Enable/Disable Nextcloud Maintenance Mode
Maintenance mode is useful when you are making changes to your nextcloud installation like a software upgrade.
To enable maintenance mode, run the command
php7.3 occ maintenance:mode --on
To disable maintenance mode, run
php7.3 occ maintenance:mode --off
Example
www-data@mail:/www/nextcloud$ php occ maintenance:mode --off Maintenance mode disabled www-data@mail:/www/nextcloud$
See Nextcloud