i have created an app using this code [https://github.com/tiangolo/uwsgi-nginx-flask-docker/tree/356fb1c49b62ac195620901a22d1ac62082bdf74/python2.7-alpine3.8]. when i execute the docker container from my local machine, its working fine. but when deploy to mesos then i noticed couple of things:

*** Operational MODE: preforking ***
Traceback (most recent call last):
File "./main.py", line 3, in
from flask import Flask
ImportError: No module named flask
unable to load app 0 (mountpoint='') (callable not found or import error)
*** no app loaded. GAME OVER ***

more log:

;uWSGI instance configuration
[uwsgi]
cheaper = 2
processes = 16
ini = /app/uwsgi.ini
module = main
callable = app
master = true
chmod-socket = 660
vacuum = true
die-on-term = true
ini = /etc/uwsgi/uwsgi.ini
socket = /tmp/uwsgi.sock
chown-socket = nginx:nginx
chmod-socket = 664
hook-master-start = unix_signal:15 gracefully_kill_them_all
need-app = true
die-on-term = true
plugin = python
show-config = true
;end of configuration

*** Starting uWSGI 2.0.17 (64bit) on [Thu Mar 12 00:52:25 2020] ***
compiled with version: 6.4.0 on 01 May 2018 17:28:25
os: Linux-4.4.0-1072-aws #82-Ubuntu SMP Fri Nov 2 15:00:21 UTC 2018
nodename: 2172e0780eb1
machine: x86_64
clock source: unix
pcre jit disabled
detected number of CPU cores: 8
current working directory: /app
detected binary path: /usr/sbin/uwsgi
your memory page size is 4096 bytes
detected max file descriptor number: 1048576
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uwsgi socket 0 bound to UNIX address /tmp/uwsgi.sock fd 3
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
Python version: 2.7.15 (default, Jul 22 2019, 09:39:07) [GCC 6.4.0]
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x7fe159b49820
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 1239640 bytes (1210 KB) for 16 cores

@tiangolo could you please help me, what could be the issue ?