Why might gunicorn be hanging in this configuration? - django

Question

I'm building a multi-container application using Docker. Everything works well with the Django (1.7) dev server. But when I try to run gunicorn the command gunicorn wsgi:application seems to start, then provides no output and keeps control of the terminal until I hit Ctrl-C. This regrettably means I have little useful debugging information.
My API's Dockerfile is like this:
FROM ubuntu:14.04
MAINTAINER Garry Cairns
ENV REFRESHED_AT 2015-01-13
# update packages and prepare to build software
RUN ["apt-get", "update"]
RUN ["apt-get", "-y", "install", "build-essential", "vim", "git", "curl"]
RUN ["locale-gen", "en_GB.UTF-8"]
# install latest python
RUN ["apt-get", "-y", "build-dep", "python3-dev", "python3-imaging"]
RUN ["apt-get", "-y", "install", "python3-dev", "python3-imaging", "python3-pip"]
# prepare postgreSQL support
RUN ["apt-get", "-y", "build-dep", "python3-psycopg2"]
# create a python user to run our programs
RUN ["groupadd", "-r", "python"]
RUN ["useradd", "-r", "-g", "python", "python"]
WORKDIR /home/python
ADD ./ /home/python
# manage requirements
ENV REQUIREMENTS_REFRESHED_AT 2015-02-09
RUN ["pip3", "install", "-r", "requirements.txt"]
My production settings (broadly the cookiecutter django defaults) are like this at the moment:
# -*- coding: utf-8 -*-
'''
Production Configurations
- Use djangosecure
- Use Amazon's S3 for storing static files and uploaded media
- Use sendgrid to send emails
- Use MEMCACHIER on Heroku
'''
from configurations import values
# See: http://django-storages.readthedocs.org/en/latest/backends/amazon-S3.html#settings
try:
from S3 import CallingFormat
AWS_CALLING_FORMAT = CallingFormat.SUBDOMAIN
except ImportError:
# TODO: Fix this where even if in Dev this class is called.
pass
from .common import Common
class Production(Common):
# INSTALLED_APPS
INSTALLED_APPS = Common.INSTALLED_APPS
# END INSTALLED_APPS
# SECRET KEY
SECRET_KEY = "Change me" # values.SecretValue()
# END SECRET KEY
# django-secure
INSTALLED_APPS += ("djangosecure", )
# set this to 60 seconds and then to 518400 when you can prove it works
SECURE_HSTS_SECONDS = 60
SECURE_HSTS_INCLUDE_SUBDOMAINS = values.BooleanValue(True)
SECURE_FRAME_DENY = values.BooleanValue(True)
SECURE_CONTENT_TYPE_NOSNIFF = values.BooleanValue(True)
SECURE_BROWSER_XSS_FILTER = values.BooleanValue(True)
SESSION_COOKIE_SECURE = values.BooleanValue(False)
SESSION_COOKIE_HTTPONLY = values.BooleanValue(True)
SECURE_SSL_REDIRECT = values.BooleanValue(True)
# end django-secure
# SITE CONFIGURATION
# Hosts/domain names that are valid for this site
# See https://docs.djangoproject.com/en/1.6/ref/settings/#allowed-hosts
ALLOWED_HOSTS = ["*"]
# END SITE CONFIGURATION
INSTALLED_APPS += ("gunicorn", )
# STORAGE CONFIGURATION
# See: http://django-storages.readthedocs.org/en/latest/index.html
INSTALLED_APPS += (
'storages',
)
# See: http://django-storages.readthedocs.org/en/latest/backends/amazon-S3.html#settings
STATICFILES_STORAGE = DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
# See: http://django-storages.readthedocs.org/en/latest/backends/amazon-S3.html#settings
AWS_ACCESS_KEY_ID = "test" # values.SecretValue()
AWS_SECRET_ACCESS_KEY = "test" # values.SecretValue()
AWS_STORAGE_BUCKET_NAME = "test" # values.SecretValue()
AWS_AUTO_CREATE_BUCKET = True
AWS_QUERYSTRING_AUTH = False
# AWS cache settings, don't change unless you know what you're doing:
AWS_EXPIRY = 60 * 60 * 24 * 7
AWS_HEADERS = {
'Cache-Control': 'max-age=%d, s-maxage=%d, must-revalidate' % (
AWS_EXPIRY, AWS_EXPIRY)
}
# See: https://docs.djangoproject.com/en/dev/ref/settings/#static-url
STATIC_URL = 'https://s3.amazonaws.com/%s/' % AWS_STORAGE_BUCKET_NAME
# END STORAGE CONFIGURATION
# EMAIL
DEFAULT_FROM_EMAIL = values.Value('Correspondence <noreply#example.com>')
EMAIL_HOST = values.Value('smtp.sendgrid.com')
EMAIL_HOST_PASSWORD = "test" # values.SecretValue(environ_prefix="", environ_name="SENDGRID_PASSWORD")
EMAIL_HOST_USER = "test" # values.SecretValue(environ_prefix="", environ_name="SENDGRID_USERNAME")
EMAIL_PORT = values.IntegerValue(587, environ_prefix="", environ_name="EMAIL_PORT")
EMAIL_SUBJECT_PREFIX = values.Value('[Correspondence] ', environ_name="EMAIL_SUBJECT_PREFIX")
EMAIL_USE_TLS = True
SERVER_EMAIL = EMAIL_HOST_USER
# END EMAIL
# TEMPLATE CONFIGURATION
# See: https://docs.djangoproject.com/en/dev/ref/settings/#template-dirs
TEMPLATE_LOADERS = (
('django.template.loaders.cached.Loader', (
'django.template.loaders.filesystem.Loader',
'django.template.loaders.app_directories.Loader',
)),
)
# END TEMPLATE CONFIGURATION
# CACHING
# Only do this here because thanks to django-pylibmc-sasl and pylibmc
# memcacheify is painful to install on windows.
try:
# See: https://github.com/rdegges/django-heroku-memcacheify
from memcacheify import memcacheify
CACHES = memcacheify()
except ImportError:
CACHES = values.CacheURLValue(default="memcached://127.0.0.1:11211")
# END CACHING
Those interested could also check out the full project source. Anyone know what's going wrong here? Or even a way I can get more useful debugging information?

Answer 1

Use the --bind flag with gunicorn.
Example:
gunicorn wsgi:application --bind:0.0.0.0:80