使用Flask/uWSGI应用程序为单独的Docker容器提供服务时，停靠的Nginx上游错误

在运行Docker compose build和Docker compose up并尝试点击我的索引页后，我的多容器Docker安装程序遇到以下错误：

 [error] 8#8: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.99.1, server: localhostz, request: "GET / HTTP/1.1", upstream: "uwsgi://172.17.0.39:8000", host: "192.168.99.100"

这是我的docker-compose.yml：

web:
  restart: always
  build: ./web-app
  expose:
    - "8000"
  command: /usr/local/bin/uwsgi --ini sample-uwsgi.ini

nginx:
  restart: always
  build: ./nginx/
  ports:
    - "80:80"
  links:
    - web:web

nginx/Dockerfile

FROM nginx
RUN rm /etc/nginx/conf.d/default.conf
ADD sample-nginx.conf /etc/nginx/conf.d/

FROM ansible/ubuntu14.04-ansible:stable

WORKDIR /root
ADD application.py application.py
ADD requirements.txt requirements.txt
ADD sample-uwsgi.ini sample-uwsgi.ini

ADD ansible /srv/ansible
WORKDIR /srv/ansible

RUN ansible-playbook container-bootstrap.yml -c local

nginx/sample-nginx.conf

upstream flask {
    server web:8000;
}

server {

    listen 80;
    server_name localhostz;
    charset utf-8;
    client_max_body_size 75M;

    location / {
        uwsgi_pass flask;
        include uwsgi_params;
    }
}

web应用程序/Dockerfile

FROM nginx
RUN rm /etc/nginx/conf.d/default.conf
ADD sample-nginx.conf /etc/nginx/conf.d/

FROM ansible/ubuntu14.04-ansible:stable

WORKDIR /root
ADD application.py application.py
ADD requirements.txt requirements.txt
ADD sample-uwsgi.ini sample-uwsgi.ini

ADD ansible /srv/ansible
WORKDIR /srv/ansible

RUN ansible-playbook container-bootstrap.yml -c local

web应用程序/sample-uswgi.ini

[uwsgi]

module = application
callable = app

master = true
processes = 5

socket = web:8000

chown-socket = www-data:www-data

vacuum = true
enable-threads=True
die-on-term = true

---

请不要发布关于单个容器设置的建议。我正在做一个练习，以便能够扩展单个nginx容器下提供的Docker应用程序容器。

Secret sauce正在将sample-uwsgi.ini中的套接字行更改为：

socket = 0.0.0.0:8000