Application packaging ### Multi-instance Multi-instance is application capacity to be installed several times. #### Scripts When YunoHost installs the application a second time, it gives to the script, at last argument, `${id}__2` with the application `${id}` coming from the manifest. The value `n` in `${id}__n` is incremented each time a new instance of the application is installed. **E.g.** in the roundcube script, database is called `roundcube`, the install directory `roundcube` and the [Nginx configuration](packaging_apps_nginx_conf_en) `roundcube`. This way, the second instance of roundcube will not conflict with the first one, and will be installed in the `roundcube__2` database, in the `roundcube__2`directory, and with the `roundcube__2` Nginx configuration. Retrieve last variable given to scripts: ```bash APP=${!#} ``` #### Manifest Set `multi_instance` variable to `true` in the [manifest](packaging_apps_manifest_en): ```json "multi_instance": true, ```