title: Docker image custom nginx.conf
body: <p>I am fairly new to this, I don't know if I am heading in the right direction or not. I have a custom nginx.conf that works fine, I am now trying to build a docker image with it so that I can run it as a container in kuberentes. </p>
  
  <p>Here is my nginx.conf</p>
  
  <pre><code>user nginx;
  worker_processes auto;
  error_log /var/log/nginx/error.log;
  pid /run/nginx.pid;
  
  # Load dynamic modules. See /usr/share/nginx/README.dynamic.
  include /usr/share/nginx/modules/*.conf;
  
  events {
      worker_connections 1024;
  }
  
  
  stream {
      #define the various upstreams
      upstream app_1 {
          server 192.168.122.206:5678;
      }
  
      upstream app_2 {
          server 192.168.122.206:9000;
      }   
      #map source port to upstream
      map $remote_port $backend_svr {
          1234 "app_1";
          1235 "app_2";
      }
      #all udp traffic received on 8000, depending on source it will be redirected
      server {
          listen 8000 udp;
          proxy_pass $backend_svr;
      }
  
  }
  </code></pre>
  
  <p>On my virtual machine I have /home/asvilla/docker-files/nginx-udp/Dockerfile  which contains </p>
  
  <pre><code>FROM nginx
  RUN chmod +w /etc/nginx/nginx.conf
  COPY nginx.conf /etc/nginx/nginx.conf
  RUN cat /etc/nginx/nginx.conf
  </code></pre>
  
  <p>I build it using </p>
  
  <pre><code>docker build -t "custom_nginx:dockerfile" .
  </code></pre>
  
  <p>The nginx container should redirect udp traffic incoming on port 8000 to either port 5678 or port 9000 depending on the source of the udp packet. </p>
  
  <p>I run with docker run 'image-id' but it doesn't function as expected. Running docker ps shows "PORTS   80/tcp "
  and "COMMAND  nginx-g daemon of ..."</p>
  
  <p>Any pointers on what these mean. nginx by default binds tcp to port 80 but I have changed the nginx.conf, the cat command I run shows that the file is updated. </p>
  
  <p>I am assuming that I have to expose the ports in the nginx.conf somehow. Any help much appreciated.</p>