What's the network namespace in Linux? [closed]

Question

Can you tell me What's the network namespace in Linux?

And Why need network namespace in Linux?

In Linux network driver, I do not find any related about network namespace.

Is it related with network protocol in Linux?

Thanks!

Answer 1

It's related to container support (e.g. LXC). Each container is like a separate OS, like a virtualized system, but there's still only one kernel. So the kernel needs some way to separate stuff into separate namespaces per container (e.g. PID 1234 in container 1 is not the same process as PID 1234 in container 2). Network namespaces is thus the "containerization" of the network stuff.