问docker nginx未能与web容器连接

EN

dj       | [2017-09-16 12:37:14 +0000] [22] [INFO] Starting gunicorn 19.7.1
dj       | [2017-09-16 12:37:14 +0000] [22] [DEBUG] Arbiter booted
dj       | [2017-09-16 12:37:14 +0000] [22] [INFO] Listening at: http://127.0.0.1:8000 (22)
dj       | [2017-09-16 12:37:14 +0000] [22] [INFO] Using worker: sync
dj       | [2017-09-16 12:37:14 +0000] [25] [INFO] Booting worker with pid: 25
dj       | [2017-09-16 12:37:14 +0000] [22] [DEBUG] 1 workers
ng       | 2017/09/16 12:37:22 [error] 8#8: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.20.0.1, server: localhost, request: "GET /api HTTP/1.1", upstream: "http://127.0.0.1:8000/api/v1", host: "localhost"
ng       | 172.20.0.1 - - [16/Sep/2017:12:37:22 +0000] "GET /api HTTP/1.1" 502 537 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/52.0.2743.116 Chrome/52.0.2743.116 Safari/537.36" "-"
ng       | 2017/09/16 12:37:31 [error] 8#8: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.20.0.1, server: localhost, request: "GET /admin HTTP/1.1", upstream: "http://127.0.0.1:8000/api/admin", host: "localhost"
ng       | 172.20.0.1 - - [16/Sep/2017:12:37:31 +0000] "GET /admin HTTP/1.1" 502 537 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/52.0.2743.116 Chrome/52.0.2743.116 Safari/537.36" "-"

$ docker-compose exec api bash
root@e29e3756916c:/code# curl http://127.0.0.1:8000
root@e29e3756916c:/code# curl http://127.0.0.1:8000/api/v1
root@e29e3756916c:/code# curl -L http://127.0.0.1:8000/api/v1
{"_type":"document","_meta":{"url":"http://127.0.0.1:8000/api/v1/","title":"Backend APIs"},"auth":{"convert-token":{"create":{"_type":"link","url":"/api/v1/auth/convert-token/","action":"post","description":"Implements an endpoint to convert a provider token to an access token\n\nThe endpoint is used in the following flows:\n\n* Authorization code\n* Client credentials"}},"revoke-token":{"create":{"_type":"link","url":"/api/v1/auth/revoke-token/","action":"post","description":"Implements an endpoint to revoke access or refresh tokens"}},"sign_in":{"create":{"_type":"link","url":"/api/v1/auth/sign_in/","action":"post","encoding":"application/json","fields":[{"name":"username","required":true,"location":"form","schema":{"_type":"string","title":"Username","description":""}},{"name":"password","required":true,"location":"form","schema":{"_type":"string","title":"Password","description":""}}]}},"sign_up":{"create":{"_type":"link","url":"/api/v1/auth/sign_up/","action":"post","encoding":"application/json","fields":[{"name":"first_name","location":"form","schema":{"_type":"string","title":"First name","description":""}},{"name":"last_name","location":"form","schema":{"_type":"string","title":"Last name","description":""}},{"name":"email","location":"form","schema":{"_type":"string","title":"Email address","description":""}},{"name":"username","required":true,"location":"form","schema":{"_type":"string","title":"Username","description":"Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only."}},{"name":"password","required":true,"location":"form","schema":{"_type":"string","title":"Password","description":""}},{"name":"is_active","location":"form","schema":{"_type":"boolean","title":"Active","description":"Designates whether this user should be treated as active. Unselect this instead of deleting accounts."}}]}},"token":{"create":{"_type":"link","url":"/api/v1/auth/token/","action":"post","description":"Implements an endpoint to provide access tokens\n\nThe endpoint is used in the following flows:\n\n* Authorization code\n* Password\n* Client credentials"}}}}root@e29e3756916c:/code# 
root@e29e3756916c:/code#

server {
  listen       80;
  server_name  localhost;

  #charset koi8-r;
  #access_log  /var/log/nginx/host.access.log  main;

  #error_page  404              /404.html;

  # redirect server error pages to the static page /50x.html
  #
  error_page   500 502 503 504  /50x.html;
  location = /50x.html {
      root   /usr/share/nginx/html;
  }

  proxy_force_ranges      on;
  proxy_set_header        Host $host;
  proxy_set_header        X-Real-IP $remote_addr;
  proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header        X-Forwarded-Proto $http_x_forwarded_proto;

  location /admin {
    proxy_pass              http://127.0.0.1:8000/api/admin;
  }
  location /api {
    proxy_pass              http://127.0.0.1:8000/api/v1;
  }
  location /oauth {
    proxy_pass              http://127.0.0.1:8000/api/oauth;
  }
  location /static {
    proxy_pass              http://127.0.0.1:8000/static;
  }
  location / {
    root   /usr/share/nginx/html;
    index  index.html index.htm;
    try_files $uri $uri/ /index.html;
  }
}

FROM nginx:latest

#RUN apt-get update

ADD ./static /usr/share/nginx/html

ADD nginx.conf /etc/nginx/conf.d/default.conf

ENV NGINX_PORT 80

EXPOSE 80

CMD /bin/bash -c "nginx -g 'daemon off;'"

version: '2'  
services:  
  nginx:
    build: ./nginx
    container_name: ng
    ports:
      - "80:80"
    #volumes:
    #  - ./src:/src
    #  - ./config/nginx:/etc/nginx/conf.d
    depends_on:
      - api
    links:
      - api
    volumes_from:
      - api
  api:
    build: ./s2s_api
    container_name: dj
    command: bash ./wait_for_db.sh
    restart: always
    depends_on:
      - db
    ports:
      - "8000:8000"
    tty: true
    links: 
      - db:mysql

  db:
    image: mysql
    container_name: db
    command: mysqld --user=root --verbose
    volumes:
      - ./dbcreation.sql:/tmp/dbcreation.sql
      - ./import.sh:/tmp/import.sh
    ports:
      - "3306:3306"
    restart: always
    environment:
      MYSQL_DATABASE: "S2S"
      MYSQL_USER: "root"
      MYSQL_PASSWORD: "avi"
      MYSQL_ROOT_PASSWORD: "avi"
      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
      DB_PORT: 3306
      DB_HOST: db

#!/bin/sh
# Wait for database to get available

M_LOOPS="10"

#wait for mysql
i=0
# http://stackoverflow.com/a/19956266/4848859
while ! curl db:3306 >/dev/null 2>&1 < /dev/null; do
  i=`expr $i + 1`

  if [ $i -ge $M_LOOPS ]; then
    echo "$(date) - db:3306 still not reachable, giving up"
    exit 1
  fi

  echo "$(date) - waiting for db:3306..."
  sleep 3
done

echo "$(date) - db:3306 Reachable ! - Starting Daemon"
#start the daemon
#exec $START_CMD
python manage.py makemigrations
python manage.py migrate
gunicorn s2s_api.wsgi:application -b 127.0.0.1:8000 --log-level debug