一、在Virtual Machine Manager中启动系统时报错：
cannot send monitor command '{"execute":"qmp_capabilities"}': Connection reset by peer
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/engine.py", line 956, in asyncfunc
vm.startup()
File "/usr/share/virt-manager/virtManager/domain.py", line 1048, in startup
self._backend.create()
File "/usr/lib64/python2.6/site-packages/libvirt.py", line 325, in create
if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: cannot send monitor command '{"execute":"qmp_capabilities"}': Connection reset by peer
解决办法：
1) Remove any snapshot available
# rm -f /var/lib/libvirt/qemu/save/my-virtual-machine-name
2) restart libvirtd
# service libvirtd restart
3) Start the virtual machine again
二、在普通用户登陆的情况下，打开虚拟机可能也会报错，有可能遇到的问题是：libvirtd这个服务未启动
解决办法：
1）su root
2）service libvirtd start
3）chkconfig libvirtd on （设置为开机自启动）
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