Fix renewals on separate containers (#165)

* Added support to reload nginx containter in case only certificates renewal happend. Reusing the autodetection from --volumes-from.

Author: prodrigestivill

README.md

@@ -102,6 +102,8 @@ $ docker run -d \
 ```
 Then start any containers to be proxied as described previously.
 
+* If for some reason you can't use the docker --volumes-from option, you can specify the name or id of the nginx container with `NGINX_PROXY_CONTAINER` variable.
+
 #### Let's Encrypt
 
 To use the Let's Encrypt service to automatically create a valid certificate for virtual host(s).

app/functions.sh

@@ -70,9 +70,14 @@ function docker_kill {
 ## Nginx
 reload_nginx() {
     if [[ -n "${NGINX_DOCKER_GEN_CONTAINER:-}" ]]; then
-        # Using docker-gen separate container
-        echo "Reloading nginx proxy (using separate container ${NGINX_DOCKER_GEN_CONTAINER})..."
+        # Using docker-gen and nginx in separate container
+        echo "Reloading nginx docker-gen (using separate container ${NGINX_DOCKER_GEN_CONTAINER})..."
         docker_kill "$NGINX_DOCKER_GEN_CONTAINER" SIGHUP
+        if [[ -n "${NGINX_PROXY_CONTAINER:-}" ]]; then
+            # Reloading nginx in case only certificates had been renewed
+            echo "Reloading nginx (using separate container ${NGINX_PROXY_CONTAINER})..."
+            docker_kill "$NGINX_PROXY_CONTAINER" SIGHUP
+        fi
     else
         if [[ -n "${NGINX_PROXY_CONTAINER:-}" ]]; then
             echo "Reloading nginx proxy..."