github.com/guilhermebr/docker@v1.4.2-0.20150428121140-67da055cebca/docs/sources/installation/centos.md (about)

     1  page_title: Installation on CentOS
     2  page_description: Instructions for installing Docker on CentOS
     3  page_keywords: Docker, Docker documentation, requirements, linux, centos, epel, docker.io, docker-io
     4  
     5  # CentOS
     6  
     7  Docker is supported on the following versions of CentOS:
     8  
     9  - [*CentOS 7 (64-bit)*](#installing-docker-centos-7)
    10  - [*CentOS 6.5 (64-bit)*](#installing-docker-centos-6.5) or later
    11  
    12  These instructions are likely work for other binary compatible EL6/EL7 distributions
    13  such as Scientific Linux, but they haven't been tested.
    14  
    15  Please note that due to the current Docker limitations, Docker is able to
    16  run only on the **64 bit** architecture.
    17  
    18  ## Kernel support
    19  
    20  Currently the CentOS project will only support Docker when running on kernels
    21  shipped by the distribution. There are kernel changes which will cause issues
    22  if one decides to step outside that box and run non-distribution kernel packages.
    23  
    24  To run Docker on [CentOS-6.5](http://www.centos.org) or later, you will need
    25  kernel version 2.6.32-431 or higher as this has specific kernel fixes to allow
    26  Docker to run.
    27  
    28  ## Installing Docker - CentOS-7
    29  Docker is included by default in the CentOS-Extras repository. To install
    30  run the following command:
    31  
    32      $ sudo yum install docker
    33  
    34  Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
    35  
    36  ## Installing Docker - CentOS-6.5
    37  
    38  For CentOS-6.5, the Docker package is part of [Extra Packages
    39  for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL) repository,
    40  a community effort to create and maintain additional packages for the RHEL distribution.
    41  
    42  Firstly, you need to ensure you have the EPEL repository enabled. Please
    43  follow the [EPEL installation instructions](
    44  https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F).
    45  
    46  For CentOS-6, there is a package name conflict with a system tray application
    47  and its executable, so the Docker RPM package was called `docker-io`.
    48  
    49  To proceed with `docker-io` installation on CentOS-6, you may need to remove the
    50  `docker` package first.
    51  
    52      $ sudo yum -y remove docker
    53  
    54  Next, let's install the `docker-io` package which will install Docker on our host.
    55  
    56      $ sudo yum install docker-io
    57  
    58  Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
    59  
    60  ## Manual installation of latest Docker release
    61  
    62  While using a package is the recommended way of installing Docker,
    63  the above package might not be the current release version. If you need the latest
    64  version, [you can install the binary directly](
    65  https://docs.docker.com/installation/binaries/).
    66  
    67  When installing the binary without a package, you may want
    68  to integrate Docker with Systemd. For this, install the two unit files
    69  (service and socket) from [the GitHub
    70  repository](https://github.com/docker/docker/tree/master/contrib/init/systemd)
    71  to `/etc/systemd/system`.
    72  
    73  Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
    74  
    75  ## Starting the Docker daemon
    76  
    77  Once Docker is installed, you will need to start the docker daemon.
    78  
    79      $ sudo service docker start
    80  
    81  If we want Docker to start at boot, we should also:
    82  
    83      $ sudo chkconfig docker on
    84  
    85  Now let's verify that Docker is working. First we'll need to get the latest
    86  `centos` image.
    87  
    88      $ sudo docker pull centos
    89  
    90  Next we'll make sure that we can see the image by running:
    91  
    92      $ sudo docker images centos
    93  
    94  This should generate some output similar to:
    95  
    96      $ sudo docker images centos
    97      REPOSITORY      TAG             IMAGE ID          CREATED             VIRTUAL SIZE
    98      centos          latest          0b443ba03958      2 hours ago         297.6 MB
    99  
   100  Run a simple bash shell to test the image:
   101  
   102      $ sudo docker run -i -t centos /bin/bash
   103  
   104  If everything is working properly, you'll get a simple bash prompt. Type
   105  `exit` to continue.
   106  
   107  ## Custom daemon options
   108  
   109  If you need to add an HTTP Proxy, set a different directory or partition for the
   110  Docker runtime files, or make other customizations, read our Systemd article to
   111  learn how to [customize your Systemd Docker daemon options](/articles/systemd/).
   112  
   113  ## Dockerfiles
   114  The CentOS Project provides a number of sample Dockerfiles which you may use
   115  either as templates or to familiarize yourself with docker. These templates
   116  are available on GitHub at [https://github.com/CentOS/CentOS-Dockerfiles](
   117  https://github.com/CentOS/CentOS-Dockerfiles)
   118  
   119  **Done!** You can either continue with the [Docker User
   120  Guide](/userguide/) or explore and build on the images yourself.
   121  
   122  ## Issues?
   123  
   124  If you have any issues - please report them directly in the
   125  [CentOS bug tracker](http://bugs.centos.org).