以下操作均基于CentOS 7.6进行

安装&卸载

1. 卸载旧版本

yum remove docker \
    docker-client \
    docker-client-latest \
    docker-common \
    docker-latest \
    docker-latest-logrotate \
    docker-logrotate \
    docker-engine

2. 安装所需软件包

yum install -y yum-utils

3. 设置stable镜像

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

4. 更新索引

yum makecache fast

5. 安装Docker ce

yum -y install docker-ce docker-ce-cli containerd.io

安装完毕后可以使用命令systemctl enable docker设置开机自启动；使用命令systemctl start docker启动Docker

6.版本查看

安装完成后可以使用命令docker version来查看所安装Docker的版本信息

7. 镜像

7.1 配置镜像加速器

可以通过修改daemon配置文件(/etc/docker/daemon.json)来使用加速器

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF' {   "registry-mirrors": ["https://r4s7f8dr.mirror.aliyuncs.com"] } EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

7.2 拉取hello-world镜像

拉取官网hello-world镜像来检测docker是否安装无误，使用命令docker pull hello-world

7.3 运行hello-world镜像

使用命令docker run hello-world，如果输出以下信息表明镜像运行正常：

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)

  1. The Docker daemon created a new container from that image which runs the

    executable that produces the output you are currently reading.

  1. 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://hub.docker.com/](https://hub.docker.com/)

For more examples and ideas, visit:

  [https://docs.docker.com/get-started/](https://docs.docker.com/get-started/)