Re: [PATCH 0/4][RFC] netns: sysfs: add a netns suffix to netdevice sysfs entries

From: Serge E. Hallyn
Date: Wed Oct 22 2008 - 16:31:25 EST

Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
> Benjamin Thery <benjamin.thery@xxxxxxxx> writes:
> > Support for network namespaces in mainline is pretty complete for
> > some time now, but there is still this issue with sysfs that prevents
> > more people to use it easily.
> Ben your patchset is completely inappropriate.
> Temporarily adding elements to the ABI that we intend to remove
> is not a proper solution to this problem.
> That user space visible ida you add is a namespace identifier that breaks
> nested containers and migration. It is very very very wrong.

I disagree (not surprising :) completely. The well-known userspace
tools (ifconfig, ip, etc) will not see the lo@1, they'll see lo.
Userspace in a container can either umount /sys completely, or do

mount -t tmpfs none /sys/class/net
mount --bind /sys/devices/virtual/net/lo@1 /sys/class/net/lo

if they really want to, in which case only their view
of /sys/devices/virtual/net would be different.

Eric, would you hate this less if it was under some


config variable?

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