#daily tips# For docker run DON'T USE -it flag
(as said BMitch)

And it's not exactly what you are asking, but would be also useful for others:

For docker-compose exec use -T flag!
The -T key would help people who are using docker-compose exec! (It disable pseudo-tty allocation)

For example:

docker-compose -f /srv/backend_bigdata/local.yml exec -T postgres backup
or

docker-compose exec -T mysql mysql -uuser_name -ppassword database_name < dir/to/db_backup.sql