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  VMware virtual machines to install virt-manager unable to connect to libvirt's approach
     
  Add Date : 2018-11-21      
         
         
         
  RHEL7.0 after installation is complete virt-manager, start the service process libvirtd

[Root @ demo Desktop] # systemctl enable libvirtd
[Root @ demo Desktop] # systemctl start libvirtd

When using virt-manager command to start the virtual machine management software, prompt unable to connect to libvirt

Unable to connect to libvirt.
 
no connection driver available for qemu: /// system
 
Libvirt URI is: qemu: /// system
 
Traceback (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

See libvirtd status

[Root @ demo Desktop] # systemctl status libvirtd
libvirtd.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.org
 Main PID: 9837 (libvirtd)
  CGroup: /system.slice/libvirtd.service
          9837 / usr / sbin / libvirtd
 
Aug 31 21:27:48 demo.example.com libvirtd [9837]: libvirt version: 1.2.8, package: 16.el7_1.3 (CentOS BuildSystem Aug 31 21:27:48 demo.example.com libvirtd [9837]: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_storage...ference
Aug 31 21:27:48 demo.example.com libvirtd [9837]: failed to load module /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so...eCreate
Aug 31 21:27:48 demo.example.com libvirtd [9837]: Module /usr/lib64/libvirt/connection-driver/libvirt_driver_lxc.so not accessible
Aug 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: /// system
Aug 31 21:29:14 demo.example.com libvirtd [9837]: End of file while reading data: Input / output error
Hint: Some lines were ellipsized, use -l to show in full.

This time may be a problem with the driver installation, updated device-mapper package

[Root @ demo Desktop] # yum update device-mapper

Restart libvirtd Service

[Root @ demo Desktop] # systemctl restart libvirtd
[Root @ demo Desktop] # systemctl status libvirtd
libvirtd.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.org
 Main 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_leaseshelper
 
Aug 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 150
Aug 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 auth
Aug 31 21:34:26 demo.example.com dnsmasq-dhcp [10185]: DHCP, IP range 192.168.122.2 - 192.168.122.254, lease time 1h
Aug 31 21:34:26 demo.example.com dnsmasq [10185]: reading /etc/resolv.conf
Aug 31 21:34:26 demo.example.com dnsmasq [10185]: using nameserver 202.103.44.150 # 53
Aug 31 21:34:26 demo.example.com dnsmasq [10185]: using nameserver 202.103.24.68 # 53
Aug 31 21:34:26 demo.example.com dnsmasq [10185]: read / etc / hosts - 4 addresses
Aug 31 21:34:26 demo.example.com dnsmasq [10185]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Aug 31 21:34:26 demo.example.com dnsmasq-dhcp [10185]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Hint: Some lines were ellipsized, use -l to show in full.

At this time libvirtd services appear as normal, there was no error, run the virt-manager again, can be connected to normal
     
         
         
         
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