Hello. I'm quite new at Openstack and I've used it for few weeks. I'm trying to log host stats(cpu, memory, network, disk) by nova-instancemonitor service. Everything works fine...but after 1 minute (without any warning) I get an error. Same error coming from libvirt.

(nova): TRACE: Traceback (most recent call last): (nova): TRACE: File "/usr/local/bin/nova-instancemonitor", line 5, in <module> (nova): TRACE: pkg_resources.run_script('nova==2011.2', 'nova-instancemonitor') (nova): TRACE: File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 461, in run_script (nova): TRACE: self.require(requires)[0].run_script(script_name, ns) (nova): TRACE: File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 1194, in run_script (nova): TRACE: execfile(script_filename, namespace, namespace) (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/EGG-INFO/scripts/nova-instancemonitor", line 49, in <module> (nova): TRACE: twistd.serve(__file__) (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/nova/twistd.py", line 267, in serve (nova): TRACE: twistd.runApp(options) (nova): TRACE: File "/usr/lib/python2.6/dist-packages/twisted/scripts/twistd.py", line 23, in runApp (nova): TRACE: _SomeApplicationRunner(config).run() (nova): TRACE: File "/usr/lib/python2.6/dist-packages/twisted/application/app.py", line 423, in run (nova): TRACE: self.postApplication() (nova): TRACE: File "/usr/lib/python2.6/dist-packages/twisted/scripts/_twistd_unix.py", line 205, in postApplication (nova): TRACE: self.startApplication(self.application) (nova): TRACE: File "/usr/lib/python2.6/dist-packages/twisted/scripts/_twistd_unix.py", line 317, in startApplication (nova): TRACE: app.startApplication(application, not self.config['no_save']) (nova): TRACE: File "/usr/lib/python2.6/dist-packages/twisted/application/app.py", line 713, in startApplication (nova): TRACE: service.IService(application).startService() (nova): TRACE: File "/usr/lib/python2.6/dist-packages/twisted/application/service.py", line 278, in startService (nova): TRACE: service.startService() (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/nova/compute/monitor.py", line 416, in startService (nova): TRACE: self.updateInstances() (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/nova/compute/monitor.py", line 439, in updateInstances (nova): TRACE: domain_ids = conn.list_instances() (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/nova/virt/libvirt_conn.py", line 286, in list_instances (nova): TRACE: for x in self._conn.listDomainsID()] (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/nova/virt/libvirt_conn.py", line 248, in _get_connection (nova): TRACE: self.read_only) (nova): TRACE: File "/usr/local/lib/python2.6/dist-packages/nova-2011.2-py2.6.egg/nova/virt/libvirt_conn.py", line 280, in _connect (nova): TRACE: return libvirt.openReadOnly(uri) (nova): TRACE: File "/usr/lib/python2.6/dist-packages/libvirt.py", line 176, in openReadOnly (nova): TRACE: if ret is None:raise libvirtError('virConnectOpenReadOnly() failed') (nova): TRACE: libvirtError: cannot send data: Broken pipe (nova): TRACE:

It's very strange as the service during this activity connects to libvirt many times without any problem for example: 2011-08-21 22:39:42,719 DEBUG nova.virt.libvirt_conn [-] Connecting to libvirt: qemu:///system from (pid=2061 ... (more)