LibreNMS Already have device xxx.xxx.xxx.xxx due to duplicate sysName: (none)

resolve:  config.php add
               $config['allow_duplicate_sysName'] = true;

LibreNMS with Docker Cotainer

docker cp librenms:/opt/librenms/config.php .

edit config.php add  $config['allow_duplicate_sysName'] = true;

docker-compose.yml modify

librenms
       volumes:

     - "./config.php:/opt/librenms/config.php"