Possible issues and bug fixes: Some errors in running libvirtd may arise when using CentOS 6. The problem can be solved by adding the following code to /etc/cgconfig.conf:

group virt { cpu { cpu.shares = 9216; } }

After entering the code, restart /etc/init.d/cgconfig and launch libvirtd.

Using the console on a website may also cause some problems. One of them is that the vnc uses 127.0.0.1 as the default address for the hosts. To check this, execute the following command:

netstat -nlp | grep kvmtcp        0      0 0.0.0.0:5900                0.0.0.0:*                   LISTEN      11673/qemu-kvmtcp        0      0 0.0.0.0:5901                0.0.0.0:*                   LISTEN      11872/qemu-kvmtcp        0      0 0.0.0.0:5902                0.0.0.0:*                   LISTEN      15227/qemu-kvmtcp        0      0 0.0.0.0:5903                0.0.0.0:*                   LISTEN      12587/qemu-kvm