Linux(CentOS) 安装 Docker

文章地址：https://docs.docker.com/install/linux/docker-ce/centos/#install-docker-ce

Install Docker CE

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-dataand lvm2 are required by the devicemapper storage driver.

   $ sudo yum install -y yum-utils
   
   $ sudo yum install device-mapper-persistent-data
   
   $ sudo yum install lvm2

2. Use the following command to set up the stable repository.

   $ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

INSTALL DOCKER CE

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

   $ sudo yum install docker-ce docker-ce-cli containerd.io

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 -r
   
   docker-ce.x86_64  3:18.09.1-3.el7                     docker-ce-stable
   docker-ce.x86_64  3:18.09.0-3.el7                     docker-ce-stable
   docker-ce.x86_64  18.06.1.ce-3.el7                    docker-ce-stable
   docker-ce.x86_64  18.06.0.ce-3.el7                    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) starting at the first colon (:), up to the first hyphen, separated by a hyphen (-). For example, docker-ce-18.09.1.

   $ sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io

   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 CE is installed correctly by running the hello-world image.

   $ sudo docker run hello-world