Update README - Nginx proxy must use host network to support overlay network

README.md

@@ -8,7 +8,7 @@ See [Automated Nginx Reverse Proxy for Docker][2] for why you might want to use
 
 To run it:
 
-    $ docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
+    $ docker run -d --net=host -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
 
 Then start any containers you want proxied with an env var `VIRTUAL_HOST=subdomain.youdomain.com`
 
@@ -41,7 +41,7 @@ If you would like to connect to your backend using HTTPS instead of HTTP, set `V
 
 To set the default host for nginx use the env var `DEFAULT_HOST=foo.bar.com` for example
 
-    $ docker run -d -p 80:80 -e DEFAULT_HOST=foo.bar.com -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
+    $ docker run -d --net=host -p 80:80 -e DEFAULT_HOST=foo.bar.com -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
 
 
 ### Separate Containers
@@ -56,12 +56,13 @@ To run nginx proxy as a separate container you'll need to have [nginx.tmpl](http
 First start nginx with a volume:
 
 
-    $ docker run -d -p 80:80 --name nginx -v /tmp/nginx:/etc/nginx/conf.d -t nginx
+    $ docker run -d --net=host -p 80:80 --name nginx -v /tmp/nginx:/etc/nginx/conf.d -t nginx
 
 Then start the docker-gen container with the shared volume and template:
 
 ```
 $ docker run --volumes-from nginx \
+    --net=host \
     -v /var/run/docker.sock:/tmp/docker.sock:ro \
     -v $(pwd):/etc/docker-gen/templates \
     -t jwilder/docker-gen -notify-sighup nginx -watch -only-exposed /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
@@ -78,7 +79,7 @@ certificates or optionally specifying a cert name (for SNI) as an environment va
 
 To enable SSL:
 
-    $ docker run -d -p 80:80 -p 443:443 -v /path/to/certs:/etc/nginx/certs -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
+    $ docker run -d --net=host -p 80:80 -p 443:443 -v /path/to/certs:/etc/nginx/certs -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
 
 The contents of `/path/to/certs` should contain the certificates and private keys for any virtual
 hosts in use.  The certificate and keys should be named after the virtual host with a `.crt` and
@@ -127,7 +128,7 @@ In order to be able to secure your virtual host, you have to create a file named
 /etc/nginx/htpasswd/$VIRTUAL_HOST
 
 ```
-$ docker run -d -p 80:80 -p 443:443 \
+$ docker run -d --net=host -p 80:80 -p 443:443 \
     -v /path/to/htpasswd:/etc/nginx/htpasswd \
     -v /path/to/certs:/etc/nginx/certs \
     -v /var/run/docker.sock:/tmp/docker.sock:ro \
@@ -175,7 +176,7 @@ RUN { \
 
 Or it can be done by mounting in your custom configuration in your `docker run` command:
 
-    $ docker run -d -p 80:80 -p 443:443 -v /path/to/my_proxy.conf:/etc/nginx/conf.d/my_proxy.conf:ro -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
+    $ docker run -d --net=host -p 80:80 -p 443:443 -v /path/to/my_proxy.conf:/etc/nginx/conf.d/my_proxy.conf:ro -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
 
 #### Per-VIRTUAL_HOST
 
@@ -185,7 +186,7 @@ In order to allow virtual hosts to be dynamically configured as backends are add
 
 For example, if you have a virtual host named `app.example.com`, you could provide a custom configuration for that host as follows:
 
-    $ docker run -d -p 80:80 -p 443:443 -v /path/to/vhost.d:/etc/nginx/vhost.d:ro -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
+    $ docker run -d --net=host -p 80:80 -p 443:443 -v /path/to/vhost.d:/etc/nginx/vhost.d:ro -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
     $ { echo 'server_tokens off;'; echo 'client_max_body_size 100m;'; } > /path/to/vhost.d/app.example.com
 
 If you are using multiple hostnames for a single container (e.g. `VIRTUAL_HOST=example.com,www.example.com`), the virtual host configuration file must exist for each hostname. If you would like to use the same configuration for multiple virtual host names, you can use a symlink:
@@ -205,7 +206,7 @@ just like the previous section except with the suffix `_location`.
 
 For example, if you have a virtual host named `app.example.com` and you have configured a proxy_cache `my-cache` in another custom file, you could tell it to use a proxy cache as follows:
 
-    $ docker run -d -p 80:80 -p 443:443 -v /path/to/vhost.d:/etc/nginx/vhost.d:ro -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
+    $ docker run -d --net=host -p 80:80 -p 443:443 -v /path/to/vhost.d:/etc/nginx/vhost.d:ro -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
     $ { echo 'proxy_cache my-cache;'; echo 'proxy_cache_valid  200 302  60m;'; echo 'proxy_cache_valid  404 1m;' } > /path/to/vhost.d/app.example.com_location
 
 If you are using multiple hostnames for a single container (e.g. `VIRTUAL_HOST=example.com,www.example.com`), the virtual host configuration file must exist for each hostname. If you would like to use the same configuration for multiple virtual host names, you can use a symlink: