为什么nginx在向链接的docker容器做`uwsgi_pass`时返回502？
我使用Docker Compose编排由Django Web应用程序和nginx反向代理组成的多容器应用程序。
我正在盯着一个简单的testing案例，但我已经遇到了障碍。 应用程序应通过uwsgi_pass通过networking套接字（ frontend:8000 ）将所有的请求传递给Django应用程序。
但是，在启动docker-compose up的应用程序并且看到没有错误消息后，任何请求/在控制台中产生以下错误消息： gateway_1 | 2016/01/11 15:45:12 [error] 8#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.99.1, server: localhost, request: "GET / HTTP/1.1", upstream: "uwsgi://172.17.0.2:8000", host: "192.168.99.100:8000" gateway_1 | 2016/01/11 15:45:12 [error] 8#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.99.1, server: localhost, request: "GET / HTTP/1.1", upstream: "uwsgi://172.17.0.2:8000", host: "192.168.99.100:8000"
我的问题如下：问题是什么？ replaceuwsgi_pass frontend; 在content_by_lua_file path/to/file.lua;的location块中content_by_lua_file path/to/file.lua; 行为如预期，所以我怀疑uWSGI在容器链接上存在问题，但是我不知道下一步的位置。
以下是相关文件：
Docker撰写：30,000英尺的视图
docker-compose.yml文件如下：
postgres: image: mystuff/app.testdb:latest expose: - "5432" frontend: image: mystuff/app.frontend:latest expose: - "8000" environment: APP_DBCONN: "user=xxx dbname=xxx port=5432 host=postgres sslmode=require password=xxx" APP_ENV: "test" gateway: image: mystuff/app.gateway:latest links: - frontend expose: - "8000" ports: - "8000:8000"
NGINX：反向代理
以下是我的nginx.conf文件：
worker_processes 1; user me; events { use epoll; worker_connections 1024; } http { access_log /dev/stdout; upstream frontend { server frontend:8000; # assumption: `frontend` is a known hostname thanks to docker-compose } server { listen 8000; server_name localhost; location / { uwsgi_pass frontend; include uwsgi_params; } } }
最后，这是我的uwsgi_params文件：
uwsgi_param QUERY_STRING $query_string; uwsgi_param REQUEST_METHOD $request_method; uwsgi_param CONTENT_TYPE $content_type; uwsgi_param CONTENT_LENGTH $content_length; uwsgi_param REQUEST_URI $request_uri; uwsgi_param PATH_INFO $document_uri; uwsgi_param DOCUMENT_ROOT $document_root; uwsgi_param SERVER_PROTOCOL $server_protocol; uwsgi_param REQUEST_SCHEME $scheme; uwsgi_param HTTPS $https if_not_empty; uwsgi_param REMOTE_ADDR $remote_addr; uwsgi_param REMOTE_PORT $remote_port; uwsgi_param SERVER_PORT $server_port; uwsgi_param SERVER_NAME $server_name;
uWSGI＆Django：应用程序服务器
uwsgi.ini ：
[uwsgi] chdir = /home/app wsgi-file = ./NFC/wsgi.py socket = 127.0.0.1:8000 master = true processes = 1 threads = 2 uid = me
编辑
1.在uwsgi.ini输出http = 127.0.0.1:8000
$ cat /tmp/uwsgi.log *** Starting uWSGI 2.0.12 (64bit) on [Wed Jan 13 12:09:44 2016] *** compiled with version: 4.9.2 on 03 January 2016 21:09:04 os: Linux-4.1.13-boot2docker #1 SMP Fri Nov 20 19:05:50 UTC 2015 nodename: default machine: x86_64 clock source: unix pcre jit disabled detected number of CPU cores: 1 current working directory: /home/srg detected binary path: /home/srg/.pyenv/versions/2.7.11/bin/uwsgi chdir() to /home/srg your processes number limit is 1048576 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 http bound on 127.0.0.1:8000 fd 7 uwsgi socket 0 bound to TCP address 127.0.0.1:38922 (port auto-assigned) fd 6 Python version: 2.7.11 (default, Jan 3 2016, 21:07:12) [GCC 4.9.2] Python main interpreter initialized at 0x1d37300 python threads support enabled your server socket listen backlog is limited to 100 connections your mercy for graceful operations on workers is 60 seconds mapped 166144 bytes (162 KB) for 2 cores *** Operational MODE: threaded *** WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x1d37300 pid: 173 (default app) *** uWSGI is running in multiple interpreter mode *** spawned uWSGI master process (pid: 173) spawned uWSGI worker 1 (pid: 210, cores: 2) spawned uWSGI http 1 (pid: 211) SIGINT/SIGQUIT received...killing workers... gateway "uWSGI http 1" has been buried (pid: 211) worker 1 buried after 1 seconds goodbye to uWSGI.
有了这个uWSGIconfiguration，尤其是：
socket = 127.0.0.1:8000
uWSGI将只允许本地连接（这意味着从相同的docker，而不是主机或其他docker）。 要允许来自Docker外部的连接，您必须将其更改为：
socket = :8000
尝试将以下属性添加到.iniconfiguration中。
chmod-socket = 666