Not able to view my simple flask app using uwsgi and Docker

Question

I am new to Docker and trying to run a simple Flask application using uwsgi and Docker on my Mac. However, I am not able to view it at my provided IP and port. I have following code structure and it's contents:

app - app.py - Dockerfile - requirements.txt - docker-compose.yml - uwsgi.ini

app.py

from flask import Flask

app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'Hello World!'


if __name__ == "__main__":
    app.run(host='0.0.0.0', debug=True)

Dockerfile

FROM python:2.7

MAINTAINER Sanjiv Kumar

ENV PYTHONUNBUFFERED 1

RUN mkdir -p /usr/src/app

WORKDIR /usr/src/app

ADD requirements.txt /usr/src/app/

RUN pip install --no-cache-dir -r requirements.txt

ADD . /usr/src/app

ADD uwsgi.ini /etc/uwsgi.ini

CMD uwsgi --ini /etc/uwsgi.ini

requirements.txt

flask
uwsgi

uwsgi.ini

[uwsgi]
http-socket = 0.0.0.0:8000
chdir = /usr/src/app
wsgi-file = app.py
callable = app
master = true
uid = 1
gid = 1
die-on-term = true
processes = 4
threads = 2

docker-compose.yml

version: '2.0'

services:

  app:
    restart: always
    build: .
    expose:
      - "8000"

Command used: 1) docker-compose build

Building app
Step 1/10 : FROM python:2.7
 ---> 2e9467da064d
Step 2/10 : MAINTAINER Sanjiv Kumar "mr.san.kumar@gmail.com"
 ---> Using cache
 ---> d6540af61f8d
Step 3/10 : ENV PYTHONUNBUFFERED 1
 ---> Using cache
 ---> da36bd7fac3d
Step 4/10 : RUN mkdir -p /usr/src/app
 ---> Using cache
 ---> 7bc4f6d43d1b
Step 5/10 : WORKDIR /usr/src/app
 ---> Using cache
 ---> b246798eab3e
Step 6/10 : ADD requirements.txt /usr/src/app/
 ---> a5027d2fea05
Removing intermediate container 41ff329f473d
Step 7/10 : RUN pip install --no-cache-dir -r requirements.txt
 ---> Running in 550e63481699
Collecting flask (from -r requirements.txt (line 1))
  Downloading Flask-0.12.2-py2.py3-none-any.whl (83kB)
Collecting uwsgi (from -r requirements.txt (line 2))
  Downloading uwsgi-2.0.15.tar.gz (795kB)
Collecting itsdangerous>=0.21 (from flask->-r requirements.txt (line 1))
  Downloading itsdangerous-0.24.tar.gz (46kB)
Collecting Jinja2>=2.4 (from flask->-r requirements.txt (line 1))
  Downloading Jinja2-2.9.6-py2.py3-none-any.whl (340kB)
Collecting Werkzeug>=0.7 (from flask->-r requirements.txt (line 1))
  Downloading Werkzeug-0.12.2-py2.py3-none-any.whl (312kB)
Collecting click>=2.0 (from flask->-r requirements.txt (line 1))
  Downloading click-6.7-py2.py3-none-any.whl (71kB)
Collecting MarkupSafe>=0.23 (from Jinja2>=2.4->flask->-r requirements.txt (line 1))
  Downloading MarkupSafe-1.0.tar.gz
Installing collected packages: itsdangerous, MarkupSafe, Jinja2, Werkzeug, click, flask, uwsgi
  Running setup.py install for itsdangerous: started
    Running setup.py install for itsdangerous: finished with status 'done'
  Running setup.py install for MarkupSafe: started
    Running setup.py install for MarkupSafe: finished with status 'done'
  Running setup.py install for uwsgi: started
    Running setup.py install for uwsgi: finished with status 'done'
Successfully installed Jinja2-2.9.6 MarkupSafe-1.0 Werkzeug-0.12.2 click-6.7 flask-0.12.2 itsdangerous-0.24 uwsgi-2.0.15
 ---> 1e9bc8010456
Removing intermediate container 550e63481699
Step 8/10 : ADD . /usr/src/app
 ---> 3c505272fb58
Removing intermediate container f6b272c829aa
Step 9/10 : ADD uwsgi.ini /etc/uwsgi.ini
 ---> 6cd16b307af8
Removing intermediate container 1ed81b55676f
Step 10/10 : CMD uwsgi --ini /etc/uwsgi.ini
 ---> Running in ec10aefec8d9
 ---> 2116eaa10db3
Removing intermediate container ec10aefec8d9
Successfully built 2116eaa10db3

2) docker-compose up

Creating network "app_default" with the default driver
Creating app_app_1
Attaching to app_app_1
app_1  | [uWSGI] getting INI configuration from /etc/uwsgi.ini
app_1  | *** Starting uWSGI 2.0.15 (64bit) on [Mon May 29 03:53:04 2017] ***
app_1  | compiled with version: 4.9.2 on 29 May 2017 03:52:35
app_1  | os: Linux-4.9.27-moby #1 SMP Thu May 11 04:01:18 UTC 2017
app_1  | nodename: dcedf87d482f
app_1  | machine: x86_64
app_1  | clock source: unix
app_1  | pcre jit disabled
app_1  | detected number of CPU cores: 2
app_1  | current working directory: /usr/src/app
app_1  | detected binary path: /usr/local/bin/uwsgi
app_1  | uWSGI running as root, you can use --uid/--gid/--chroot options
app_1  | setgid() to 1
app_1  | setuid() to 1
app_1  | chdir() to /usr/src/app
app_1  | your memory page size is 4096 bytes
app_1  | detected max file descriptor number: 1048576
app_1  | lock engine: pthread robust mutexes
app_1  | thunder lock: disabled (you can enable it with --thunder-lock)
app_1  | uwsgi socket 0 bound to TCP address 0.0.0.0:8000 fd 3
app_1  | Python version: 2.7.13 (default, May 11 2017, 21:37:12)  [GCC 4.9.2]
app_1  | Python main interpreter initialized at 0x11527a0
app_1  | python threads support enabled
app_1  | your server socket listen backlog is limited to 100 connections
app_1  | your mercy for graceful operations on workers is 60 seconds
app_1  | mapped 415360 bytes (405 KB) for 8 cores
app_1  | *** Operational MODE: preforking+threaded ***
app_1  | WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x11527a0 pid: 5 (default app)
app_1  | *** uWSGI is running in multiple interpreter mode ***
app_1  | spawned uWSGI master process (pid: 5)
app_1  | spawned uWSGI worker 1 (pid: 7, cores: 2)
app_1  | spawned uWSGI worker 2 (pid: 8, cores: 2)
app_1  | spawned uWSGI worker 3 (pid: 9, cores: 2)
app_1  | spawned uWSGI worker 4 (pid: 10, cores: 2)

The thing is I am not getting any errors in the log and therefore I am not sure about the issue. I am guessing the issue is with config files of uwsgi or docker. I am trying to open my app on 0.0.0.0:8000 . Could you guys help me out here?

Not able to view my simple flask app using uwsgi and Docker

Answers (1)

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