Load-balancing and scaling of cloud resources by migrating a data session

摘要

A method, in a virtualized system comprising multiple virtual machine (VM) instances executing over physical hardware, for migrating a data session from a first VM to a second VM, the method comprising modifying a routing rule of a load balancer of the system, the rule representing at least one parameter for communications between a client device and the first VM to specify that data from the client device destined for the first VM instance is queued, suspending processing, at the first VM instance, of pending requests from the client device, transmitting data, from the first VM instance, to the load balancer representing the state of the or each suspended request, modifying the routing rule to specify that the endpoint for a communication channel from the second VM instance is the client device, transmitting the or each suspended request to the second VM instance, and modifying the routing rule to specify transmission of data from the client device directly to the second VM instance.