RHEL7.0在安装完成virt-manager后，启动libvirtd服务进程
[root@demo Desktop]# systemctl enable libvirtd[root@demo Desktop]# systemctl start libvirtd
在使用virt-manager命令启动虚拟机管理软件时，提示unable to connect to libvirt
Unable to connect to libvirt.no connection driver available for qemu:///systemLibvirt URI is: qemu:///systemTraceback (most recent call last): File “/usr/share/virt-manager/virtManager/connection.py”, line 969, in _open_thread self._backend.open(self._do_creds_password) File “/usr/share/virt-manager/virtinst/connection.py”, line 157, in open open_flags) File “/usr/lib64/python2.7/site-packages/libvirt.py”, line 105, in openAuth if ret is None:raise libvirtError(‘virConnectOpenAuth() failed’)libvirtError: no connection driver available for qemu:///system
查看libvirtd的状态
[root@demo Desktop]# systemctl status libvirtdlibvirtd.service – Virtualization daemon Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled) Active: active (running) since Mon 2015-08-31 21:27:48 CST; 4min 47s ago Docs: man:libvirtd(8) http://libvirt.orgMain PID: 9837 (libvirtd) CGroup: /system.slice/libvirtd.service └─9837 /usr/sbin/libvirtdAug 31 21:27:48 demo.example.com libvirtd[9837]: libvirt version: 1.2.8, package: 16.el7_1.3 (CentOS BuildSystem <http://bugs.cent…os.org)Aug 31 21:27:48 demo.example.com libvirtd[9837]: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_storage…ferenceAug 31 21:27:48 demo.example.com libvirtd[9837]: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so…eCreateAug 31 21:27:48 demo.example.com libvirtd[9837]: Module /usr/lib64/libvirt/connection-driver/libvirt_driver_lxc.so not accessibleAug 31 21:27:48 demo.example.com systemd[1]: Started Virtualization daemon.Aug 31 21:28:19 demo.example.com systemd[1]: Started Virtualization daemon.Aug 31 21:29:14 demo.example.com libvirtd[9837]: no connection driver available for qemu:///systemAug 31 21:29:14 demo.example.com libvirtd[9837]: End of file while reading data: Input/output errorHint: Some lines were ellipsized, use -l to show in full.
此时可能是驱动程序的安装有问题，更新device-mapper包
[root@demo Desktop]# yum update device-mapper
重启libvirtd服务
[root@demo Desktop]# systemctl restart libvirtd[root@demo Desktop]# systemctl status libvirtdlibvirtd.service – Virtualization daemon Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled) Active: active (running) since Mon 2015-08-31 21:34:23 CST; 7s ago Docs: man:libvirtd(8) http://libvirt.orgMain PID: 10082 (libvirtd) CGroup: /system.slice/libvirtd.service ├─10082 /usr/sbin/libvirtd ├─10185 /sbin/dnsmasq –conf-file=/var/lib/libvirt/dnsmasq/default.conf –dhcp-script=/usr/libexec/libvirt_leaseshelper └─10186 /sbin/dnsmasq –conf-file=/var/lib/libvirt/dnsmasq/default.conf –dhcp-script=/usr/libexec/libvirt_leaseshelperAug 31 21:34:23 demo.example.com systemd[1]: Started Virtualization daemon.Aug 31 21:34:26 demo.example.com dnsmasq[10185]: started, version 2.66 cachesize 150Aug 31 21:34:26 demo.example.com dnsmasq[10185]: compile time options: IPv6 GNU-getopt DBus no-i18n IDN DHCP DHCPv6 no-Lua TFTP no…et authAug 31 21:34:26 demo.example.com dnsmasq-dhcp[10185]: DHCP, IP range 192.168.122.2 — 192.168.122.254, lease time 1hAug 31 21:34:26 demo.example.com dnsmasq[10185]: reading /etc/resolv.confAug 31 21:34:26 demo.example.com dnsmasq[10185]: using nameserver 202.103.44.150#53Aug 31 21:34:26 demo.example.com dnsmasq[10185]: using nameserver 202.103.24.68#53Aug 31 21:34:26 demo.example.com dnsmasq[10185]: read /etc/hosts – 4 addressesAug 31 21:34:26 demo.example.com dnsmasq[10185]: read /var/lib/libvirt/dnsmasq/default.addnhosts – 0 addressesAug 31 21:34:26 demo.example.com dnsmasq-dhcp[10185]: read /var/lib/libvirt/dnsmasq/default.hostsfileHint: Some lines were ellipsized, use -l to show in full.
此时libvirtd服务显示为正常，没有出现报错，再次运行virt-manager，可以正常连接
世界会向那些有目标和远见的人让路(冯两努–香港着名推销商
