$ lsb_release -a  # 需要安装 redhat-lsb-core 包

LSB Version: :core-4.1-amd64:core-4.1-noarch

Distributor ID: CentOS

Description: CentOS Linux release 7.5. (Core)

Release: 7.5.

Codename: Core

. 移除旧版本：

yum remove docker \

                  docker-client \

                  docker-client-latest \

                  docker-common \

                  docker-latest \

                  docker-latest-logrotate \

                  docker-logrotate \

                  docker-selinux \

                  docker-engine-selinux \

                  docker-engine

. 安装系统工具

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

. 添加软件源

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

. 更新 yum 缓存

yum makecache fast

. 安装docker-ce

yum -y install docker-ce

. 启动服务

systemctl enable docker.service

systemctl start docker.service
systemctl status docker.service

● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: active (running) since Tue 2019-02-19 14:32:54 CST; 15min ago
Docs: https://docs.docker.com
Main PID: 30656 (dockerd)
Tasks: 20
Memory: 58.1M
CGroup: /system.slice/docker.service
├─30656 /usr/bin/dockerd -H fd://
└─30660 containerd --config /var/run/docker/containerd/containerd.toml --log-level info

Feb 19 14:32:54 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:32:54.562741035+08:00" level=info msg="Docker daemon" commit=62...18.09.2
Feb 19 14:32:54 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:32:54.562856673+08:00" level=info msg="Daemon has completed ini...zation"
Feb 19 14:32:54 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:32:54.600567389+08:00" level=info msg="API listen on /var/run/d...r.sock"
Feb 19 14:32:54 VM_0_7_centos systemd[1]: Started Docker Application Container Engine.
Feb 19 14:33:19 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:33:19.281603981+08:00" level=info msg="shim containerd-shim sta...d=30841
Feb 19 14:33:19 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:33:19.638873050+08:00" level=info msg="shim reaped" id=ebf4c60d...3e8f83a
Feb 19 14:33:19 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:33:19.648960086+08:00" level=info msg="ignoring event" module=l...Delete"
Feb 19 14:43:24 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:43:24.662160874+08:00" level=info msg="shim containerd-shim sta...d=31842
Feb 19 14:43:25 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:43:25.061068379+08:00" level=info msg="shim reaped" id=f70bd83d...edcba6a
Feb 19 14:43:25 VM_0_7_centos dockerd[30656]: time="2019-02-19T14:43:25.071236528+08:00" level=info msg="ignoring event" module=l...Delete"
Hint: Some lines were ellipsized, use -l to show in full.

. 验证

docker run hello-world

Hello from Docker!

This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:

 . The Docker client contacted the Docker daemon.

 . The Docker daemon pulled the "hello-world" image from the Docker Hub.

    (amd64)

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

    executable that produces the output you are currently reading.

 . 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/

For more examples and ideas, visit:

 https://docs.docker.com/get-started/

yum remove docker-ce
rm -rf /var/lib/docker