Docker build 里的pip install 执行不成功

Dockerfile 里的 pip install 总是failed .但是直接执行可以成功。
估计是docker build 时默认使用的pip 源有太慢导致

### Dockerfile 里涉及的报错语句
```
RUN pip install networkx 
```

### 报错如下
```
Step 9/15 : RUN pip install networkx
 ---> Running in 3a3f19067b2f
Collecting networkx
 Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed ox/
 Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed ox/
 Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed ox/
 Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed ox/
 Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed ox/
 Could not find a version that satisfies the requirement networkx (from versions: )
No matching distribution found for networkx
The command '/bin/sh -c pip install networkx' returned a non-zero code: 1
```

### 修改pip源为国内源
```
RUN pip install networkx -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
```
### 再执行
```
root@vm1:/vob/DIBENV# docker build .
Sending build context to Docker daemon 1.19GB
Step 1/15 : FROM ubuntu:bionic AS DIB-env
 ---> d27b9ffc5667
.......
 ---> Using cache
 ---> 5cf17f5d5e70
Step 8/15 : RUN pip install --upgrade pip
 ---> Using cache
 ---> 12c35687d374
Step 9/15 : RUN pip install networkx -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
 ---> Running in 82c268720751
Collecting networkx
 Downloading http://pypi.doubanio.com/packages/f3/f4/7e20ef40b118478191cec0b58c3192f822cace858c19505c7670961b76b2/networkx-2.2.zip (1.7MB)
Collecting decorator>=4.3.0 (from networkx)
 Downloading http://pypi.doubanio.com/packages/ed/1b/72a1821152d07cf1d8b6fce298aeb06a7eb90f4d6d41acec9861e7cc6df0/decorator-4.4.2-py2.py3-none-any.whl
Building wheels for collected packages: networkx
 Running setup.py bdist_wheel for networkx: started
 Running setup.py bdist_wheel for networkx: finished with status 'done'
 Stored in directory: /root/.cache/pip/wheels/62/82/57/fc7b6a6eea7339f4b1a1728e8e434a0121f9320b9b060a60dc
Successfully built networkx
Installing collected packages: decorator, networkx
Successfully installed decorator-4.4.2 networkx-2.2

```

### 常用 pip 国内源备用
阿里云 
http://mirrors.aliyun.com/pypi/simple/

豆瓣(douban) 
http://pypi.douban.com/simple/

### 用法 
在原来的pip install software 语句后面 加上 -i 和 --trusted-host
-i http://pypi.douban.com/simple --trusted-host pypi.douban.com

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