fix doc

obfsproxy/README.md

@@ -4,16 +4,53 @@ OpenVPN over Obfsproxy
 Obfsproxy is a pluggable transport proxy written in python.  
 We can transport OpenVPN over Obfsproxy, so that firewall cannot detect it.  
 
-To use the example bellow, you should run `kylemanna/openvpn` with tcp first.
+Obfsproxy provides several obfuscation method. I consider `scramblesuit` the best.  
+I will update this image if there's better one.
+
+To use the example bellow, you should run `kylemanna/openvpn` container first.  
+Don't forget to edit `/etc/openvpn/openvpn.conf` to use `proto tcp`.
 
 ## docker-compose.yml
 
 ```
+data:
+  image: busybox:latest
+  volumes:
+  - /etc/openvpn
+
+server:
+  image: kylemanna/openvpn:latest
+  ports:
+  - "1194:1194/tcp"
+  volumes_from:
+  - data
+  cap_add:
+  - NET_ADMIN
+  restart: always
+
 obfsproxy:
   image: vimagick/obfsproxy:latest
   ports:
     - "4911:4911"
   links:
+    - server:openvpn
+  environment:
+    - PASSWORD=J23TNHPJPAOQJLTCPLFD4CQYVFY6MEVP
+    - DEST_HOST=openvpn
+    - DEST_PORT=1194
+    - LISTEN_ADDR=0.0.0.0
+    - LISTEN_PORT=4911
+  restart: always
+```
+
+To link a existing `openvpn` container, please use `external_links` instead of `links`.
+
+```yaml
+obfsproxy:
+  image: vimagick/obfsproxy:latest
+  ports:
+    - "4911:4911"
+  external_links:
     - openvpn_server_1:openvpn
   environment:
     - PASSWORD=J23TNHPJPAOQJLTCPLFD4CQYVFY6MEVP
@@ -24,3 +61,9 @@ obfsproxy:
   restart: always
 ```
 
+The password should be encoded by Base32 with fixed length.  
+You can generate one via this command:
+
+```bash
+python -c 'import base64, os; print base64.b32encode(os.urandom(20))'
+```