docker run -d has container status a 'exited'

Hi All,
I executed the below :
docker pull rhscl/mysql-57-rhel7
docker run -d

the container's status is shown as 'exited > seconds ago'
Ideally the container should be up and running in background, why is it getting exited? can someone please help me with this?
Thanks in advance.

Regards,
Kavya