Connect postgres(psycopg2) with the main.py

I tried to connect postgres db from main.py, but its giving OperationalError: received invalid response to SSL negotiation: H. This issue is because the port 5432 is not properly exposed.

DOCKERFILE

FROM tiangolo/uwsgi-nginx-flask:python2.7
ENV LISTEN_PORT 5432
EXPOSE 5432
COPY tmp.conf /etc/nginx/conf.d/tmp.conf
COPY ./app /app
RUN pip install -r /app/requirements.txt

main.py

from flask import Flask
import psycopg2
app = Flask(__name__)

@app.route("/")
def hello():
    db = psycopg2.connect(host='127.0.0.1', port=5432, user='postgres',
                          password='123', dbname='chatbotdev')
    return "Hello World from Flask"

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=80)

tmp.conf

server {
    listen 8080 default_server;
    listen [::]:8080 default_server;

    location / {
      try_files $uri @app;
    }

    location @app {
        include uwsgi_params;
        uwsgi_pass unix:/tmp/uwsgi.sock;
    }
}

requirements.txt psycopg2==2.7.3.1

Can someone please explain, how can I use postgres within this docker container, because I’m able to do this in other linux docker containers.

[tiangolo]

@anubhav3itb you shouldn’t connect to the Postgres DB with localhost but with the name of the Postgres container.

So, the section:

    db = psycopg2.connect(host='localhost', port=5432, user='postgres',
                              password='123', dbname='chatbotdev')

Should be:

    db = psycopg2.connect(host='postgres', port=5432, user='postgres',
                              password='123', dbname='chatbotdev')

---

You can generate an example project that uses this image and PostgresSQL and has everything already configured with: https://github.com/tiangolo/full-stack

Or you can use it to check and compare the differences.

[JORDYSCHEMPARATHY]

@anubhav3itb you shouldn’t connect to the Postgres DB with localhost but with the name of the Postgres container.

So, the section:

    db = psycopg2.connect(host='localhost', port=5432, user='postgres',
                              password='123', dbname='chatbotdev')

Should be:

    db = psycopg2.connect(host='postgres', port=5432, user='postgres',
                              password='123', dbname='chatbotdev')

You can generate an example project that uses this image and PostgresSQL and has everything already configured with: https://github.com/tiangolo/full-stack

Or you can use it to check and compare the differences.

Saved my day. Thanks