1. 以 -v 启动docker 后，查看volume在host上的路径：
用awk就可以取到我们想要的路径：
2. If you need ping in the container, read this post:
Docker ubuntu ping bash not found
3. If you want to access a folder on the host from a ubuntu VM :
How to Access Folders on Your Host Machine from an Ubuntu Virtual Machine in VirtualBox
4. ubuntu 密码忘记了怎么办？
How to change root password in ubuntu?
5. pip 批量安装：
How to pip install packages according to requirements.txt from a local directory?
For virtualenv to install all files in the requirements.txt file.
- cd to the directory where requirements.txt is located
- activate your virtualenv
- run:
pip install -r requirements.txtin your shell
6.
