Merge pull request #490 from silverbios/set-listener-address

Add option to set IP Address for web interface in Docker env - thanks to @silverbios 🙏

dockerfiles/README.md

@@ -35,6 +35,7 @@ docker run -d --rm --network=host \
 | Variable | Description | Default |
 | :------------- |:-------------| -----:|
 | `PORT`      |Port of the web interface  |  `20211` |
+| `LISTEN_ADDR`      |Set the specific IP Address for the web interface  |  `0.0.0.0` |
 |`TZ` |Time zone to display stats correctly. Find your time zone [here](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones)  |  `Europe/Berlin` |
 |`HOST_USER_GID`    |User ID (UID) to map the user in the container to a server user with sufficient read&write permissions on the mapped files   |  `1000` |
 |`HOST_USER_ID` |User Group ID (GID)  to map the user group in the container to a server user group with sufficient read&write permissions on the mapped files    |    `1000` |

dockerfiles/start.sh

@@ -48,6 +48,10 @@ sudo ln -s "$INSTALL_DIR/pialert/install/default" /etc/nginx/sites-available/def
 # use user-supplied port
 sudo sed -i 's/listen 80/listen '"$PORT"'/g' /etc/nginx/sites-available/default
 
+# Change web interface address if set
+if [ -n "${LISTEN_ADDR}" ]; then  
+  sed -ie 's/listen /listen '${LISTEN_ADDR}:'/g' /etc/nginx/sites-available/default
+fi
 
 # Run the hardware vendors update at least once
 echo "[INSTALL] Run the hardware vendors update"