使用virt-manage启动虚拟机时报错：libvirtError: Requested operation is not valid: network 'default' is not active
详情如下：
动域时出错: Requested operation is not valid: network 'default' is not active
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 88, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 124, in tmpcb
callback(*args, **kwargs)
File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 83, in newfn
ret = fn(self, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/domain.py", line 1404, in startup
self._backend.create()
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1035, in create
if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: Requested operation is not valid: network 'default' is not active
原因：
zdb@kylin-PC:~$ sudo virsh net-list --all
Name State Autostart Persistent
----------------------------------------------------------
default inactive no yes
default网络没有自启动，导致出错。
解决办法：
zdb@kylin-PC:~$ sudo virsh net-start default
Network default started
zdb@kylin-PC:~$ sudo virsh net-autostart default
Network default marked as autostarted
