      - static_volume:/home/app/web/staticfiles
      - media_volume:/home/app/web/mediafiles
    command: sh -c "python manage.py wait_for_db &&
                    python manage.py migrate &&
                    python manage.py collectstatic --no-input --clear &&
                    gunicorn keev.wsgi:application --workers 8 --threads 8 -t 120 --bind 0.0.0.0:8000"
    env_file:
      - .env
    depends_on:
      - db
      - redis


  nginx:
    image: "${NGINX_IMAGE}"
    ports:
      - "8001:80"
    volumes:
      - static_volume:/home/app/web/staticfiles
      - media_volume:/home/app/web/mediafiles
    depends_on:
      - web
    links: 
      - web
    restart: on-failure

volumes:
  static_volume:
  media_volume:

Dockerfile

FROM python:3.7-alpine

# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# some packages install needed
...
...
...
COPY ./requirements.txt /requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

# Setup directory structure
RUN mkdir -p /app
ENV APP_HOME=/app

RUN mkdir APP_HOME
RUN mkdir $APP_HOME/staticfiles
RUN mkdir $APP_HOME/mediafiles
WORKDIR $APP_HOME

COPY /app $APP_HOME

Dockerfile is correctly configured.

By using Gitlab CI/CD build container image and pulled on droplet and run it.

The thing is that my some request need more than 1 minute to process in my Django project. And I have already figure it out that how to increase the request timeout to 2 minutes from gunicorn and nginx but it worked on local system.

gunicorn
gunicorn keev.wsgi:application --workers 8 --threads 8 -t 120 --bind 0.0.0.0:8000

nginx

    proxy_connect_timeout   120;
    proxy_send_timeout      120;
    proxy_read_timeout      120;
    send_timeout            120;
    client_body_timeout     120;

But when it deployed to droplet it didn’t work, it gives response 504 Gateway timeout after request take longer than 1 minute to process. Don’t know how it goes wrong on server. Read lot of articles and post regarding docker, nginx, django and gateway timeout.

Please need help for this, kind of stuck for this.

Thanks for helping me.