本文档介绍检查Docker版本，重装Docker，给有需要有朋友提供参考。
检查 Docker 版本
[root@Docker ]# docker version
Client: Docker Engine - Community
Version: 19.03.8
API version: 1.40
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:27:04 2020
OS/Arch: linux/amd64
Experimental: false

Server: Docker Engine - Community
Engine:
Version: 19.03.8
API version: 1.40 (minimum version 1.12)
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:25:42 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683
查看所有仓库中所有docker版本,并选择特定的版本安装
[root@Docker ]# yum list docker-ce --showduplicates | sort -r

• updates: mirrors.aliyun.com
  Loading mirror speeds from cached hostfile

Loaded plugins: fastestmirror

• extras: mirrors.ustc.edu.cn
• epel: hkg.mirror.rackspace.com
  docker-ce.x86_64 3:19.03.8-3.el7 docker-ce-stable

docker-ce.x86_64 3:19.03.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.0-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.9-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.8-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable
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 18.06.3.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.2.ce-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
docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.12.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.09.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.09.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.2.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.3.ce-1.el7 docker-ce-stable
docker-ce.x86_64 17.03.2.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable

• base: mirrors.aliyun.com
  Available Packages

重装 Docker
安装 docker-ce-18.06.0.ce
[root@Docker ]# yum remove docker docker-common docker-selinux docker-engine -y
[root@Docker ]# yum install -y docker-ce-18.06.0.ce
可能会遇到的报错
file /usr/share/zsh/vendor-completions/_docker from install of docker-ce-18.06.0.ce-3.el7.x86_64 conflicts with file from package docker-ce-cli-1:19.03.8-3.el7.x86_64

Error Summary
解决方法
卸载 docker-ce-cli-1:19.03.8-3.el7.x86_64 -y

[root@Docker ]# yum erase docker-ce-cli-1:19.03.8-3.el7.x86_64 -y
再次安装 docker-ce-18.06.0.ce

[root@Docker ]# yum install -y docker-ce-18.06.0.ce
[root@Docker ]# systemctl start docker
[root@Docker ]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@Docker ]# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/docker.service.d

       └─kolla.conf

Active: active (running) since Mon 2020-03-30 14:25:00 EDT; 24s ago

 Docs: https://docs.docker.com

Main PID: 21775 (dockerd)
CGroup: /system.slice/docker.service

       ├─21775 /usr/bin/dockerd
       └─21782 docker-containerd --config /var/run/docker/containe...

Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack dockerd[21775 ]: time="2020-0...
Mar 30 14:25:00 openstack systemd[1 ]: Started Docker A...
Hint: Some lines were ellipsized, use -l to show in full.
查看 Docker 版本信息

[root@Docker ~]# docker --version
Docker version 18.06.0-ce, build 0ffa825
[root@Docker ~]# docker version
Client:
Version: 18.06.0-ce
API version: 1.38
Go version: go1.10.3
Git commit: 0ffa825
Built: Wed Jul 18 19:08:18 2018
OS/Arch: linux/amd64
Experimental: false

Server:
Engine:
Version: 18.06.0-ce
API version: 1.38 (minimum version 1.12)
Go version: go1.10.3
Git commit: 0ffa825
Built: Wed Jul 18 19:10:42 2018
OS/Arch: linux/amd64
Experimental: false
总结
至此，docker-ce-18.06.0.ce 安装成功！想看 Docker 后续操作的朋友，请持续关注我的文章，希望我的文章能给大家带来帮助。