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Signed-off-by: Megan Kostick <mkostick@us.ibm.com>
158 lines
5.2 KiB
Markdown
158 lines
5.2 KiB
Markdown
page_title: Installation on CentOS
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page_description: Instructions for installing Docker on CentOS
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page_keywords: Docker, Docker documentation, requirements, linux, centos, epel, docker.io, docker-io
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# CentOS
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Docker is supported on the following versions of CentOS:
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- [*CentOS 7 (64-bit)*](#installing-docker-centos-7)
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- [*CentOS 6.5 (64-bit)*](#installing-docker-centos-6.5) or later
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These instructions are likely work for other binary compatible EL6/EL7 distributions
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such as Scientific Linux, but they haven't been tested.
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Please note that due to the current Docker limitations, Docker is able to
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run only on the **64 bit** architecture.
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## Kernel support
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Currently the CentOS project will only support Docker when running on kernels
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shipped by the distribution. There are kernel changes which will cause issues
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if one decides to step outside that box and run non-distribution kernel packages.
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To run Docker on [CentOS-6.5](http://www.centos.org) or later, you will need
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kernel version 2.6.32-431 or higher as this has specific kernel fixes to allow
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Docker to run.
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## CentOS-7
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### Installation
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Docker is included by default in the CentOS-Extras repository. To install
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run the following command:
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$ sudo yum install docker
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Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
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### Uninstallation
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To uninstall the Docker package:
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$ sudo yum -y remove docker
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The above command will not remove images, containers, volumes, or user created
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configuration files on your host. If you wish to delete all images, containers,
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and volumes run the following command:
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$ rm -rf /var/lib/docker
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You must delete the user created configuration files manually.
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## CentOS-6.5
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### Installation
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For CentOS-6.5, the Docker package is part of [Extra Packages
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for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL) repository,
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a community effort to create and maintain additional packages for the RHEL distribution.
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Firstly, you need to ensure you have the EPEL repository enabled. Please
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follow the [EPEL installation instructions](
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https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F).
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For CentOS-6, there is a package name conflict with a system tray application
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and its executable, so the Docker RPM package was called `docker-io`.
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To proceed with `docker-io` installation on CentOS-6, you may need to remove the
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`docker` package first.
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$ sudo yum -y remove docker
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Next, let's install the `docker-io` package which will install Docker on our host.
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$ sudo yum install docker-io
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Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
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### Uninstallation
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To uninstall the Docker package:
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$ sudo yum -y remove docker-io
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The above command will not remove images, containers, volumes, or user created
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configuration files on your host. If you wish to delete all images, containers,
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and volumes run the following command:
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$ rm -rf /var/lib/docker
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You must delete the user created configuration files manually.
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## Manual installation of latest Docker release
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While using a package is the recommended way of installing Docker,
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the above package might not be the current release version. If you need the latest
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version, [you can install the binary directly](
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https://docs.docker.com/installation/binaries/).
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When installing the binary without a package, you may want
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to integrate Docker with Systemd. For this, install the two unit files
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(service and socket) from [the GitHub
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repository](https://github.com/docker/docker/tree/master/contrib/init/systemd)
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to `/etc/systemd/system`.
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Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
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## Starting the Docker daemon
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Once Docker is installed, you will need to start the docker daemon.
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$ sudo service docker start
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If we want Docker to start at boot, we should also:
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$ sudo chkconfig docker on
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Now let's verify that Docker is working. First we'll need to get the latest
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`centos` image.
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$ sudo docker pull centos
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Next we'll make sure that we can see the image by running:
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$ sudo docker images centos
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This should generate some output similar to:
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$ sudo docker images centos
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REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
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centos latest 0b443ba03958 2 hours ago 297.6 MB
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Run a simple bash shell to test the image:
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$ sudo docker run -i -t centos /bin/bash
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If everything is working properly, you'll get a simple bash prompt. Type
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`exit` to continue.
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## Custom daemon options
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If you need to add an HTTP Proxy, set a different directory or partition for the
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Docker runtime files, or make other customizations, read our Systemd article to
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learn how to [customize your Systemd Docker daemon options](/articles/systemd/).
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## Dockerfiles
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The CentOS Project provides a number of sample Dockerfiles which you may use
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either as templates or to familiarize yourself with docker. These templates
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are available on GitHub at [https://github.com/CentOS/CentOS-Dockerfiles](
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https://github.com/CentOS/CentOS-Dockerfiles)
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**Done!** You can either continue with the [Docker User
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Guide](/userguide/) or explore and build on the images yourself.
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## Issues?
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If you have any issues - please report them directly in the
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[CentOS bug tracker](http://bugs.centos.org).
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