Nginx中的Heroku（Docker）PORT环境变量 [英] Heroku (Docker) PORT environment variable in nginx

问题描述

我只是对Dockerfile进行了一些修改，以便在Heroku上使用Nginx运行它。 Heroku的特别之处在于，所有内容都以非root用户身份运行。其次，某些行为是使用来自Heroku本身的随机端口，您无法对其进行修改。它们提供了env $ PORT，您应将其绑定到nginx。如果Heroku识别到该端口未绑定某些内容，则会停止整个容器。问题是：

如何将nginx绑定到给定的env变量，以便在nginx-site.conf中具有动态端口？
我尝试在 Dockefile 中使用以下内容：

env PORT; nginx.conf 中的$ c>和监听PORT_from_env; nginx-site.conf 中的
在 nginx-site.conf 中尝试监听80; 和 RUN / bin / sed -i s / list 80 / listen $ {PORT} / /etc/nginx/sites-available/default.conf 在 Dockerfile

中

<我绝对超能力。有人有想法或可以帮忙吗？

---

其他信息：

• https://devcenter.heroku.com/articles/dynos#web -dynos

解决方案

通过遵循此示例：

第1步：在 default.conf.template

$中收听 $ PORT b
$ b

  server {
 listen $ PORT default_server; 
 
位置/ {
 root / usr / share / nginx / html; 
 index index.html; 
} 
} 
  

步骤2：添加此指令到您的 Dockerfile

  COPY default.conf.template / etc /nginx/conf.d/default.conf.template 
  

步骤3：在 Dockerfile

  CMD / bin / bash -c envsubst'\ $ PORT'< /etc/nginx/conf.d/default.conf.template> /etc/nginx/conf.d/default.conf& ;& nginx -g‘关闭守护进程；’
  

I just take a few modifications on a Dockerfile to run it with nginx on Heroku. Something special about Heroku is, that everything is running as non-root. Second certain behaviour is the use of a random Port which comes from Heroku itself and you can't be modified. They provide the env $PORT which you should bind to nginx. If Heroku recognizes that something isn't bind to that port it stops the entire container. Question is:

How can I bind nginx to a given env variable in order to have a dynamic port in the nginx-site.conf? I tried to use things like follows in the Dockefile:

env PORT; in nginx.conf and listen PORT_from_env; in the nginx-site.conf Also tried listen 80; in the nginx-site.conf and RUN /bin/sed -i "s/listen 80/listen ${PORT}/" /etc/nginx/sites-available/default.conf in the Dockerfile

I am absolutely above my capabilities. Someone has an idea or can help? It be very helpful!

---

Further information:

• https://devcenter.heroku.com/articles/dynos#web-dynos

解决方案

I got it working for my app by following this example :

Step 1: listen to $PORT in default.conf.template

server {
  listen $PORT default_server;

  location / {
    root   /usr/share/nginx/html;
    index  index.html;
  }
}

Step 2: add this directive to your Dockerfile

COPY default.conf.template /etc/nginx/conf.d/default.conf.template

Step 3: add this at the end of your Dockerfile

CMD /bin/bash -c "envsubst '\$PORT' < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf" && nginx -g 'daemon off;'

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