How to run as a user and not root

[Brian Hop]

Hello,
I need to run as a user other than root

FROM tiangolo/uvicorn-gunicorn-fastapi:python3.8-alpine3.10

COPY ./app /app
COPY requirements.txt ./

RUN pip install --no-cache-dir -r requirements.txt \
&& addgroup -S appgroup && adduser -S appuser -G appgroup  

USER appuser

Yet when I run image from above dockerfile it errors with below msg

Same code works without issues when I remove USER line above and run as root user

Checking for script in /app/prestart.sh
Running script /app/prestart.sh
Running inside /app/prestart.sh, you could add migrations to this file, e.g.:

#! /usr/bin/env bash

# Let the DB start
sleep 10;
# Run migrations
alembic upgrade head

{"loglevel": "info", "workers": 2, "bind": "0.0.0.0:80", "graceful_timeout": 120, "timeout": 120, "keepalive": 5, "errorlog": "-", "accesslog": "-", "workers_per_core": 1.0, "use_max_workers": null, "host": "0.0.0.0", "port": "80"}
[2020-06-18 19:16:07 +0000] [1] [INFO] Starting gunicorn 20.0.4
[2020-06-18 19:16:07 +0000] [1] [ERROR] Retrying in 1 second.
[2020-06-18 19:16:08 +0000] [1] [ERROR] Retrying in 1 second.
[2020-06-18 19:16:09 +0000] [1] [ERROR] Retrying in 1 second.
[2020-06-18 19:16:10 +0000] [1] [ERROR] Retrying in 1 second.
[2020-06-18 19:16:11 +0000] [1] [ERROR] Retrying in 1 second.
[2020-06-18 19:16:12 +0000] [1] [ERROR] Can't connect to ('0.0.0.0', 80)

what am I missing?

[Brian Hop]

okay think it the default port 80 issue

needed to change the port via
ENV PORT 8080

working fine now

[Sebastián Ramírez]

Cool! Thanks for reporting back and closing the issue 👍

[Thomas]

For whose using classic fastapi "python" image (not the alpine one) the command to add a user:

RUN useradd -ms /bin/bash appuser
USER appuser