Relevant posts
Step 0 – Prerequisites
Docker requires a 64-bit OS and version 3.10 or higher of the Linux kernel. To check your OS architecture and kernel version:
$ uname -r
The output:

Run yum packages update
$ sudo yum update
As per Docker’s website“Docker is an open platform for developers and sysadmins to build, ship, and run distributed applications, whether on laptops, data center VMs, or the cloud.”
“Operating-system-level virtualization is a server-virtualization method where the kernel of an operating system allows for multiple isolated user-space instances, instead of just one. Such instances (sometimes called containers, software containers, virtualization engines (VE), virtual private servers (VPS), or jails) may look and feel like a real server from the point of view of its owners and users.”