Unable to start docker daemon service

Hello All,

I am using docker on RHEL 7.0 with a hard drive of 500 GB with 45 GB on /, 450 on /home and 5 on swap.

After installation, docker created /dev/mapper/doc… file and also files in /var/lib/docker.

When I say #systemctl start docker, it comes out with an error saying,

don’t use loopback devices in production.

Can anyone let me know how to overcome this.
And I cannot find any docker-config files in /etc/sysconfig or other directories.
I installed using rpms from http://yum.dockerproject.org/repo/main/centos/7/Packages/ as direct internet access in not available.