Activate netns

Activate netns

[Peter Fassberg]

Hi!

I have trouble to activate netns on OpenWrt with kernel 3.8.13.

I get this:

root@ROOter:~# ip netns show
root@ROOter:~# ip netns add blue
Failed to create a new network namespace "blue": Invalid argument
root@ROOter:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                   48377     10493     37884  22% /
/dev/root                48377     10493     37884  22% /
tmpfs                   257036      2264    254772   1% /tmp
tmpfs                      512         0       512   0% /dev
/dev/sda2                 4088      2266      1618  58% /mnt
/dev/sda1                 4088      2266      1618  58% /mnt
tmpfs                   257036      2264    254772   1% /tmp/run/netns
root@ROOter:~# uname -a
Linux ROOter 3.8.13 #2 Wed Mar 26 21:39:04 CET 2014 i686 GNU/Linux
root@ROOter:~#


Any hints on what I'm missing?



Regards,

// Peter

Re: Activate netns

[Nicolas Dichtel]

Le 27/03/2014 15:51, Peter Fassberg a écrit :
>
> Hi!
>
> I have trouble to activate netns on OpenWrt with kernel 3.8.13.
>
> I get this:
>
> root@ROOter:~# ip netns show
> root@ROOter:~# ip netns add blue
> Failed to create a new network namespace "blue": Invalid argument
> root@ROOter:~# df
> Filesystem           1K-blocks      Used Available Use% Mounted on
> rootfs                   48377     10493     37884  22% /
> /dev/root                48377     10493     37884  22% /
> tmpfs                   257036      2264    254772   1% /tmp
> tmpfs                      512         0       512   0% /dev
> /dev/sda2                 4088      2266      1618  58% /mnt
> /dev/sda1                 4088      2266      1618  58% /mnt
> tmpfs                   257036      2264    254772   1% /tmp/run/netns
> root@ROOter:~# uname -a
> Linux ROOter 3.8.13 #2 Wed Mar 26 21:39:04 CET 2014 i686 GNU/Linux
> root@ROOter:~#
>
>
> Any hints on what I'm missing?
Trivial question: are you sure that CONFIG_NET_NS is set?


Regards,
Nicolas

Re: Activate netns

[Eric Dumazet]

On Thu, 2014-03-27 at 15:51 +0100, Peter Fassberg wrote:
> Hi!
> 
> I have trouble to activate netns on OpenWrt with kernel 3.8.13.
> 
> I get this:
> 
> root@ROOter:~# ip netns show
> root@ROOter:~# ip netns add blue
> Failed to create a new network namespace "blue": Invalid argument
> root@ROOter:~# df
> Filesystem           1K-blocks      Used Available Use% Mounted on
> rootfs                   48377     10493     37884  22% /
> /dev/root                48377     10493     37884  22% /
> tmpfs                   257036      2264    254772   1% /tmp
> tmpfs                      512         0       512   0% /dev
> /dev/sda2                 4088      2266      1618  58% /mnt
> /dev/sda1                 4088      2266      1618  58% /mnt
> tmpfs                   257036      2264    254772   1% /tmp/run/netns
> root@ROOter:~# uname -a
> Linux ROOter 3.8.13 #2 Wed Mar 26 21:39:04 CET 2014 i686 GNU/Linux
> root@ROOter:~#
> 
> 
> Any hints on what I'm missing?
> 

Are you sure kernel was compiled with netns support ?

CONFIG_NET_NS=y

Re: Activate netns

[Cong Wang]

On Thu, Mar 27, 2014 at 7:51 AM, Peter Fassberg <pf@leissner.se> wrote:
>
> Hi!
>
> I have trouble to activate netns on OpenWrt with kernel 3.8.13.
>
> I get this:
>
> root@ROOter:~# ip netns show
> root@ROOter:~# ip netns add blue
> Failed to create a new network namespace "blue": Invalid argument

Basically, `ip netns add blue` creates a file named "blue" in /var/run/netns/
and then binds mount it with /proc/self/ns/net so that this netns could
be held outside.

Try to strace ip netns add to see if setns() fails, which is likely caused
by the lack of netns support of your kernel.

Re: Activate netns

[Peter Fassberg]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 1454 bytes --]


On Thu, 27 Mar 2014, Nicolas Dichtel wrote:

> Le 27/03/2014 15:51, Peter Fassberg a écrit :
>> 
>> Hi!
>> 
>> I have trouble to activate netns on OpenWrt with kernel 3.8.13.
>> 
>> I get this:
>> 
>> root@ROOter:~# ip netns show
>> root@ROOter:~# ip netns add blue
>> Failed to create a new network namespace "blue": Invalid argument
>> root@ROOter:~# df
>> Filesystem           1K-blocks      Used Available Use% Mounted on
>> rootfs                   48377     10493     37884  22% /
>> /dev/root                48377     10493     37884  22% /
>> tmpfs                   257036      2264    254772   1% /tmp
>> tmpfs                      512         0       512   0% /dev
>> /dev/sda2                 4088      2266      1618  58% /mnt
>> /dev/sda1                 4088      2266      1618  58% /mnt
>> tmpfs                   257036      2264    254772   1% /tmp/run/netns
>> root@ROOter:~# uname -a
>> Linux ROOter 3.8.13 #2 Wed Mar 26 21:39:04 CET 2014 i686 GNU/Linux
>> root@ROOter:~#
>> 
>> 
>> Any hints on what I'm missing?
> Trivial question: are you sure that CONFIG_NET_NS is set?

That was my first question, and I double-checked the menuconfig *GUI*, and it was all fine, "<*>".

But now I have also checked the .config file, and there was no trace of CONFIG_KERNEL_NET_NS.

I made a clean checkout and did a new try - and it all worked!!

The config must have been messed up at some point.

Thank you for your time!

Sorry.



// Peter