一、安装docker

1.更新yum源,更新到最新(也可不更)

[root@localhost ~]# yum update
已加载插件:fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * extras: mirrors.aliyun.com
 * updates: centos.ustc.edu.cn
正在解决依赖关系
--> 正在检查事务
---> 软件包 bind-libs.x86_64.32.9.9.4-61.el7 将被 升级
---> 软件包 bind-libs.x86_64.32.9.9.4-61.el7_5.1 将被 更新
---> 软件包 bind-libs-lite.x86_64.32.9.9.4-61.el7 将被 升级
---> 软件包 bind-libs-lite.x86_64.32.9.9.4-61.el7_5.1 将被 更新
---> 软件包 bind-license.noarch.32.9.9.4-61.el7 将被 升级
---> 软件包 bind-license.noarch.32.9.9.4-61.el7_5.1 将被 更新
...
...
验证中 : 32:bind-license-9.9.4-61.el7.noarch 8/8
更新完毕:
bind-libs.x86_64 32:9.9.4-61.el7_5.1 
bind-libs-lite.x86_64 32:9.9.4-61.el7_5.1 
bind-license.noarch 32:9.9.4-61.el7_5.1 
bind-utils.x86_64 32:9.9.4-61.el7_5.1
完毕!
[root@localhost ~]#

2.安装需要的依赖软件包,yum-util 提供yum-config-manager功能,另外两个是devicemapper驱动依赖的

[root@localhost ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
已加载插件:fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * extras: mirrors.aliyun.com
 * updates: centos.ustc.edu.cn
...

3.设置yum源

[root@localhost ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
已加载插件:fastestmirror, langpacks
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo

4.可以查看所有仓库所有docker版本,选择特定版本进行安装

[root@localhost ~]# yum list docker-ce --showduplicates | sort -r
已加载插件:fastestmirror, langpacks
可安装的软件包
 * updates: centos.ustc.edu.cn
Loading mirror speeds from cached hostfile
 * extras: mirrors.aliyun.com
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
...

5.安装docker,在这里我选择的是17.12.1.ce

[root@localhost ~]# yum install docker-ce-17.12.1.ce
已加载插件:fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * extras: mirrors.aliyun.com
 * updates: centos.ustc.edu.cn
base                                                   | 3.6 kB     00:00     
docker-ce-stable                                       | 2.9 kB     00:00     
extras                                                 | 3.4 kB     00:00     
updates                                                | 3.4 kB     00:00     
正在解决依赖关系
--> 正在检查事务
---> 软件包 docker-ce.x86_64.0.17.12.1.ce-1.el7.centos 将被 安装
--> 正在处理依赖关系 container-selinux >= 2.9,它被软件包 docker-ce-17.12.1.ce-1.el7.centos.x86_64 需要
...

6.启动docker,加入开机启动

[root@localhost ~]# systemctl start docker
[root@localhost ~]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

7.查看版本是否成功安装

[root@localhost ~]# docker version 
Client:
 Version:    17.12.1-ce
 API version:    1.35
 Go version:    go1.9.4
 Git commit:    7390fc6
 Built:    Tue Feb 27 22:15:20 2018
 OS/Arch:    linux/amd64
Server:
 Engine:
  Version:    17.12.1-ce
  API version:    1.35 (minimum version 1.12)
  Go version:    go1.9.4
  Git commit:    7390fc6
  Built:    Tue Feb 27 22:17:54 2018
  OS/Arch:    linux/amd64
  Experimental:    false

二、卸载docker

1.查询docker安装过的包

[root@localhost ~]#yum list installed | grep docker
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
docker.x86_64                        2:1.13.1-53.git774336d.el7.centos @extras  
docker-client.x86_64                 2:1.13.1-53.git774336d.el7.centos @extras  
docker-common.x86_64                 2:1.13.1-53.git774336d.el7.centos @extras

2.卸载安装包

[root@localhost ~]#yum –y remove docker.x86_64
[root@localhost ~]#yum –y remove docker-client.x86_64
[root@localhost ~]#yum –y remove docker-common.x86_64

3.删除镜像、容器等

[root@localhost ~]#rm -rf /var/lib/docker

4.再次检查docker是否成功卸载

[root@localhost ~]#dokcer 

如果没有搜索到,那么表示已经卸载成功。

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