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moby--moby/docs/sources/installation/centos.md
James Turnbull a7b2c4804b Adding User Guide
* Added User Guide section outlines.
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* Updated Introduction to add User Guide.
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Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
2014-06-01 17:34:07 -04:00

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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)](https://fedoraproject.org/wiki/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](http://www.centos.org) 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](
https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F).
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](
https://bugzilla.redhat.com/show_bug.cgi?id=1043676) 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](/userguide/) or explore and build on the images yourself.
## Issues?
If you have any issues - please report them directly in the
[CentOS bug tracker](http://bugs.centos.org).