Docker CE 支持 64 位版本 CentOS 7，并且要求内核版本不低于 3.10。
卸载旧版本
旧版本的 Docker 称为 docker 或者 docker-engine ，使用以下命令卸载旧版本：
$ 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
使用 yum 安装
执行以下命令安装依赖包：
$ sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2
鉴于国内网络问题，强烈建议使用国内源，官方源请在注释中查看。
执行下面的命令添加 yum 软件源：
$ sudo yum-config-manager \ --add-repo \ https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo # 官方源 # $ sudo yum-config-manager \ # --add-repo \ # https://download.docker.com/linux/centos/docker-ce.repo
如果需要最新版本的 Docker CE 请使用以下命令：
$ sudo yum-config-manager --enable docker-ce-edge
安装 Docker CE
更新 yum 软件源缓存，并安装 docker-ce 。
$ sudo yum makecache fast $ sudo yum install docker-ce
启动 Docker CE
$ sudo systemctl enable docker $ sudo systemctl start docker
测试 Docker 是否安装正确
$ docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world ca4f61b1923c: Pull complete Digest: sha256:be0cd392e45be79ffeffa6b05338b98ebb16c87b255f48e297ec7f98e123905c Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://cloud.docker.com/ For more examples and ideas, visit: https://docs.docker.com/engine/userguide/
若能正常输出以上信息，则说明安装成功。
镜像加速
