Docker container will automatically stop after docker run -d

Question

According to the tutorials I've read so far, using "docker run -d" will start a container from an image and execute it in the background. 

This is how it appears; we can see that we already have a container id.

root@docker:/home/root# docker run -d centos
605e3928cdddb844526bab691af51d0c9262e0a1fc3d41de3f59be1a58e1bd1d

But if I ran "docker ps", nothing was returned.

So I tried "docker ps -a" and saw that the container had already exited:

root@docker:/home/root# docker ps -a
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS                         PORTS               NAMES
605e3928cddd        centos:latest         "/bin/bash"         31 minutes ago      Exited (0) 31 minutes ago                          kickass_swartz

Is there anything I did wrong? How can I resolve this problem?