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page_title: Installation on CentOS page_description: Instructions for installing Docker on CentOS page_keywords: Docker, Docker documentation, requirements, linux, centos, epel, docker.io, docker-io

CentOS

The Docker package is available via the EPEL repository. These instructions work for CentOS 6 and later. They will likely work for other binary compatible EL6 distributions such as Scientific Linux, but they haven't been tested.

Please note that this package is part of Extra Packages for Enterprise Linux (EPEL), a community effort to create and maintain additional packages for the RHEL distribution.

Also note that due to the current Docker limitations, Docker is able to run only on the 64 bit architecture.

To run Docker, you will need CentOS6 or higher, with a kernel version 2.6.32-431 or higher as this has specific kernel fixes to allow Docker to run.

Installation

Firstly, you need to ensure you have the EPEL repository enabled. Please follow the EPEL installation instructions.

The docker-io package provides Docker on EPEL.

If you already have the (unrelated) docker package installed, it will conflict with docker-io. There's a bug report filed for it. To proceed with docker-io installation, please remove docker first.

Next, let's install the docker-io package which will install Docker on our host.

$ sudo yum install docker-io

Now that it's installed, let's start the Docker daemon.

$ sudo service docker start

If we want Docker to start at boot, we should also:

$ sudo chkconfig docker on

Now let's verify that Docker is working. First we'll need to get the latest centos image.

$ sudo docker pull centos:latest

Next we'll make sure that we can see the image by running:

$ sudo docker images centos

This should generate some output similar to:

$ sudo docker images centos
REPOSITORY      TAG             IMAGE ID          CREATED             VIRTUAL SIZE
centos          latest          0b443ba03958      2 hours ago         297.6 MB

Run a simple bash shell to test the image:

$ sudo docker run -i -t centos /bin/bash

If everything is working properly, you'll get a simple bash prompt. Type exit to continue.

Done! You can either continue with the Docker User Guide or explore and build on the images yourself.

Issues?

If you have any issues - please report them directly in the CentOS bug tracker.