Support for separate nginx and docker-gen containers

README.md

@@ -43,6 +43,24 @@ Then start any containers you want to proxied with a env var `VIRTUAL_HOST=subdo
 
 The containers being proxied must [expose](https://docs.docker.com/reference/run/#expose-incoming-ports) the port to be proxied, either by using the `EXPOSE` directive in their `Dockerfile` or by using the `--expose` flag to `docker run` or `docker create`. See [nginx-proxy](https://github.com/jwilder/nginx-proxy) for more informations. To generate automatically Let's Encrypt certificates see next section.
 
+#### Separate Containers
+nginx-proxy can also be run as two separate containers using the [jwilder/docker-gen](https://github.com/jwilder/docker-gen)
+image and the official [nginx](https://hub.docker.com/_/nginx/) image.
+
+* First start nginx and docker-gen containers separately following the instructions in [separate-container-install](https://github.com/jwilder/docker-gen#separate-container-install)
+
+* Second start this container:
+```bash
+$ docker run -d \
+    -v /path/to/certs:/etc/nginx/certs:rw \
+    --volumes-from nginx-proxy \
+    -v /var/run/docker.sock:/var/run/docker.sock:ro \
+    -v /tmp/templates:/etc/docker-gen/templates \
+    -e SEPARATE_CONTAINER_INSTALL=true \
+    jrcs/letsencrypt-nginx-proxy-companion
+```
+Then start any containers to be proxied as described previously.
+
 #### Let's Encrypt
 
 To use the Let's Encrypt service to automatically create a valid certificate for virtual host(s).

app/functions.lib

@@ -60,9 +60,20 @@ function docker_exec {
 
 ## Nginx
 reload_nginx() {
-    if [[ -n "${NGINX_PROXY_CID:-}" ]]; then
-        echo "Reloading nginx proxy..."
-        docker_exec "$NGINX_PROXY_CID" \
-         '[ "sh", "-c", "/usr/local/bin/docker-gen -only-exposed /app/nginx.tmpl /etc/nginx/conf.d/default.conf; /usr/sbin/nginx -s reload" ]'
+
+    if [[ "${SEPARATE_CONTAINER_INSTALL}" == "true" ]]; then
+        echo "Generating nginx configuration..."
+        /usr/local/bin/docker-gen -only-exposed /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
+        if [[ -n "${NGINX_PROXY_CID:-}" ]]; then
+            echo "Reloading nginx proxy..."
+            docker_exec "$NGINX_PROXY_CID" \
+             '[ "sh", "-c", "/usr/sbin/nginx -s reload" ]'
+        fi
+    else
+        if [[ -n "${NGINX_PROXY_CID:-}" ]]; then
+            echo "Reloading nginx proxy..."
+            docker_exec "$NGINX_PROXY_CID" \
+            '[ "sh", "-c", "/usr/local/bin/docker-gen -only-exposed /app/nginx.tmpl /etc/nginx/conf.d/default.conf ; /usr/sbin/nginx -s reload" ]'
+        fi
     fi
 }