github.com/fcwu/docker@v1.4.2-0.20150115145920-2a69ca89f0df/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  While the Docker package is provided by default as part of CentOS-7,
     8  it is provided by the EPEL repository for CentOS-6. Please note that
     9  this changes the installation instructions slightly between versions. If you
    10  need the latest version, you can always use the latest binary which works on
    11  kernel 3.8 and above.
    12  
    13  These instructions work for CentOS 6 and later. They will likely work for
    14  other binary compatible EL6 distributions such as Scientific Linux, but
    15  they haven't been tested.
    16  
    17  Please note that due to the current Docker limitations, Docker is able to
    18  run only on the **64 bit** architecture.
    19  
    20  To run Docker, you will need [CentOS6](http://www.centos.org) or higher,
    21  with a kernel version 2.6.32-431 or higher as this has specific kernel
    22  fixes to allow Docker to run.
    23  
    24  ## Installing Docker - CentOS-7
    25  Docker is included by default in the CentOS-Extras repository. To install
    26  simply run the following command.
    27  
    28      $ sudo yum install docker
    29  
    30  ### Manual installation of latest version
    31  
    32  While using a package is the recommended way of installing Docker,
    33  the above package might not be the latest version. If you need the latest
    34  version, [you can install the binary directly](
    35  https://docs.docker.com/installation/binaries/).
    36  
    37  When installing the binary without a package, you may want
    38  to integrate Docker with systemd. For this, simply install the two unit files
    39  (service and socket) from [the github
    40  repository](https://github.com/docker/docker/tree/master/contrib/init/systemd)
    41  to `/etc/systemd/system`.
    42  
    43  ### FirewallD
    44  
    45  CentOS-7 introduced firewalld, which is a wrapper around iptables and can
    46  conflict with Docker.
    47  
    48  When `firewalld` is started or restarted it will remove the `DOCKER` chain
    49  from iptables, preventing Docker from working properly.
    50  
    51  When using systemd, `firewalld` is started before Docker, but if you
    52  start or restart `firewalld` after Docker, you will have to restart the Docker daemon.
    53  
    54  ## Installing Docker - CentOS-6
    55  Please note that this for CentOS-6, this package is part of [Extra Packages
    56  for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL), a community effort
    57  to create and maintain additional packages for the RHEL distribution.
    58  
    59  Firstly, you need to ensure you have the EPEL repository enabled. Please
    60  follow the [EPEL installation instructions](
    61  https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F).
    62  
    63  The `docker-io` package provides Docker on EPEL.
    64  
    65  If you already have the (unrelated) `docker` package
    66  installed, it will conflict with `docker-io`.
    67  There's a [bug report](
    68  https://bugzilla.redhat.com/show_bug.cgi?id=1043676) filed for it.
    69  To proceed with `docker-io` installation, please remove `docker` first.
    70  
    71  Next, let's install the `docker-io` package which
    72  will install Docker on our host.
    73  
    74      $ sudo yum install docker-io
    75  
    76  ## Using Docker
    77  
    78  Once Docker is installed, you will need to start the docker daemon.
    79  
    80      $ sudo service docker start
    81  
    82  If we want Docker to start at boot, we should also:
    83  
    84      $ sudo chkconfig docker on
    85  
    86  Now let's verify that Docker is working. First we'll need to get the latest
    87  `centos` image.
    88  
    89      $ sudo docker pull centos
    90  
    91  Next we'll make sure that we can see the image by running:
    92  
    93      $ sudo docker images centos
    94  
    95  This should generate some output similar to:
    96  
    97      $ sudo docker images centos
    98      REPOSITORY      TAG             IMAGE ID          CREATED             VIRTUAL SIZE
    99      centos          latest          0b443ba03958      2 hours ago         297.6 MB
   100  
   101  Run a simple bash shell to test the image:
   102  
   103      $ sudo docker run -i -t centos /bin/bash
   104  
   105  If everything is working properly, you'll get a simple bash prompt. Type
   106  `exit` to continue.
   107  
   108  ## Custom daemon options
   109  
   110  If you need to add an HTTP Proxy, set a different directory or partition for the
   111  Docker runtime files, or make other customizations, read our systemd article to
   112  learn how to [customize your systemd Docker daemon options](/articles/systemd/).
   113  
   114  ## Dockerfiles
   115  The CentOS Project provides a number of sample Dockerfiles which you may use
   116  either as templates or to familiarize yourself with docker. These templates
   117  are available on github at [https://github.com/CentOS/CentOS-Dockerfiles](
   118  https://github.com/CentOS/CentOS-Dockerfiles)
   119  
   120  **Done!** You can either continue with the [Docker User
   121  Guide](/userguide/) or explore and build on the images yourself.
   122  
   123  ## Issues?
   124  
   125  If you have any issues - please report them directly in the
   126  [CentOS bug tracker](http://bugs.centos.org).