Error communicating with http://192.168.1.2:9292 [Errno 111] ECONNREFUSED

Some times, when you trying to deploy a machine, you may ended up with the following error. In my case, the infrastructure is as follows. One Controller Node, Two compute Nodes, One cinder and One Neutron node. All are Centos 6.6 with Icehouse Release. 2013-10-30 12:34:03.574 15487 TRACE nova.api.openstack CommunicationError: Error communicating with http://192.168.1.2:9292 [Errno…

Over-committing and Ballooning with KVM

Over-Committing the resource is a vital part in Virtualization. Idea of over-committment is to allocate more memory to guest machines than the host really has. Suppose a 2GB host is running two guest operating system who is having 2GB memory, in this case we can say its over committed. In Ballooning process, Host have a…