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

On 2013-11-14 16:40 , Gao feng <mailto:gaofeng@cn.fujitsu.com> wrote: On 11/14/2013 03:09 PM, hzguanqiang(a)corp.netease.com wrote: > On 2013-11-14 15:03 , Gao feng <mailto:gaofeng@cn.fujitsu.com> wrote: > > On 11/14/2013 02:57 PM, hzguanqiang(a)corp.netease.com wrote: > > On 2013-11-14 14:17 , Gao feng <mailto:gaofeng@cn.fujitsu.com> wrote: > > > > On 11/14/2013 01:52 PM, hzguanqiang(a)corp.netease.com wrote: > > > On 2013-11-14 13:41 , Gao feng <mailto:gaofeng@cn.fujitsu.com> wrote: > > > > > > On 11/14/2013 01:24 PM, Gao feng wrote: > > > > On 11/14/2013 10:59 AM, hzguanqiang(a)corp.netease.com wrote: > > > >> Hi experts, > > > >> > > > >> When I test lxc-enter-namespace interface, it turned out such an error: > > > >> > > > >> hzguanqiang@debian:~$ <mailto:hzguanqiang@debian:~$> vir version > > > >> Compiled against library: libvirt 1.1.4 > > > >> Using library: libvirt 1.1.4 > > > >> Using API: LXC 1.1.4 > > > >> Running hypervisor: LXC 3.9.6 > > > >> > > > >> hzguanqiang@debian:~$ <mailto:hzguanqiang@debian:~$> vir list > > > >> Id Name State > > > >> ---------------------------------------------------- > > > >> 1544 instance-00000015 running > > > >> > > > >> hzguanqiang@debian:~$ <mailto:hzguanqiang@debian:~$> vir lxc-enter-namespace 1544 --noseclabel /bin/df -hl > > > >> error: Cannot get namespaces for 1545: Function not implemented > > > >> > > > >> hzguanqiang@debian:~$ <mailto:hzguanqiang@debian:~$> ls /proc/self/ns > > > >> ipc mnt net pid user uts > > > >> > > > >> What's the problem? > > > >> > > > > > > > > Does your system have system call setns? > > > > > > grep setns /proc/kallsyms > > > and > > > grep setns the config.log of libvirt. > > > > > > > > > Hi, Gaofeng, thanks for your help. The info you want are: > > > > > > > Hi, > > > > > hzguanqiang@debian:~/github/libvirt$ <mailto:hzguanqiang@debian:~/github/libvirt$> sudo grep setns /var/log/libvirt/libvirtd.log > > > > config.log not libvirtd.log, or you can exec "./configure | grep setns" under libvirt source directory. > > > > > hzguanqiang@debian:~/github/libvirt$ <mailto:hzguanqiang@debian:~/github/libvirt$> grep setns /proc/kallsyms > > > ffffffff8105b993 T sys_setns > > > > > > What I found really strange is that the error info returned by the command. > > > hzguanqiang@debian:~$ <mailto:hzguanqiang@debian:~$> vir lxc-enter-namespace 1544 --noseclabel /bin/df -hl > > > error: Cannot get namespaces for 1545: Function not implemented > > > The instance id is 1544, but the error info hint cannot get ns for 1545. > > > > > > > we have two libvirt lxc related process at the first start, > > one is controller process on host(pid 1544), the other is the container's init task(pid 1545). > > since lxc-enter-namespace wants to exec cmd in container environment. so > > libvirt will try to get the namespaces of container's init task. > > > > The problem is libvirt/autoconf thinks your system doesn't support setns system call... > > > > > The libvirt code of mine is of version 1.1.4 from github (git checkout v1.1.4 -b stable1.1.4 ) > > > > > > > I don't know if the libvirt git repo on github is the right thing, but As I know > > this repo git://libvirt.org/libvirt.git is official. > > > > Please have a try. > > > > > > Thanks > > > > > > Sorry, I made a mistake about the libvirt repo, the code I used is just from the official repo. > > Maybe it's problem of my kernel. I've tried to build libvirt from code of master branch. The > > mistake is just the same. > > > > what's result of "./configure | grep setns" > > > > > The result is: > hzguanqiang@debian:~/github/libvirt$ <mailto:hzguanqiang@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.