docker - 为什么通过从容器中暴露 uwsgi 端口，nginx 会收到 502 BAD GATEWAY？

Question

我已经建立了 Dockerfile如下所示:

FROM python:2-jessie

ENV DOCKER_MODE=1

EXPOSE 1818

# everything is copied to my_app like uwsgi.ini and app files
COPY . /my_app

WORKDIR /my_app

CMD ["uwsgi", "--ini", "uwsgi.ini"]

它就像一个魅力:

Sun Oct 29 15:17:34 2017 - uWSGI http bound on 127.0.0.1:1818 fd 4
Sun Oct 29 15:17:34 2017 - uwsgi socket 0 bound to TCP address 127.0.0.1:43183 (port auto-assigned) fd 3
Sun Oct 29 15:17:34 2017 - Python version: 2.7.14 (default, Oct 10 2017, 02:49:49)  [GCC 4.9.2]
Sun Oct 29 15:17:34 2017 - Python main interpreter initialized at 0x1e347e0
Sun Oct 29 15:17:34 2017 - python threads support enabled
Sun Oct 29 15:17:34 2017 - your server socket listen backlog is limited to 100 connections
Sun Oct 29 15:17:34 2017 - your mercy for graceful operations on workers is 10 seconds
Sun Oct 29 15:17:34 2017 - mapped 1155328 bytes (1128 KB) for 50 cores
Sun Oct 29 15:17:35 2017 - WSGI app 0 (mountpoint='') ready in 1 seconds on interpreter 0x1e347e0 pid: 1 (default app)
Sun Oct 29 15:17:35 2017 - *** uWSGI is running in multiple interpreter mode ***
Sun Oct 29 15:17:35 2017 - spawned uWSGI master process (pid: 1)
Sun Oct 29 15:17:35 2017 - spawned uWSGI worker 1 (pid: 9, cores: 50)
Sun Oct 29 15:17:35 2017 - *** Stats server enabled on 127.0.0.1:11818 fd: 12 ***
Sun Oct 29 15:17:35 2017 - spawned uWSGI http 1 (pid: 10)

当我运行 docker 镜像并分配像 33000 这样的端口时，它正在监听该端口:

admin@server:~/application$ sudo netstat -nltp | grep 33000
tcp6       0      0 :::33000                :::*                    LISTEN      10922/docker-proxy

好像没什么不对!现在我的 nginx 代理在端口 80 上传递如下请求:

proxy_pass http://127.0.0.1:33000;

当我将请求发送到端口 80 , 我得到 502 Bad Gateway Error .为什么会这样？

Answer 1

UWSGI 绑定(bind)到 127.0.0.1 , 我改成 0.0.0.0在容器上。并有如下内容:

http-socket=0.0.0.0:1818