❯ docker exec -it c7 /bin/bash
root@c7d29c752cd0:/# ls
bin  boot  dev  docker-entrypoint-initdb.d  docker-entrypoint.sh  etc  home  lib  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@c7d29c752cd0:/# mysql -u root -p
Enter password: 1234
MariaDB [(none)]> create database sulsul

MariaDB [(none)]> show databases
    -> ;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sulsul             |
+--------------------+
4 rows in set (0.064 sec)