J'avais bien un doute là dessus mais à priori le cron se lance toutes les 2 minutes :
*/2 * * * * /usr/bin/php /var/www/html/moodle33/admin/cli/cron.php >/dev/null
lancé à la main : rien ne change
Sortie de la tâche cron :
Server Time: Tue, 25 Jun 2019 12:42:01 +0200
Skipping processing of scheduled tasks. Concurrency limit reached.
Skipping processing of adhoc tasks. Concurrency limit reached.
Cron script completed correctly
Cron completed at 12:42:01. Memory used 13.9Mo.
Execution took 0.133597 seconds