Get Docker CE for CentOS

Estimated reading time: 7 minutes

To get started with Docker CE on CentOS, make sure you meet the prerequisites, then install Docker.

Prerequisites

Docker EE customers

To install Docker Enterprise Edition (Docker EE), go to Get Docker EE for CentOS instead of this topic.

To learn more about Docker EE, see Docker Enterprise Edition.

OS requirements

To install Docker CE, you need the 64-bit version of CentOS 7.

Uninstall old versions

Older versions of Docker were called docker or docker-engine. If these are installed, uninstall them, along with associated dependencies.

$ sudo yum remove docker \
                  docker-common \
                  docker-selinux \
                  docker-engine

It’s OK if yum reports that none of these packages are installed.

The contents of /var/lib/docker/, including images, containers, volumes, and networks, are preserved. The Docker CE package is now called docker-ce.

Install Docker CE

You can install Docker CE in different ways, depending on your needs:

  • Most users set up Docker’s repositories and install from them, for ease of installation and upgrade tasks. This is the recommended approach.

  • Some users download the RPM package and install it manually and manage upgrades completely manually. This is useful in situations such as installing Docker on air-gapped systems with no access to the internet.

Install using the repository

Before you install Docker CE for the first time on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from the repository.

Set up the repository

  1. Install required packages. yum-utils provides the yum-config-manager utility, and device-mapper-persistent-data and lvm2 are required by the devicemapper storage driver.

    $ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
    
  2. Use the following command to set up the stable repository. You always need the stable repository, even if you want to install builds from the edge or testing repositories as well.

    $ sudo yum-config-manager \
        --add-repo \
        https://download.docker.com/linux/centos/docker-ce.repo
    
  3. Optional: Enable the edge and testing repositories. These repositories are included in the docker.repo file above but are disabled by default. You can enable them alongside the stable repository.

    $ sudo yum-config-manager --enable docker-ce-edge
    
    $ sudo yum-config-manager --enable docker-ce-testing
    

    You can disable the edge or testing repository by running the yum-config-manager command with the --disable flag. To re-enable it, use the --enable flag. The following command disables the edge repository.

    $ sudo yum-config-manager --disable docker-ce-edge
    

    Note: Starting with Docker 17.06, stable releases are also pushed to the edge and testing repositories.

    Learn about stable and edge builds.

Install Docker CE

  1. Update the yum package index.

    $ sudo yum makecache fast
    

    If this is the first time you have refreshed the package index since adding the Docker repositories, you will be prompted to accept the GPG key, and the key’s fingerprint will be shown. Verify that the fingerprint is correct, and if so, accept the key. The fingerprint should match 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35.

  2. Install the latest version of Docker CE, or go to the next step to install a specific version.

    $ sudo yum install docker-ce
    

    Warning: If you have multiple Docker repositories enabled, installing or updating without specifying a version in the yum install or yum update command will always install the highest possible version, which may not be appropriate for your stability needs.

  3. On production systems, you should install a specific version of Docker CE instead of always using the latest. List the available versions. This example uses the sort -r command to sort the results by version number, highest to lowest, and is truncated.

    Note: This yum list command only shows binary packages. To show source packages as well, omit the .x86_64 from the package name.

    $ yum list docker-ce.x86_64  --showduplicates | sort -r
    
    docker-ce.x86_64  17.06.0.el7                               docker-ce-stable  
    

    The contents of the list depend upon which repositories are enabled, and will be specific to your version of CentOS (indicated by the .el7 suffix on the version, in this example). Choose a specific version to install. The second column is the version string. The third column is the repository name, which indicates which repository the package is from and by extension its stability level. To install a specific version, append the version string to the package name and separate them by a hyphen (-):

    $ sudo yum install docker-ce-<VERSION>
    
  4. Start Docker.

    $ sudo systemctl start docker
    
  5. Verify that docker is installed correctly by running the hello-world image.

    $ sudo docker run hello-world
    

    This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

Docker CE is installed and running. You need to use sudo to run Docker commands. Continue to Linux postinstall to allow non-privileged users to run Docker commands and for other optional configuration steps.

Upgrade Docker CE

To upgrade Docker CE, first run sudo yum makecache fast, then follow the installation instructions, choosing the new version you want to install.

Install from a package

If you cannot use Docker’s repository to install Docker, you can download the .rpm file for your release and install it manually. You will need to download a new file each time you want to upgrade Docker.

  1. Go to https://download.docker.com/linux/centos/7/x86_64/stable/Packages/ and download the .rpm file for the Docker version you want to install.

    Note: To install an edge package, change the word stable in the > URL to edge. Learn about stable and edge channels.

  2. Install Docker CE, changing the path below to the path where you downloaded the Docker package.

    $ sudo yum install /path/to/package.rpm
    
  3. Start Docker.

    $ sudo systemctl start docker
    
  4. Verify that docker is installed correctly by running the hello-world image.

    $ sudo docker run hello-world
    

    This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

Docker CE is installed and running. You need to use sudo to run Docker commands. Continue to Post-installation steps for Linux to allow non-privileged users to run Docker commands and for other optional configuration steps.

Upgrade Docker CE

To upgrade Docker CE, download the newer package file and repeat the installation procedure, using yum -y upgrade instead of yum -y install, and pointing to the new file.

Uninstall Docker CE

  1. Uninstall the Docker package:

    $ sudo yum remove docker-ce
    
  2. Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes:

    $ sudo rm -rf /var/lib/docker
    

You must delete any edited configuration files manually.

Next steps

requirements, apt, installation, centos, rpm, install, uninstall, upgrade, update