Terminal 1:
docker-compose up --build # start service
Terminal 2:
docker-compose exec db bash # connect to container
mysql -u user --database db -p # login
select * from customer;
# or from client container:
docker-compose exec client bash
mysql -u user --database db -h db -p # and insert "passwd"
Connect to adminer web console: http://localhost:8888/?server=db&username=user&db=db