libvirt users - Dec 2013 - Re: Question about setns recognising in libvirt autoconf

Hi experts,

When I test lxc container with lxc-enter-namespace command, It reported an error
as
following:
root@debian:~/github/libvirt# vir lxc-enter-namespace lxc --noseclabel /bin/df
-hl
error: Cannot get namespaces for 3145: Function not implemented

It seems that setns is not supported by my kernel.

But from the following info, It seemed the reason is just libvirt/autoconf
doesn't
recgonise setns.
root@debian:~/github/libvirt# grep setns /proc/kallsyms
ffffffff8105b78b T SyS_setns
ffffffff8105b78b T sys_setns
root@debian:~/github/libvirt# ./configure | grep setns
checking for setns... no

What the problem really is ? How can I fix this problem?
Thanks~

------------------     
Best regards!
GuanQiang

2013-12-09

On 12/09/2013 01:06 PM, hzguanqiang@corp.netease.com
wrote:
> Hi experts,
>  
> When I test lxc container with lxc-enter-namespace command, It reported an
error as
> following:
> root@debian:~/github/libvirt# vir lxc-enter-namespace lxc --noseclabel
/bin/df -hl
> error: Cannot get namespaces for 3145: Function not implemented
>  
> It seems that setns is not supported by my kernel.
>  
> But from the following info, It seemed the reason is just libvirt/autoconf
doesn't
> recgonise setns.
> root@debian:~/github/libvirt# grep setns /proc/kallsyms
> ffffffff8105b78b T SyS_setns
> ffffffff8105b78b T sys_setns
> root@debian:~/github/libvirt# ./configure | grep setns
> checking for setns... no
>  
> What the problem really is ? How can I fix this problem?
What's the result of grep -R "setns" /usr/include/*

On 2013-12-09 13:18 , Gao feng wrote:
On 12/09/2013 01:06 PM, hzguanqiang@corp.netease.com
wrote:
> Hi experts,
>  
> When I test lxc container with lxc-enter-namespace command, It reported an
error as
> following:
> root@debian:~/github/libvirt# vir lxc-enter-namespace lxc --noseclabel
/bin/df -hl
> error: Cannot get namespaces for 3145: Function not implemented
>  
> It seems that setns is not supported by my kernel.
>  
> But from the following info, It seemed the reason is just libvirt/autoconf
doesn't
> recgonise setns.
> root@debian:~/github/libvirt# grep setns /proc/kallsyms
> ffffffff8105b78b T SyS_setns
> ffffffff8105b78b T sys_setns
> root@debian:~/github/libvirt# ./configure | grep setns
> checking for setns... no
>  
> What the problem really is ? How can I fix this problem?
What's the result of grep -R "setns" /usr/include/*


Hi Gaofeng,
The result you want is as following:

root@debian:~/github/libvirt# grep -R "setns" /usr/include/*
/usr/include/asm-generic/unistd.h:#define __NR_setns 268
/usr/include/asm-generic/unistd.h:__SYSCALL(__NR_setns, sys_setns)
/usr/include/x86_64-linux-gnu/bits/syscall.h:#define SYS_setns __NR_setns
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:#define __NR_setns                
308
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:__SYSCALL(__NR_setns, sys_setns)
/usr/include/x86_64-linux-gnu/asm/unistd_32.h:#define __NR_setns               
346

------------------     
Best regards!
GuanQiang
13:21:12