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在centos7上使用如下命令安装docker所需要的包失败了
```
sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2
```

失败日志如下：
```
Error: Package: 7:device-mapper-libs-1.02.135-1.el7_3.4.x86_64 (@updates)
           Requires: device-mapper = 7:1.02.135-1.el7_3.4
           Removing: 7:device-mapper-1.02.135-1.el7_3.4.x86_64 (@updates)
               device-mapper = 7:1.02.135-1.el7_3.4
           Updated By: 7:device-mapper-1.02.158-2.el7_7.2.x86_64 (updates)
               device-mapper = 7:1.02.158-2.el7_7.2
           Removing: 7:device-mapper-1.02.146-4.el7.x86_64 (installed)
               device-mapper = 7:1.02.146-4.el7
           Updated By: 7:device-mapper-1.02.158-2.el7_7.2.x86_64 (updates)
               device-mapper = 7:1.02.158-2.el7_7.2
           Available: 7:device-mapper-1.02.158-2.el7.x86_64 (os)
               device-mapper = 7:1.02.158-2.el7
 You could try using --skip-broken to work around the problem
** Found 273 pre-existing rpmdb problem(s), 'yum check' output follows:

```

# 安装基础包失败解决方法
* 使用```rpm -qa device-mapper-libs```查找安装的包
我的输出
```
device-mapper-libs-1.02.135-1.el7_3.4.x86_64
device-mapper-libs-1.02.146-4.el7.x86_64
```  
* 强制删除上面两个包
```
rpm -e --nodeps --noscripts device-mapper-libs-1.02.135-1.el7_3.4.x86_64
rpm -e --nodeps --noscripts device-mapper-libs-1.02.146-4.el7.x86_64
```
* 再次执行如下安装命令就成功了
```
sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2
```
输出如下：
```
Installed:
  lvm2.x86_64 7:2.02.185-2.el7_7.2

Dependency Installed:
  device-mapper-event.x86_64 7:1.02.158-2.el7_7.2    device-mapper-libs.x86_64 7:1.02.158-2.el7_7.2
  lvm2-libs.x86_64 7:2.02.185-2.el7_7.2

Updated:
  device-mapper-persistent-data.x86_64 0:0.8.5-1.el7         yum-utils.noarch 0:1.1.31-52.el7

Dependency Updated:
  device-mapper.x86_64 7:1.02.158-2.el7_7.2    device-mapper-event-libs.x86_64 7:1.02.158-2.el7_7.2

Complete!
```
* 设置存储仓库
```
sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
```
# 安装社区版docker引擎
```
sudo yum install docker-ce docker-ce-cli containerd.io
```
又遇到了以下问题，解决方法跟上面类似，删除了再装。
```
Error: Package: libselinux-python-2.5-6.el7.x86_64 (@anaconda)
           Requires: libselinux(x86-64) = 2.5-6.el7
           Removing: libselinux-2.5-6.el7.x86_64 (@anaconda)
               libselinux(x86-64) = 2.5-6.el7
           Updated By: libselinux-2.5-14.1.el7.x86_64 (os)
               libselinux(x86-64) = 2.5-14.1.el7
           Removing: libselinux-2.5-12.el7.x86_64 (installed)
               libselinux(x86-64) = 2.5-12.el7
           Updated By: libselinux-2.5-14.1.el7.x86_64 (os)
               libselinux(x86-64) = 2.5-14.1.el7
Error: Package: audit-2.6.5-3.el7_3.1.x86_64 (@updates)
           Requires: audit-libs(x86-64) = 2.6.5-3.el7_3.1
           Removing: audit-libs-2.6.5-3.el7_3.1.x86_64 (@updates)
               audit-libs(x86-64) = 2.6.5-3.el7_3.1
           Updated By: audit-libs-2.8.5-4.el7.x86_64 (os)
               audit-libs(x86-64) = 2.8.5-4.el7
           Removing: audit-libs-2.8.1-3.el7.x86_64 (installed)
               audit-libs(x86-64) = 2.8.1-3.el7
           Updated By: audit-libs-2.8.5-4.el7.x86_64 (os)
               audit-libs(x86-64) = 2.8.5-4.el7

```
# 启动docker，验证
````
sudo systemctl start docker
sudo docker run hello-world

Hello from Docker!
This message shows that your installation appears to be working correctly.

````

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