linux 网络虚拟化： network namespace 简介

参考资料：

https://cizixs.com/2017/02/10/network-virtualization-network-namespace/

https://blog.kghost.info/2013/03/01/linux-network-emulator/

https://blog.scottlowe.org/2013/09/04/introducing-linux-network-namespaces/