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

[hzguanqiang at corp.netease.com]

On 2013-11-14 16:40 , Gao feng wrote:
On 11/14/2013 03:09 PM, hzguanqiang at corp.netease.com wrote:
> On 2013-11-14 15:03 , Gao feng <mailto:gaofeng at cn.fujitsu.com> wrote:
> 
>     On 11/14/2013 02:57 PM, hzguanqiang at corp.netease.com wrote:
>     > On 2013-11-14 14:17 , Gao feng <mailto:gaofeng at cn.fujitsu.com> 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:~$> vir lxc-enter-namespace 1544 --noseclabel /bin/df -hl
>     >     >     error: Cannot get namespaces for 1545: Function not implemented
>     >     > The instance id is 1544, but the error info hint cannot get ns for 1545.
>     >     >
>     >     
>     >     we have two libvirt lxc related process at the first start,
>     >     one is controller process on host(pid 1544), the other is the container's init task(pid 1545).
>     >     since lxc-enter-namespace wants to exec cmd in container environment. so
>     >     libvirt will try to get the namespaces of container's init task.
>     >     
>     >     The problem is libvirt/autoconf thinks your system doesn't support setns system call...
>     >     
>     >     > The libvirt code of mine is of version 1.1.4 from github (git checkout v1.1.4 -b stable1.1.4 )
>     >     >
>     >     
>     >     I don't know if the libvirt git repo on github is the right thing, but As I know
>     >     this repo git://libvirt.org/libvirt.git is official.
>     >     
>     >     Please have a try.
>     >     
>     >     
>     >     Thanks
>     >
>     > 
>     > Sorry, I made a mistake about the libvirt repo, the code I used is just from the official repo.
>     > Maybe it's problem of my kernel. I've tried to build libvirt from code of master branch. The
>     > mistake is just the same.
>     > 
>      
>     what's result of "./configure | grep setns"
>      
> 
>  
> 
> The result is:
>   hzguanqiang at debian:~/github/libvirt$ <mailto:hzguanqiang at debian:~/github/libvirt$> ./configure | grep setns
>   checking for setns... no
>  
> Is there something need to configure for setns system call? Or something is wrong with my kernel?
>  

Seem your kernel has setns, but autoconf doesn't recognise it.
you can modify the config.h, change as below
#define HAVE_SETNS 1
and make && make install


Hi gaofeng,
I tried as you said, but it report an error when do make operation as following:

util/virprocess.c: In function 'virProcessSetNamespaces':
util/virprocess.c:568:9: error: implicit declaration of function 'setns' [-Werror=implicit-function-declaration]
util/virprocess.c:568:9: error: nested extern declaration of 'setns' [-Werror=nested-externs]
cc1: all warnings being treated as errors
make[3]: *** [util/libvirt_util_la-virprocess.lo] Error 1

I think something must be wrong about setns system call in my environment.
But still thanks very much for your help.

------------------     
Best regards!
GuanQiang
17:34:55
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20131114/bf46ae5f/attachment.htm>