get containerID fron php server

Dockerfile

 # Using a compact OS
-FROM alpine:latest
+FROM php:5-zts-alpine
 
-MAINTAINER Golfen Guo <golfen.guo@daocloud.io> 
+MAINTAINER Golfen Guo <golfen.guo@daocloud.io>
 
 # Install and configure Nginx
 RUN apk --update add nginx
 RUN sed -i "s#root   html;#root   /usr/share/nginx/html;#g" /etc/nginx/nginx.conf
 RUN ln -sf /dev/stdout /var/log/nginx/access.log \
 	&& ln -sf /dev/stderr /var/log/nginx/error.log
-	
+
 # Add 2048 stuff into Nginx server
 COPY . /usr/share/nginx/html
 
 EXPOSE 80
 
-# Start Nginx and keep it from running background
-CMD ["nginx", "-g", "pid /tmp/nginx.pid; daemon off;"]
-
+# Start Nginx and keep it running background and start php
+CMD nginx -g "pid /tmp/nginx.pid; daemon on;" && php -S 0.0.0.0:8888 /usr/share/nginx/html/hostname.php

hostname.php

+<?php
+header('Access-Control-Allow-Origin: *');
+if ("/" == $_SERVER["REQUEST_URI"]) {
+    echo gethostname();
+}
+?>

js/application.js

@@ -2,3 +2,20 @@
 window.requestAnimationFrame(function () {
   new GameManager(4, KeyboardInputManager, HTMLActuator, LocalStorageManager);
 });
+
+function httpGet(url) {
+    var xmlHttp = new XMLHttpRequest();
+    xmlHttp.open("GET", url, false);
+    xmlHttp.send(null);
+    return xmlHttp.responseText;
+}
+
+function setContainerID() {
+    var hostname = httpGet("http://" + window.location.hostname + ":8888");
+    var container = document.getElementsByClassName("container")[0];
+    var tmp = document.createElement('div');
+    tmp.innerHTML = '<p  style="position:absolute;left:60px;top:100px;">ContainerID: ' + hostname + "</p>";
+    container.insertBefore(tmp, container.children[0]);
+}
+
+setContainerID();