# Revision history [back]

### Nova generated an error : libvirtError : unable to create cgroup for instance : no such file or directory [on hold]

When i did some operations which restart VM , create VM or resume VM from susppend status , then i got some error information about libvirt.

The error log is here:

File  "/usr/lib/python2.7/dist-packages/libvirt.py", line 711, in createWithFalgs
if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed' , don=self)
libvirtError : unable to create cgroup for instance : no such file or directory



so, you can see that libvirtError: Unable to create cgroup for instance error. I think that the cgroup files should be deleted by upstart or systemd.I also search related discussion about this issue. it's said that the error is upstart or systemd bug. But i am not sure about it. Then I wonder the real reason for this issue, and how to resolve it. if anyone know that, please let me know.

### Nova generated an error : libvirtError : unable to create cgroup for instance : no such file or directory [on hold]

When i did some operations which restart VM , create VM or resume VM from susppend status , then i got some error information about libvirt.

The error log is here:

File  "/usr/lib/python2.7/dist-packages/libvirt.py", line 711, in createWithFalgs
if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed' , don=self)
libvirtError : unable to create cgroup for instance : no such file or directory



so, you can see that libvirtError: Unable to create cgroup for instance error. I think that the cgroup files should be deleted by upstart or systemd.I also search related discussion about this issue. it's said that the error is upstart or systemd bug. But i am not sure about it. Then I wonder the real reason for this issue, and how to resolve it. if anyone know that, please let me know.