Install Docker on CentOS 6.x

Source is From how to install docker on centos 6
In official document, docker need linux kernel up to 3.10.x
So we use this way to install docker on centos

Add the EPEL Repository

Docker is part of Extra Packages for Enterprise Linux (EPEL), which is a community repository of non-standard packages for the RHEL distribution. First, we’ll install the EPEL repository:

rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

Then, as a matter of best practice, we’ll update our packages:

yum update -y

Installation

Installation Now let’s install Docker by installing the docker-io package:

yum -y install docker-io

Once the installation completes, we’ll need to start the Docker daemon:

service docker start

And finally, and optionally, let’s configure Docker to start when the server boots:

chkconfig docker on

Docker is now installed.