Sunday, September 7, 2014

How To Install Docker on RHEL/CentOS 7.0

Docker is a container-based software framework for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules. The major (intended) benefit of using a container is that your application will run consistently on and between any server, be it cloud or dedicated, or of varying operating systems.
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 ProFTPD:
 
systemctl status docker.service

 
Step 3: Download a Docker Container
Let’s begin using Docker! Download the fedora Docker image:
 
docker pull fedora

 
Step 4: Run a Docker Container
Now, to setup a basic fedora 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 fedora /bin/bash

That’s it! You’re now using a bash shell inside of a fedora 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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