# uname -r

$ dudo yum update

$ sudo tee /etc/yum.repos.d/docker.repo <<-'EOF'

[dockerrepo]

name=Docker Repository

baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/

enabled=

gpgcheck=

gpgkey=https://yum.dockerproject.org/gpg

EOF

$ sudo yum install docker-engine

$ sudo service docker start

$ sudo docker run hello-world

Unable to find image 'hello-world:latest' locally

    latest: Pulling from hello-world

    a8219747be10: Pull complete

    91c95931e552: Already exists

    hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.

    Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd1..1cf5daeb82aab55838d

    Status: Downloaded newer image for hello-world:latest

    Hello from Docker.

    This message shows that your installation appears to be working correctly.

    To generate this message, Docker took the following steps:

     . The Docker client contacted the Docker daemon.

     . The Docker daemon pulled the "hello-world" image from the Docker Hub.

            (Assuming it was not already locally available.)

     . The Docker daemon created a new container from that image which runs the

            executable that produces the output you are currently reading.

     . The Docker daemon streamed that output to the Docker client, which sent it

            to your terminal.

    To try something more ambitious, you can run an Ubuntu container with:

     $ docker run -it ubuntu bash

    For more examples and ideas, visit:

     http://docs.docker.com/userguide/

$ sudo yum update

$ curl -fsSL https://get.docker.com/ | sh

$ sudo service docker start

$ sudo docker run hello-world