Merge pull request 'remove_cgroup' (#1) from remove_cgroup into master

Reviewed-on: #1

README.md

@@ -26,6 +26,9 @@ Since the container uses Docker's internal event reporting, it needs access to t
 moment, only access via UNIX socket is possible. Because of that, the socket has to be handed
 into the container (*-v /var/run/docker.sock:/var/run/docker.sock*).
 
+**Note: do not change hostname for container, since the code relies on the hostname to be 
+the short id!**
+
 ### Single IP / All IPs
 This option is used if your Docker Host has only one IP or if there is no need to differentiate between different IPs regarding wether a Web App
 is available on it.

nginx_proxy.py

@@ -172,22 +172,9 @@ def get_pid():
 
 
 def get_docker_id():
-    """This function extracts the container's id from /proc/self/cgroup."""
-    id = ''
-    with open('/proc/self/cgroup', 'r') as file:
-        lines = file.read().split('\n')
-        for line in lines:
-            index = line.find('docker-')
-            if index != -1:
-                id = line[index+7:-6]
-                break
-            index = line.find('docker/')
-            if index != -1:
-                id = line[index+7:]
-                break
-    if id == '':
-        logging.error('could not determine container\'s id!')
-    return id
+    """This function extracts the container's id from /etc/hostname."""
+    with open('/etc/hostname', 'r') as file:
+        return file.read().strip()
 
 
 def get_listen_ips():