头像 Get Docker CE for CentOS 2018年12月11日

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-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-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 usersset 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 andinstall 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.

  • In testing and development environments, some users choose to use automatedconvenience scripts to install Docker.

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-managerutility, and device-mapper-persistent-data and lvm2 are required by thedevicemapper 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 theedge or test repositories as well.

    $ sudo yum-config-manager \
        --add-repo \
        https://download.docker.com/linux/centos/docker-ce.repo
  3. Optional: Enable the edge and test 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-test

    You can disable the edge or test repository by running theyum-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 test repositories.

    Learn about stable and edge builds.

Install Docker CE

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

    $ sudo yum install docker-ce

    If prompted to accept the GPG key, verify that the fingerprint matches060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35, and if so, accept it.

    Got multiple Docker repositories?

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

    Docker is installed but not started. The docker group is created, but no users are added to the group.

  2. To install a specific version of Docker CE, list the available versions in the repo, then select and install:

    a. List and sort the versions available in your repo. This example sorts   results by version number, highest to lowest, and is truncated:

    $ yum list docker-ce --showduplicates | sort -rdocker-ce.x86_64            18.09.0.ce-1.el7.centos             docker-ce-stable

    The list returned depends on which repositories are enabled, and is specific to your version of CentOS (indicated by the .el7 suffix in this example).

    b. Install a specific version by its fully qualified package name, which is   the package name (docker-ce) plus the version string (2nd column) up to   the first hyphen, separated by a hyphen (-), for example,   docker-ce-18.03.0.ce.

    $ sudo yum install docker-ce-<VERSION STRING>

    Docker is installed but not started. The docker group is created, but no users are added to the group.

  3. Start Docker.

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

    $ 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, follow theinstallation instructions, choosing the new version you want to install.


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