docker on CentOS 7.0

jialiguo

　　

　　Introduction
Docker is a container-based software framework for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules.
　　Pre-Flight Check

• 　　As of June 2014 Docker has officially released v1.0.0.
  
• 　　These instructions are intended for installing Docker.
  
• 　　I’ll be working from a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.
  

　　Step 1: Installation of Docker
As a matter of best practice we’ll update our packages:
yum -y update
Now let’s install Docker by installing the docker-io package:
yum -y install docker docker-registry
　　Step 2: Start Docker and Make Sure Docker Starts on Boot
Set the Docker service to start at boot:
systemctl enable docker.service
Then start the Docker service:
systemctl start docker.service
And verify your work by checking the status of Docker:
systemctl status docker.service
　　Step 3: Download a Docker Container
Let’s begin using Docker! Download the centos Docker image:
docker pull centos
　　Step 4: Run a Docker Container
Now, to setup a basic centos container with a bash shell, we just run one command.  docker run will run a command in a new container, -i attaches stdin and stdout, -t allocates a tty, and we’re using the standard fedora container.
docker run -i -t centos /bin/bash
That’s it! You’re now using a bash shell inside of a centos docker container.
To disconnect, or detach, from the shell without exiting use the escape sequence Ctrl-p + Ctrl-q.
There are many community containers already available, which can be found through a search. In the command below I am searching for the keyword centos:
docker search centos
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