How to restart mysql after Error establishing a database connection Easyengine V4


I dont know how to restart mysql normally on v3 service mysql restart and fixed but v4 I dont know systen return =>failed to restart mysql.service and everythime I have this error " Error establishing a database connection"
when I use easyengine v4 what can I do?


try ee site restart --db


root@av:~# ee site restart --db
Restarting db
No such service: db


I dont know its not working but nginx and php restart but db is not restart why I dont understand?


v4 using docker you can restart docker
you can read documents here