[libvirt-users] Problem about lxc-enter-namespace interface

[hzguanqiang at corp.netease.com]

On 2013-11-14 14:17 , Gao feng wrote:
On 11/14/2013 01:52 PM, hzguanqiang at corp.netease.com wrote:
> On 2013-11-14 13:41 , Gao feng <mailto:gaofeng at cn.fujitsu.com> wrote:
> 
>     On 11/14/2013 01:24 PM, Gao feng wrote:
>     > On 11/14/2013 10:59 AM, hzguanqiang at corp.netease.com wrote:
>     >> Hi experts,
>     >> 
>     >> When I test lxc-enter-namespace interface, it turned out such an error:
>     >> 
>     >> hzguanqiang at debian:~$ <mailto:hzguanqiang at debian:~$> vir version
>     >> Compiled against library: libvirt 1.1.4
>     >> Using library: libvirt 1.1.4
>     >> Using API: LXC 1.1.4
>     >> Running hypervisor: LXC 3.9.6
>     >> 
>     >> hzguanqiang at debian:~$ <mailto:hzguanqiang at debian:~$> vir list
>     >> Id    Name                           State
>     >> ----------------------------------------------------
>     >> 1544  instance-00000015              running
>     >> 
>     >> hzguanqiang at debian:~$ <mailto:hzguanqiang at debian:~$> vir lxc-enter-namespace 1544 --noseclabel /bin/df -hl
>     >> error: Cannot get namespaces for 1545: Function not implemented
>     >> 
>     >> hzguanqiang at debian:~$ <mailto:hzguanqiang at debian:~$> ls /proc/self/ns
>     >> ipc  mnt  net  pid  user  uts
>     >> 
>     >> What's the problem?
>     >> 
>     >
>     > Does your system have system call setns?
>      
>     grep setns /proc/kallsyms
>     and
>     grep setns the config.log of libvirt.
>      
> 
> Hi, Gaofeng, thanks for your help. The info you want are:
>  

Hi,

> hzguanqiang at debian:~/github/libvirt$ <mailto:hzguanqiang at debian:~/github/libvirt$> sudo grep setns /var/log/libvirt/libvirtd.log

config.log not libvirtd.log, or you can exec "./configure | grep setns" under libvirt source directory.

> hzguanqiang at debian:~/github/libvirt$ <mailto:hzguanqiang at debian:~/github/libvirt$> grep setns /proc/kallsyms
> ffffffff8105b993 T sys_setns
>  
> What I found really strange is that the error info returned by the command.
>     hzguanqiang at debian:~$ <mailto:hzguanqiang at debian:~$> vir lxc-enter-namespace 1544 --noseclabel /bin/df -hl
>     error: Cannot get namespaces for 1545: Function not implemented
> The instance id is 1544, but the error info hint cannot get ns for 1545.
>  

we have two libvirt lxc related process at the first start,
one is controller process on host(pid 1544), the other is the container's init task(pid 1545).
since lxc-enter-namespace wants to exec cmd in container environment. so
libvirt will try to get the namespaces of container's init task.

The problem is libvirt/autoconf thinks your system doesn't support setns system call...

> The libvirt code of mine is of version 1.1.4 from github (git checkout v1.1.4 -b stable1.1.4 )
>  

I don't know if the libvirt git repo on github is the right thing, but As I know
this repo git://libvirt.org/libvirt.git is official.

Please have a try.


Thanks


Sorry, I made a mistake about the libvirt repo, the code I used is just from the official repo.
Maybe it's problem of my kernel. I've tried to build libvirt from code of master branch. The
mistake is just the same.

------------------     
Best regards!
GuanQiang
14:52:30
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20131114/35102ffb/attachment.htm>