[one-users] Failed to acquire pid file '/var/run/libvirtd.pid': Resource temporarily unavailable - error when run /usr/sbin/libvirtd start

[Qiubo Su (David Su)]

dear opennebula community,

recently in one single PC (with ubuntu 12.04 64 bits server as OS), i
installed/configured a Cloud system with OpenNebula 3.6.0. The Hypervisor
is KVM. But when run /usr/sbin/libvirtd start, got below error:

2012-10-31 04:30:47.283+0000: 20014: info : libvirt version: 0.9.8
2012-10-31 04:30:47.283+0000: 20014: error : virPidFileAcquirePath:345 :
Failed to acquire pid file '/var/run/libvirtd.pid': Resource temporarily
unavailable

it looks like the the libvirt daemon doesn't work. it is much appreciated
if anyone can help with this.

moreover, a long time before setted up the Cloud system, in the same PC i
have Oracle VirtualBox installed and several VM OS instances created under
VirtualBox. the operation of these VM instances are fine.

the user:group of Oracle VirtualBox and its VM instances is different from
that for the Cloud system (includes openebula, kvm, libvirt etc)

is it ok to have two VM hosts installed in the same PC, as described above?
could this cause the above error when run /usr/sbin/libvirtd start.

thanks for your hep.

thanks,
david su
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