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

From: Stephen Hemminger
Date: Wed Oct 22 2008 - 17:55:29 EST

On Wed, 22 Oct 2008 14:01:59 -0700
ebiederm@xxxxxxxxxxxx (Eric W. Biederman) wrote:

> "Serge E. Hallyn" <serue@xxxxxxxxxx> writes:
> > 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
> The well-known user space tools don't use /sys at all. Modern
> network tools use rtnetlink (ip) old network tools use /proc/net.
> Very few things actually use /sys and for those things lo@1 or
> eth0@1 are completely useless except for implementing a FUSE
> mock up of sysfs. But you don't need anything in sysfs to do
> that as all of the interesting information is available through
> /proc/net or rtnetlink.

Lots of scripts are starting use /sys for things. It is easier to
parse /sys/class/net than the output of ifconfig or ip
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