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[TOC]
# 一、问题现象
在 dockerfile 中使用如下命令安装 python 的第三方库
```bash
RUN pip install -r requirements.txt -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com
```
出现如下错误，但是如果手工直接在虚拟机中 ping mirrors.aliyun.com 是可以 ping 通的
```bash
Step 7/9 : RUN pip install -r requirements.txt -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com
 ---> Running in 5fbc19a84453
Looking in indexes: http://mirrors.aliyun.com/pypi/simple/
[91mWARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPConnection object at 0x7f9fa3d70970>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /pypi/simple/async-timeout/
[0m[91mWARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPConnection object at 0x7f9fa3d70460>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /pypi/simple/async-timeout/
[0m[91mWARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPConnection object at 0x7f9fa2fc64f0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /pypi/simple/async-timeout/
[0m[91mWARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPConnection object at 0x7f9fa2fc6a60>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /pypi/simple/async-timeout/
[0m[91mWARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPConnection object at 0x7f9fa2bd1220>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /pypi/simple/async-timeout/
[0m[91mERROR: Could not find a version that satisfies the requirement async-timeout==4.0.2 (from versions: none)
```
# 二、问题原因
原因是 docker 的配置文件 /etc/docker/daemon.json 中没有配置DNS

# 三、解决办法
编辑 /etc/docker/daemon.json 文件 vi /etc/docker/daemon.json，然后其中增加如下内容：
```bash
"dns": ["114.114.114.114", "8.8.8.8"]
```
如：
![](http://blog.redrose2100.com/static/upload/20220809_072548.png)

然后重启 docker 服务
```bash
systemctl restart docker
```
至此就解决了上述问题

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