[libvirt-users] libvirt 1.0.3 Vs 1.0.4 / cgroup devices

[Mohamed Larabi]

Hi there, 


I am using libvirt with lxc to create fedora 16 & 18 containers on fedora 18 host. 


first I did the setup with libvirt 1.0.3 and everything worked fine, then after upgrading to libvirt 1.0.4, I could not create character device on the guests : 


Test on the guest1 : 


# ls -l /dev 
total 0 
lrwxrwxrwx. 1 root root 10 Apr 17 21:18 console -> /dev/pts/0 
lrwxrwxrwx. 1 root root 11 Apr 17 21:18 core -> /proc/kcore 
lrwxrwxrwx. 1 root root 13 Apr 17 21:18 fd -> /proc/self/fd 
crw-rw-rw-. 1 root root 1, 7 Apr 17 21:18 full 
drwxr-xr-x. 2 root root 0 Apr 17 21:18 hugepages 
prw-------. 1 root root 0 Apr 17 21:18 initctl 
srw-rw-rw-. 1 root root 0 Apr 17 21:18 log 
drwxrwxrwt. 2 root root 40 Apr 17 21:18 mqueue 
crw-rw-rw-. 1 root root 1, 3 Apr 17 21:18 null 
crw-rw-rw-. 1 root root 5, 2 Apr 18 10:31 ptmx 
drwxr-xr-x. 2 root root 0 Apr 17 21:18 pts 
crw-r--r--. 1 root root 1, 8 Apr 17 21:19 random 
drwxrwxrwt. 2 root root 40 Apr 17 21:18 shm 
lrwxrwxrwx. 1 root root 15 Apr 17 21:18 stderr -> /proc/self/fd/2 
lrwxrwxrwx. 1 root root 15 Apr 17 21:18 stdin -> /proc/self/fd/0 
lrwxrwxrwx. 1 root root 15 Apr 17 21:18 stdout -> /proc/self/fd/1 
lrwxrwxrwx. 1 root root 10 Apr 17 21:18 tty1 -> /dev/pts/0 
crw-rw-rw-. 1 root root 1, 9 Apr 17 21:18 urandom 
crw-rw-rw-. 1 root root 1, 5 Apr 17 21:18 zero 


# rm -f /dev/random (successful) 


# mknod random c 1 8 
mknod: `random': Operation not permitted 



Config on the host : 


knowing that selinux is set to permissive and c 1:8 rwm is in the cgroup devices list of the guest1 


# cat /sys/fs/cgroup/devices/ libvirt/lxc/guest1/devices. list 

c 1:3 rwm 
c 1:5 rwm 
c 1:7 rwm 
c 1:8 rwm 
c 1:9 rwm 
c 5:0 rwm 
c 5:2 rwm 
c 10:229 rwm 
c 136:* rwm 


is this a change that was introduced intentially on 1.0.4 ? if yes, how can I make it work ? 


please advice 


Thank you in advance 


Mohamed 
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