Monday, December 13, 2010

ERROR unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused

Please ensure all these steps are done first. We can then isolate the error more accurately. The 1st few steps are taken from HowtoForge Virtualization With KVM On A CentOS 5.2 Server

Step 1: Checking the Virtualisation Technology on AMD and Intel

Step 2: Install KVM and virtinst
# yum install  kvm kmod-kvm qemu libvirt python-virtinst
Step 3: Reboot the System
# shutdown -r now
Step 4: Check that the KVM kernel Module is loaded
# lsmod grep kvm

kvm_intel     50452      0
kvm           109264     1 kvm_intel
(If you use Intel VT CPU, you should see the above, if you are using AMD-V processor, you should see kvm_amd)

When installing KVM and its related components on CentOS 5.x , you might encounter the error when you type the command "# virt-install"
ERROR unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused
Traceback (most recent call last):
   File "/usr/sbin/virt-install", line 889, in ?
   File "/usr/sbin/virt-install", line 628, in main
      conn = cli.getConnection(options.connect)
   File "/usr/lib/python2.4/site-packages/virtinst/", line 126, in getConnction
      conn =
   File "/usr/lib64/python2.4/site-packages/", line 159, in open
     if ret is None:raise libvirtError('virConnectOpen() failed')
libvirtError: unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused
To solve this, edit /etc/libvirt/libvirtd.conf and
# vim /etc/libvirt/libvirtd.conf
uncommented out the listen_tls = 0 line
listen_tls = 0
Start the libvirtd Daemon
# service libvirtd start

You should able to eliminate the error

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