oh my god, i am a retard :(
in docker you have to start cron
root@e4658ba3ec87:~/dashman/sentinel# cd ..
root@e4658ba3ec87:~/dashman# cd ..
root@e4658ba3ec87:~# cd log
root@e4658ba3ec87:~/log# ls
root@e4658ba3ec87:~/log# crontab -e
crontab: installing new crontab
root@e4658ba3ec87:~/log# ls...